TheCloud/panda3d
1
0
Fork 0
mirror of https://github.com/panda3d/panda3d.git synced 2025-10-04 02:42:49 -04:00
Code Issues Packages Projects Releases Wiki Activity
panda3d/panda/src/pgraphnodes/shaderGenerator.cxx

1444 lines
54 KiB
C++
Raw Blame History

// Filename: shaderGenerator.cxx
// Created by: jyelon (15Dec07)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University. All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license. You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////
#include "shaderGenerator.h"
#include "renderState.h"
#include "shaderAttrib.h"
#include "auxBitplaneAttrib.h"
#include "alphaTestAttrib.h"
#include "colorBlendAttrib.h"
#include "transparencyAttrib.h"
#include "textureAttrib.h"
#include "colorAttrib.h"
#include "lightAttrib.h"
#include "materialAttrib.h"
#include "lightRampAttrib.h"
#include "texMatrixAttrib.h"
#include "texGenAttrib.h"
#include "colorScaleAttrib.h"
#include "fogAttrib.h"
#include "texture.h"
#include "ambientLight.h"
#include "directionalLight.h"
#include "pointLight.h"
#include "spotlight.h"
#include "lightLensNode.h"
#include "lvector4.h"
TypeHandle ShaderGenerator::_type_handle;
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::Constructor
// Access: Published
// Description: Create a ShaderGenerator. This has no state,
// except possibly to cache certain results.
// The parameter that must be passed is the GSG to
// which the shader generator belongs.
////////////////////////////////////////////////////////////////////
ShaderGenerator::
ShaderGenerator(PT(GraphicsStateGuardianBase) gsg, PT(GraphicsOutputBase) host) :
_gsg (gsg), _host (host) {
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::Destructor
// Access: Published, Virtual
// Description: Destroy a ShaderGenerator.
////////////////////////////////////////////////////////////////////
ShaderGenerator::
~ShaderGenerator() {
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::reset_register_allocator
// Access: Protected
// Description: Clears the register allocator. Initially, the pool
// of available registers is empty. You have to add
// some if you want there to be any.
////////////////////////////////////////////////////////////////////
void ShaderGenerator::
reset_register_allocator() {
_vtregs_used = 0;
_vcregs_used = 0;
_ftregs_used = 0;
_fcregs_used = 0;
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::alloc_vreg
// Access: Protected
// Description: Allocate a vreg.
////////////////////////////////////////////////////////////////////
INLINE char *ShaderGenerator::
alloc_vreg() {
switch (_vtregs_used) {
case 0: _vtregs_used += 1; return (char*)"TEXCOORD0";
case 1: _vtregs_used += 1; return (char*)"TEXCOORD1";
case 2: _vtregs_used += 1; return (char*)"TEXCOORD2";
case 3: _vtregs_used += 1; return (char*)"TEXCOORD3";
case 4: _vtregs_used += 1; return (char*)"TEXCOORD4";
case 5: _vtregs_used += 1; return (char*)"TEXCOORD5";
case 6: _vtregs_used += 1; return (char*)"TEXCOORD6";
case 7: _vtregs_used += 1; return (char*)"TEXCOORD7";
}
switch (_vcregs_used) {
case 0: _vcregs_used += 1; return (char*)"COLOR0";
case 1: _vcregs_used += 1; return (char*)"COLOR1";
}
return (char*)"UNKNOWN";
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::alloc_freg
// Access: Protected
// Description: Allocate a freg.
////////////////////////////////////////////////////////////////////
INLINE char *ShaderGenerator::
alloc_freg() {
switch (_ftregs_used) {
case 0: _ftregs_used += 1; return (char*)"TEXCOORD0";
case 1: _ftregs_used += 1; return (char*)"TEXCOORD1";
case 2: _ftregs_used += 1; return (char*)"TEXCOORD2";
case 3: _ftregs_used += 1; return (char*)"TEXCOORD3";
case 4: _ftregs_used += 1; return (char*)"TEXCOORD4";
case 5: _ftregs_used += 1; return (char*)"TEXCOORD5";
case 6: _ftregs_used += 1; return (char*)"TEXCOORD6";
case 7: _ftregs_used += 1; return (char*)"TEXCOORD7";
}
switch (_fcregs_used) {
case 0: _fcregs_used += 1; return (char*)"COLOR0";
case 1: _fcregs_used += 1; return (char*)"COLOR1";
}
return (char*)"UNKNOWN";
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::analyze_renderstate
// Access: Protected
// Description: Analyzes the RenderState prior to shader generation.
// The results of the analysis are stored in instance
// variables of the Shader Generator.
////////////////////////////////////////////////////////////////////
void ShaderGenerator::
analyze_renderstate(const RenderState *rs) {
clear_analysis();
// verify_enforce_attrib_lock();
_state = rs;
const AuxBitplaneAttrib *aux_bitplane = DCAST(AuxBitplaneAttrib, rs->get_attrib_def(AuxBitplaneAttrib::get_class_slot()));
int outputs = aux_bitplane->get_outputs();
// Decide whether or not we need alpha testing or alpha blending.
const AlphaTestAttrib *alpha_test = DCAST(AlphaTestAttrib, rs->get_attrib_def(AlphaTestAttrib::get_class_slot()));
if ((alpha_test->get_mode() != RenderAttrib::M_none)&&
(alpha_test->get_mode() != RenderAttrib::M_always)) {
_have_alpha_test = true;
}
const ColorBlendAttrib *color_blend = DCAST(ColorBlendAttrib, rs->get_attrib_def(ColorBlendAttrib::get_class_slot()));
if (color_blend->get_mode() != ColorBlendAttrib::M_none) {
_have_alpha_blend = true;
}
const TransparencyAttrib *transparency = DCAST(TransparencyAttrib, rs->get_attrib_def(TransparencyAttrib::get_class_slot()));
if ((transparency->get_mode() == TransparencyAttrib::M_alpha)||
(transparency->get_mode() == TransparencyAttrib::M_dual)) {
_have_alpha_blend = true;
}
// Decide what to send to the framebuffer alpha, if anything.
if (outputs & AuxBitplaneAttrib::ABO_glow) {
if (_have_alpha_blend) {
_calc_primary_alpha = true;
_out_primary_glow = false;
_disable_alpha_write = true;
} else if (_have_alpha_test) {
_calc_primary_alpha = true;
_out_primary_glow = true;
_subsume_alpha_test = true;
} else {
_calc_primary_alpha = false;
_out_primary_glow = true;
}
} else {
if (_have_alpha_blend || _have_alpha_test) {
_calc_primary_alpha = true;
}
}
// Determine what to put into the aux bitplane.
_out_aux_normal = (outputs & AuxBitplaneAttrib::ABO_aux_normal) ? true:false;
_out_aux_glow = (outputs & AuxBitplaneAttrib::ABO_aux_glow) ? true:false;
_out_aux_any = (_out_aux_normal || _out_aux_glow);
if (_out_aux_normal) {
_need_eye_normal = true;
}
// Count number of textures.
const TextureAttrib *texture = DCAST(TextureAttrib, rs->get_attrib_def(TextureAttrib::get_class_slot()));
_num_textures = texture->get_num_on_stages();
// Determine whether or not vertex colors or flat colors are present.
const ColorAttrib *color = DCAST(ColorAttrib, rs->get_attrib_def(ColorAttrib::get_class_slot()));
if (color->get_color_type() == ColorAttrib::T_vertex) {
_vertex_colors = true;
} else if (color->get_color_type() == ColorAttrib::T_flat) {
_flat_colors = true;
}
// Break out the lights by type.
_shadows = false;
const LightAttrib *la = DCAST(LightAttrib, rs->get_attrib_def(LightAttrib::get_class_slot()));
for (int i=0; i<la->get_num_on_lights(); i++) {
NodePath light = la->get_on_light(i);
nassertv(!light.is_empty());
PandaNode *light_obj = light.node();
nassertv(light_obj != (PandaNode *)NULL);
if (light_obj->get_type() == AmbientLight::get_class_type()) {
_alights_np.push_back(light);
_alights.push_back((AmbientLight*)light_obj);
}
else if (light_obj->get_type() == DirectionalLight::get_class_type()) {
_dlights_np.push_back(light);
_dlights.push_back((DirectionalLight*)light_obj);
if (DCAST(LightLensNode, light_obj)->is_shadow_caster()) {
_shadows = true;
}
}
else if (light_obj->get_type() == PointLight::get_class_type()) {
_plights_np.push_back(light);
_plights.push_back((PointLight*)light_obj);
}
else if (light_obj->get_type() == Spotlight::get_class_type()) {
_slights_np.push_back(light);
_slights.push_back((Spotlight*)light_obj);
if (DCAST(LightLensNode, light_obj)->is_shadow_caster()) {
_shadows = true;
}
}
}
// See if there is a normal map, height map, gloss map, or glow map.
// Also check if anything has TexGen.
const TexGenAttrib *tex_gen = DCAST(TexGenAttrib, rs->get_attrib_def(TexGenAttrib::get_class_slot()));
for (int i=0; i<_num_textures; i++) {
TextureStage *stage = texture->get_on_stage(i);
TextureStage::Mode mode = stage->get_mode();
if ((mode == TextureStage::M_normal)||(mode == TextureStage::M_normal_height)) {
_map_index_normal = i;
}
if ((mode == TextureStage::M_height)||(mode == TextureStage::M_normal_height)) {
_map_index_height = i;
}
if ((mode == TextureStage::M_glow)||(mode == TextureStage::M_modulate_glow)) {
_map_index_glow = i;
}
if ((mode == TextureStage::M_gloss)||(mode == TextureStage::M_modulate_gloss)) {
_map_index_gloss = i;
}
if (mode == TextureStage::M_height) {
_map_height_in_alpha = false;
}
if (mode == TextureStage::M_normal_height) {
_map_height_in_alpha = true;
}
if (tex_gen->has_stage(stage)) {
switch (tex_gen->get_mode(stage)) {
case TexGenAttrib::M_world_position:
_need_world_position = true;
break;
case TexGenAttrib::M_world_normal:
_need_world_normal = true;
break;
case TexGenAttrib::M_eye_position:
_need_eye_position = true;
break;
case TexGenAttrib::M_eye_normal:
_need_eye_normal = true;
break;
}
}
}
// Determine whether lighting is needed.
if (la->get_num_on_lights() > 0) {
_lighting = true;
_need_eye_position = true;
_need_eye_normal = true;
}
// Find the material.
const MaterialAttrib *material = DCAST(MaterialAttrib, rs->get_attrib_def(MaterialAttrib::get_class_slot()));
if (!material->is_off()) {
_material = material->get_material();
} else {
_material = Material::get_default();
}
// Decide which material modes need to be calculated.
if (_lighting && (_alights.size() > 0)) {
if (_material->has_ambient()) {
Colorf a = _material->get_ambient();
if ((a[0]!=0.0)||(a[1]!=0.0)||(a[2]!=0.0)) {
_have_ambient = true;
}
} else {
_have_ambient = true;
}
}
if (_lighting && (_dlights.size() + _plights.size() + _slights.size())) {
if (_material->has_diffuse()) {
Colorf d = _material->get_diffuse();
if ((d[0]!=0.0)||(d[1]!=0.0)||(d[2]!=0.0)) {
_have_diffuse = true;
}
} else {
_have_diffuse = true;
}
}
if (_lighting && (_material->has_emission())) {
Colorf e = _material->get_emission();
if ((e[0]!=0.0)||(e[1]!=0.0)||(e[2]!=0.0)) {
_have_emission = true;
}
}
if (_lighting && (_dlights.size() + _plights.size() + _slights.size())) {
if (_material->has_specular()) {
Colorf s = _material->get_specular();
if ((s[0]!=0.0)||(s[1]!=0.0)||(s[2]!=0.0)) {
_have_specular = true;
}
} else if (_map_index_gloss >= 0) {
_have_specular = true;
}
}
// Decide whether to separate ambient and diffuse calculations.
if (_have_ambient && _have_diffuse) {
if (_material->has_ambient()) {
if (_material->has_diffuse()) {
_separate_ambient_diffuse = _material->get_ambient() != _material->get_diffuse();
} else {
_separate_ambient_diffuse = true;
}
} else {
if (_material->has_diffuse()) {
_separate_ambient_diffuse = true;
} else {
_separate_ambient_diffuse = false;
}
}
}
const LightRampAttrib *light_ramp = DCAST(LightRampAttrib, rs->get_attrib_def(LightRampAttrib::get_class_slot()));
if (_lighting &&
(light_ramp->get_mode() != LightRampAttrib::LRT_identity)) {
_separate_ambient_diffuse = true;
}
// Do we want to use the ARB_shadow extension?
// This also allows us to use hardware shadows / PCF.
_use_shadow_filter = _gsg->get_supports_shadow_filter();
// Does the shader need material properties as input?
_need_material_props =
(_have_ambient && (_material->has_ambient()))||
(_have_diffuse && (_material->has_diffuse()))||
(_have_emission && (_material->has_emission()))||
(_have_specular && (_material->has_specular()));
// Check for clip planes.
const ClipPlaneAttrib *clip_plane = DCAST(ClipPlaneAttrib, rs->get_attrib_def(ClipPlaneAttrib::get_class_slot()));
_num_clip_planes = clip_plane->get_num_on_planes();
if (_num_clip_planes > 0) {
_need_world_position = true;
}
// Check for unimplemented features and issue warnings.
const FogAttrib *fog = DCAST(FogAttrib, rs->get_attrib_def(FogAttrib::get_class_slot()));
if (!fog->is_off()) {
pgraph_cat.error() << "Shader Generator does not support Fog yet.\n";
}
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::clear_analysis
// Access: Protected
// Description: Called after analyze_renderstate to discard all
// the results of the analysis. This is generally done
// after shader generation is complete.
////////////////////////////////////////////////////////////////////
void ShaderGenerator::
clear_analysis() {
_vertex_colors = false;
_flat_colors = false;
_lighting = false;
_shadows = false;
_have_ambient = false;
_have_diffuse = false;
_have_emission = false;
_have_specular = false;
_separate_ambient_diffuse = false;
_map_index_normal = -1;
_map_index_glow = -1;
_map_index_gloss = -1;
_map_index_height = -1;
_map_height_in_alpha = false;
_calc_primary_alpha = false;
_have_alpha_test = false;
_have_alpha_blend = false;
_subsume_alpha_test = false;
_disable_alpha_write = false;
_num_clip_planes = 0;
_use_shadow_filter = false;
_out_primary_glow = false;
_out_aux_normal = false;
_out_aux_glow = false;
_out_aux_any = false;
_material = (Material*)NULL;
_need_material_props = false;
_need_world_position = false;
_need_world_normal = false;
_need_eye_position = false;
_need_eye_normal = false;
_alights.clear();
_dlights.clear();
_plights.clear();
_slights.clear();
_alights_np.clear();
_dlights_np.clear();
_plights_np.clear();
_slights_np.clear();
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::create_shader_attrib
// Access: Protected
// Description: Creates a ShaderAttrib given a generated shader's
// body. Also inserts the lights into the shader
// attrib.
////////////////////////////////////////////////////////////////////
CPT(RenderAttrib) ShaderGenerator::
create_shader_attrib(const string &txt) {
PT(Shader) shader = Shader::make(txt);
CPT(RenderAttrib) shattr = ShaderAttrib::make();
shattr=DCAST(ShaderAttrib, shattr)->set_shader(shader);
if (_lighting) {
for (int i=0; i<(int)_alights.size(); i++) {
shattr=DCAST(ShaderAttrib, shattr)->set_shader_input(InternalName::make("alight", i), _alights_np[i]);
}
for (int i=0; i<(int)_dlights.size(); i++) {
shattr=DCAST(ShaderAttrib, shattr)->set_shader_input(InternalName::make("dlight", i), _dlights_np[i]);
if (_shadows && _dlights[i]->_shadow_caster) {
PT(Texture) tex = update_shadow_buffer(_dlights_np[i]);
if (tex == NULL) {
pgraph_cat.error() << "Failed to create shadow buffer for DirectionalLight '" << _dlights[i]->get_name() << "'!\n";
}
shattr=DCAST(ShaderAttrib, shattr)->set_shader_input(InternalName::make("dlighttex", i), tex);
} else {
_dlights[i]->clear_shadow_buffers();
}
}
for (int i=0; i<(int)_plights.size(); i++) {
shattr=DCAST(ShaderAttrib, shattr)->set_shader_input(InternalName::make("plight", i), _plights_np[i]);
}
for (int i=0; i<(int)_slights.size(); i++) {
shattr=DCAST(ShaderAttrib, shattr)->set_shader_input(InternalName::make("slight", i), _slights_np[i]);
if (_shadows && _slights[i]->_shadow_caster) {
PT(Texture) tex = update_shadow_buffer(_slights_np[i]);
if (tex == NULL) {
pgraph_cat.error() << "Failed to create shadow buffer for Spotlight '" << _slights[i]->get_name() << "'!\n";
}
shattr=DCAST(ShaderAttrib, shattr)->set_shader_input(InternalName::make("slighttex", i), tex);
} else {
_slights[i]->clear_shadow_buffers();
}
}
}
return shattr;
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::update_shadow_buffer
// Access: Protected, Virtual
// Description: Updates the depth buffer of the specified light,
// if it is configured to cast shadows.
// Only call this function for DirectionalLights
// and Spotlights. Returns the depth texture.
////////////////////////////////////////////////////////////////////
PT(Texture) ShaderGenerator::
update_shadow_buffer(NodePath light_np) {
// Make sure everything is valid.
nassertr(light_np.node()->is_of_type(DirectionalLight::get_class_type()) ||
light_np.node()->is_of_type(Spotlight::get_class_type()), NULL);
PT(LightLensNode) light = DCAST(LightLensNode, light_np.node());
if (light == NULL || !light->_shadow_caster) {
return NULL;
}
// See if we already have a buffer. If not, create one.
PT(Texture) tex;
if (light->_sbuffers.count(_gsg) == 0) {
// Nope, the light doesn't have a buffer for our GSG. Make one.
tex = _gsg->make_shadow_buffer(light_np, _host);
} else {
// There's already a buffer - use that.
tex = light->_sbuffers[_gsg]->get_texture();
}
nassertr(tex != NULL, NULL);
return tex;
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::synthesize_shader
// Access: Published, Virtual
// Description: This is the routine that implements the next-gen
// fixed function pipeline by synthesizing a shader.
// It also takes care of setting up any buffers
// needed to produce the requested effects.
//
// Currently supports:
// - flat colors
// - vertex colors
// - lighting
// - normal maps, but not multiple
// - gloss maps, but not multiple
// - glow maps, but not multiple
// - materials, but not updates to materials
// - 2D textures
// - all texture stage modes, including combine modes
// - color scale attrib
// - light ramps (for cartoon shading)
// - shadow mapping
// - most texgen modes
// - texmatrix
// - 1D/2D/3D textures, cube textures
//
// Not yet supported:
// - dot3_rgb and dot3_rgba combine modes
// - fog
//
// Potential optimizations
// - omit attenuation calculations if attenuation off
//
////////////////////////////////////////////////////////////////////
CPT(RenderAttrib) ShaderGenerator::
synthesize_shader(const RenderState *rs) {
analyze_renderstate(rs);
reset_register_allocator();
pgraph_cat.info() << "Generating shader for render state " << rs << "\n";
// These variables will hold the results of register allocation.
char *normal_vreg = 0;
char *ntangent_vreg = 0;
char *ntangent_freg = 0;
char *nbinormal_vreg = 0;
char *nbinormal_freg = 0;
char *htangent_vreg = 0;
char *hbinormal_vreg = 0;
pvector<char *> texcoord_vreg;
pvector<char *> texcoord_freg;
pvector<char *> tslightvec_freg;
char *world_position_freg = 0;
char *world_normal_freg = 0;
char *eye_position_freg = 0;
char *eye_normal_freg = 0;
if (_vertex_colors) {
_vcregs_used = 1;
_fcregs_used = 1;
}
// Generate the shader's text.
ostringstream text;
text << "//Cg\n";
text << "void vshader(\n";
const TextureAttrib *texture = DCAST(TextureAttrib, rs->get_attrib_def(TextureAttrib::get_class_slot()));
const TexGenAttrib *tex_gen = DCAST(TexGenAttrib, rs->get_attrib_def(TexGenAttrib::get_class_slot()));
for (int i=0; i<_num_textures; i++) {
texcoord_vreg.push_back(alloc_vreg());
texcoord_freg.push_back(alloc_freg());
text << "\t in float4 vtx_texcoord" << i << " : " << texcoord_vreg[i] << ",\n";
text << "\t out float4 l_texcoord" << i << " : " << texcoord_freg[i] << ",\n";
}
if (_vertex_colors) {
text << "\t in float4 vtx_color : COLOR,\n";
text << "\t out float4 l_color : COLOR,\n";
}
if (_need_world_position || _need_world_normal) {
text << "\t uniform float4x4 trans_model_to_world,\n";
}
if (_need_world_position) {
world_position_freg = alloc_freg();
text << "\t out float4 l_world_position : " << world_position_freg << ",\n";
}
if (_need_world_normal) {
world_normal_freg = alloc_freg();
text << "\t out float4 l_world_normal : " << world_normal_freg << ",\n";
}
if (_need_eye_position) {
text << "\t uniform float4x4 trans_model_to_view,\n";
eye_position_freg = alloc_freg();
text << "\t out float4 l_eye_position : " << eye_position_freg << ",\n";
}
if (_need_eye_normal) {
eye_normal_freg = alloc_freg();
text << "\t uniform float4x4 tpose_view_to_model,\n";
text << "\t out float4 l_eye_normal : " << eye_normal_freg << ",\n";
}
if (_map_index_height >= 0 || _need_world_normal || _need_eye_normal) {
normal_vreg = alloc_vreg();
text << "\t in float4 vtx_normal : " << normal_vreg << ",\n";
}
if (_map_index_height >= 0) {
htangent_vreg = alloc_vreg();
hbinormal_vreg = alloc_vreg();
if (_map_index_normal == _map_index_height) {
ntangent_vreg = htangent_vreg;
nbinormal_vreg = hbinormal_vreg;
}
text << "\t in float4 vtx_tangent" << _map_index_height << " : " << htangent_vreg << ",\n";
text << "\t in float4 vtx_binormal" << _map_index_height << " : " << hbinormal_vreg << ",\n";
text << "\t uniform float4 mspos_view,\n";
text << "\t out float3 l_eyevec,\n";
}
if (_lighting) {
if (_map_index_normal >= 0) {
// If we had a height map and it used the same stage, that means we already have those inputs.
if (_map_index_normal != _map_index_height) {
ntangent_vreg = alloc_vreg();
nbinormal_vreg = alloc_vreg();
text << "\t in float4 vtx_tangent" << _map_index_normal << " : " << ntangent_vreg << ",\n";
text << "\t in float4 vtx_binormal" << _map_index_normal << " : " << nbinormal_vreg << ",\n";
}
ntangent_freg = alloc_freg();
nbinormal_freg = alloc_freg();
text << "\t out float4 l_tangent : " << ntangent_freg << ",\n";
text << "\t out float4 l_binormal : " << nbinormal_freg << ",\n";
}
if (_shadows) {
for (int i=0; i<(int)_dlights.size(); i++) {
if (_dlights[i]->_shadow_caster) {
text << "\t uniform float4x4 trans_model_to_clip_of_dlight" << i << ",\n";
text << "\t out float4 l_dlightcoord" << i << ",\n";
}
}
for (int i=0; i<(int)_slights.size(); i++) {
if (_slights[i]->_shadow_caster) {
text << "\t uniform float4x4 trans_model_to_clip_of_slight" << i << ",\n";
text << "\t out float4 l_slightcoord" << i << ",\n";
}
}
}
}
text << "\t float4 vtx_position : POSITION,\n";
text << "\t out float4 l_position : POSITION,\n";
text << "\t uniform float4x4 mat_modelproj\n";
text << ") {\n";
text << "\t l_position = mul(mat_modelproj, vtx_position);\n";
if (_need_world_position) {
text << "\t l_world_position = mul(trans_model_to_world, vtx_position);\n";
}
if (_need_world_normal) {
text << "\t l_world_normal = mul(trans_model_to_world, vtx_normal);\n";
}
if (_need_eye_position) {
text << "\t l_eye_position = mul(trans_model_to_view, vtx_position);\n";
}
if (_need_eye_normal) {
text << "\t l_eye_normal.xyz = mul((float3x3)tpose_view_to_model, vtx_normal.xyz);\n";
text << "\t l_eye_normal.w = 0;\n";
}
for (int i=0; i<_num_textures; i++) {
if (!tex_gen->has_stage(texture->get_on_stage(i))) {
text << "\t l_texcoord" << i << " = vtx_texcoord" << i << ";\n";
}
}
if (_vertex_colors) {
text << "\t l_color = vtx_color;\n";
}
if (_lighting && (_map_index_normal >= 0)) {
text << "\t l_tangent.xyz = mul((float3x3)tpose_view_to_model, vtx_tangent" << _map_index_normal << ".xyz);\n";
text << "\t l_tangent.w = 0;\n";
text << "\t l_binormal.xyz = mul((float3x3)tpose_view_to_model, -vtx_binormal" << _map_index_normal << ".xyz);\n";
text << "\t l_binormal.w = 0;\n";
}
if (_shadows) {
text << "\t float4x4 biasmat = {0.5f, 0.0f, 0.0f, 0.5f, 0.0f, 0.5f, 0.0f, 0.5f, 0.0f, 0.0f, 0.5f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f};\n";
for (int i=0; i<(int)_dlights.size(); i++) {
if (_dlights[i]->_shadow_caster) {
text << "\t l_dlightcoord" << i << " = mul(biasmat, mul(trans_model_to_clip_of_dlight" << i << ", vtx_position));\n";
}
}
for (int i=0; i<(int)_slights.size(); i++) {
if (_slights[i]->_shadow_caster) {
text << "\t l_slightcoord" << i << " = mul(biasmat, mul(trans_model_to_clip_of_slight" << i << ", vtx_position));\n";
}
}
}
if (_map_index_height >= 0) {
text << "\t float3 eyedir = mspos_view.xyz - vtx_position.xyz;\n";
text << "\t l_eyevec.x = dot(vtx_tangent" << _map_index_height << ".xyz, eyedir);\n";
text << "\t l_eyevec.y = dot(vtx_binormal" << _map_index_height << ".xyz, eyedir);\n";
text << "\t l_eyevec.z = dot(vtx_normal.xyz, eyedir);\n";
text << "\t l_eyevec = normalize(l_eyevec);\n";
}
text << "}\n\n";
text << "void fshader(\n";
if (_need_world_position) {
text << "\t in float4 l_world_position : " << world_position_freg << ",\n";
}
if (_need_world_normal) {
text << "\t in float4 l_world_normal : " << world_normal_freg << ",\n";
}
if (_need_eye_position) {
text << "\t in float4 l_eye_position : " << eye_position_freg << ",\n";
}
if (_need_eye_normal) {
text << "\t in float4 l_eye_normal : " << eye_normal_freg << ",\n";
}
const TexMatrixAttrib *tex_matrix = DCAST(TexMatrixAttrib, rs->get_attrib_def(TexMatrixAttrib::get_class_slot()));
for (int i=0; i<_num_textures; i++) {
TextureStage *stage = texture->get_on_stage(i);
Texture *tex = texture->get_on_texture(stage);
nassertr(tex != NULL, NULL);
text << "\t uniform sampler" << texture_type_as_string(tex->get_texture_type()) << " tex_" << i << ",\n";
if (!tex_gen->has_stage(stage)) {
text << "\t in float4 l_texcoord" << i << " : " << texcoord_freg[i] << ",\n";
}
if (tex_matrix->has_stage(stage)) {
text << "\t uniform float4x4 texmat_" << i << ",\n";
}
}
if (_lighting && (_map_index_normal >= 0)) {
text << "\t in float3 l_tangent : " << ntangent_freg << ",\n";
text << "\t in float3 l_binormal : " << nbinormal_freg << ",\n";
}
if (_lighting) {
for (int i=0; i<(int)_alights.size(); i++) {
text << "\t uniform float4 alight_alight" << i << ",\n";
}
for (int i=0; i<(int)_dlights.size(); i++) {
text << "\t uniform float4x4 dlight_dlight" << i << "_rel_view,\n";
if (_shadows && _dlights[i]->_shadow_caster) {
if (_use_shadow_filter) {
text << "\t uniform sampler2DShadow k_dlighttex" << i << ",\n";
} else {
text << "\t uniform sampler2D k_dlighttex" << i << ",\n";
}
text << "\t float4 l_dlightcoord" << i << ",\n";
}
}
for (int i=0; i<(int)_plights.size(); i++) {
text << "\t uniform float4x4 plight_plight" << i << "_rel_view,\n";
}
for (int i=0; i<(int)_slights.size(); i++) {
text << "\t uniform float4x4 slight_slight" << i << "_rel_view,\n";
text << "\t uniform float4 satten_slight" << i << ",\n";
if (_shadows && _slights[i]->_shadow_caster) {
if (_use_shadow_filter) {
text << "\t uniform sampler2DShadow k_slighttex" << i << ",\n";
} else {
text << "\t uniform sampler2D k_slighttex" << i << ",\n";
}
text << "\t float4 l_slightcoord" << i << ",\n";
}
}
if (_need_material_props) {
text << "\t uniform float4x4 attr_material,\n";
}
if (_have_specular) {
if (_material->get_local()) {
text << "\t uniform float4 mspos_view,\n";
} else {
text << "\t uniform float4 row1_view_to_model,\n";
}
}
}
if (_map_index_height >= 0) {
text << "\t float3 l_eyevec,\n";
}
if (_out_aux_any) {
text << "\t out float4 o_aux : COLOR1,\n";
}
text << "\t out float4 o_color : COLOR0,\n";
if (_vertex_colors) {
text << "\t in float4 l_color : COLOR,\n";
} else {
text << "\t uniform float4 attr_color,\n";
}
for (int i=0; i<_num_clip_planes; ++i) {
text << "\t uniform float4 clipplane_" << i << ",\n";
}
text << "\t uniform float4 attr_colorscale\n";
text << ") {\n";
// Clipping first!
for (int i=0; i<_num_clip_planes; ++i) {
text << "\t if (l_world_position.x * clipplane_" << i << ".x + l_world_position.y ";
text << "* clipplane_" << i << ".y + l_world_position.z * clipplane_" << i << ".z + clipplane_" << i << ".w <= 0) {\n";
text << "\t discard;\n";
text << "\t }\n";
}
text << "\t float4 result;\n";
if (_out_aux_any) {
text << "\t o_aux = float4(0,0,0,0);\n";
}
// Now generate any texture coordinates according to TexGenAttrib. If it has a TexMatrixAttrib, also transform them.
for (int i=0; i<_num_textures; i++) {
TextureStage *stage = texture->get_on_stage(i);
if (tex_gen != NULL && tex_gen->has_stage(stage)) {
switch (tex_gen->get_mode(stage)) {
case TexGenAttrib::M_world_position:
text << "\t float4 l_texcoord" << i << " = l_world_position;\n";
break;
case TexGenAttrib::M_world_normal:
text << "\t float4 l_texcoord" << i << " = l_world_normal;\n";
break;
case TexGenAttrib::M_eye_position:
text << "\t float4 l_texcoord" << i << " = l_eye_position;\n";
break;
case TexGenAttrib::M_eye_normal:
text << "\t float4 l_texcoord" << i << " = l_eye_normal;\n";
text << "\t l_texcoord" << i << ".w = 1.0f;\n";
break;
default:
pgraph_cat.error() << "Unsupported TexGenAttrib mode\n";
text << "\t float4 l_texcoord" << i << " = float4(0, 0, 0, 0);\n";
}
}
if (tex_matrix != NULL && tex_matrix->has_stage(stage)) {
text << "\t l_texcoord" << i << " = mul(texmat_" << i << ", l_texcoord" << i << ");\n";
text << "\t l_texcoord" << i << ".xyz /= l_texcoord" << i << ".w;\n";
}
}
text << "\t // Fetch all textures.\n";
if (_map_index_height >= 0) {
Texture *tex = texture->get_on_texture(texture->get_on_stage(_map_index_height));
nassertr(tex != NULL, NULL);
text << "\t float4 tex" << _map_index_height << " = tex" << texture_type_as_string(tex->get_texture_type());
text << "(tex_" << _map_index_height << ", l_texcoord" << _map_index_height << ".";
switch(tex->get_texture_type()) {
case Texture::TT_cube_map:
case Texture::TT_3d_texture: text << "xyz"; break;
case Texture::TT_2d_texture: text << "xy"; break;
case Texture::TT_1d_texture: text << "x"; break;
}
text << ");\n\t float3 parallax_offset = l_eyevec.xyz * (tex" << _map_index_height;
if (_map_height_in_alpha) {
text << ".aaa";
} else {
text << ".rgb";
}
text << " * 0.2 - 0.1);\n";
}
for (int i=0; i<_num_textures; i++) {
if (i != _map_index_height) {
Texture *tex = texture->get_on_texture(texture->get_on_stage(i));
nassertr(tex != NULL, NULL);
// Parallax mapping pushes the texture coordinates of the other textures away from the camera.
// The normal map coordinates aren't pushed (since that would give inconsistent behaviour when
// the height map is packed with the normal map together).
if (_map_index_height >= 0 && i != _map_index_normal) {
text << "\t l_texcoord" << i << ".xyz += parallax_offset;\n";
}
text << "\t float4 tex" << i << " = tex" << texture_type_as_string(tex->get_texture_type());
text << "(tex_" << i << ", l_texcoord" << i << ".";
switch(tex->get_texture_type()) {
case Texture::TT_cube_map:
case Texture::TT_3d_texture: text << "xyz"; break;
case Texture::TT_2d_texture: text << "xy"; break;
case Texture::TT_1d_texture: text << "x"; break;
}
text << ");\n";
}
}
if (_lighting) {
if (_map_index_normal >= 0) {
text << "\t // Translate tangent-space normal in map to view-space.\n";
text << "\t float3 tsnormal = ((float3)tex" << _map_index_normal << " * 2) - 1;\n";
text << "\t l_eye_normal.xyz *= tsnormal.z;\n";
text << "\t l_eye_normal.xyz += l_tangent * tsnormal.x;\n";
text << "\t l_eye_normal.xyz += l_binormal * tsnormal.y;\n";
text << "\t l_eye_normal.xyz = normalize(l_eye_normal.xyz);\n";
} else {
text << "\t // Correct the surface normal for interpolation effects\n";
text << "\t l_eye_normal.xyz = normalize(l_eye_normal.xyz);\n";
}
}
if (_out_aux_normal) {
text << "\t // Output the camera-space surface normal\n";
text << "\t o_aux.rgb = (l_eye_normal.xyz*0.5) + float3(0.5,0.5,0.5);\n";
}
if (_lighting) {
text << "\t // Begin view-space light calculations\n";
text << "\t float ldist,lattenv,langle;\n";
text << "\t float4 lcolor,lspec,lvec,lpoint,latten,ldir,leye,lhalf;";
if (_shadows) {
text << "\t float lshad;\n";
}
if (_separate_ambient_diffuse) {
if (_have_ambient) {
text << "\t float4 tot_ambient = float4(0,0,0,0);\n";
}
if (_have_diffuse) {
text << "\t float4 tot_diffuse = float4(0,0,0,0);\n";
}
} else {
if (_have_ambient || _have_diffuse) {
text << "\t float4 tot_diffuse = float4(0,0,0,0);\n";
}
}
if (_have_specular) {
text << "\t float4 tot_specular = float4(0,0,0,0);\n";
if (_material->has_specular()) {
text << "\t float shininess = attr_material[3].w;\n";
} else {
text << "\t float shininess = 50; // no shininess specified, using default\n";
}
}
for (int i=0; i<(int)_alights.size(); i++) {
text << "\t // Ambient Light " << i << "\n";
text << "\t lcolor = alight_alight" << i << ";\n";
if (_separate_ambient_diffuse && _have_ambient) {
text << "\t tot_ambient += lcolor;\n";
} else if(_have_diffuse) {
text << "\t tot_diffuse += lcolor;\n";
}
}
for (int i=0; i<(int)_dlights.size(); i++) {
text << "\t // Directional Light " << i << "\n";
text << "\t lcolor = dlight_dlight" << i << "_rel_view[0];\n";
text << "\t lspec = dlight_dlight" << i << "_rel_view[1];\n";
text << "\t lvec = dlight_dlight" << i << "_rel_view[2];\n";
text << "\t lcolor *= saturate(dot(l_eye_normal.xyz, lvec.xyz));\n";
if (_shadows && _dlights[i]->_shadow_caster) {
if (_use_shadow_filter) {
text << "\t lshad = shadow2DProj(k_dlighttex" << i << ", l_dlightcoord" << i << ").r;\n";
} else {
text << "\t lshad = tex2Dproj(k_dlighttex" << i << ", l_dlightcoord" << i << ").r > l_dlightcoord" << i << ".z / l_dlightcoord" << i << ".w;\n";
}
text << "\t lcolor *= lshad;\n";
text << "\t lspec *= lshad;\n";
}
if (_have_diffuse) {
text << "\t tot_diffuse += lcolor;\n";
}
if (_have_specular) {
if (_material->get_local()) {
text << "\t lhalf = normalize(lvec - normalize(l_eye_position));\n";
} else {
text << "\t lhalf = dlight_dlight" << i << "_rel_view[3];\n";
}
text << "\t lspec *= pow(saturate(dot(l_eye_normal.xyz, lhalf.xyz)), shininess);\n";
text << "\t tot_specular += lspec;\n";
}
}
for (int i=0; i<(int)_plights.size(); i++) {
text << "\t // Point Light " << i << "\n";
text << "\t lcolor = plight_plight" << i << "_rel_view[0];\n";
text << "\t lspec = plight_plight" << i << "_rel_view[1];\n";
text << "\t lpoint = plight_plight" << i << "_rel_view[2];\n";
text << "\t latten = plight_plight" << i << "_rel_view[3];\n";
text << "\t lvec = lpoint - l_eye_position;\n";
text << "\t ldist = length(float3(lvec));\n";
text << "\t lvec /= ldist;\n";
text << "\t lattenv = 1/(latten.x + latten.y*ldist + latten.z*ldist*ldist);\n";
text << "\t lcolor *= lattenv * saturate(dot(l_eye_normal.xyz, lvec.xyz));\n";
if (_have_diffuse) {
text << "\t tot_diffuse += lcolor;\n";
}
if (_have_specular) {
if (_material->get_local()) {
text << "\t lhalf = normalize(lvec - normalize(l_eye_position));\n";
} else {
text << "\t lhalf = normalize(lvec - float4(0,1,0,0));\n";
}
text << "\t lspec *= lattenv;\n";
text << "\t lspec *= pow(saturate(dot(l_eye_normal.xyz, lhalf.xyz)), shininess);\n";
text << "\t tot_specular += lspec;\n";
}
}
for (int i=0; i<(int)_slights.size(); i++) {
text << "\t // Spot Light " << i << "\n";
text << "\t lcolor = slight_slight" << i << "_rel_view[0];\n";
text << "\t lspec = slight_slight" << i << "_rel_view[1];\n";
text << "\t lpoint = slight_slight" << i << "_rel_view[2];\n";
text << "\t ldir = slight_slight" << i << "_rel_view[3];\n";
text << "\t latten = satten_slight" << i << ";\n";
text << "\t lvec = lpoint - l_eye_position;\n";
text << "\t ldist = length(float3(lvec));\n";
text << "\t lvec /= ldist;\n";
text << "\t langle = saturate(dot(ldir.xyz, lvec.xyz));\n";
text << "\t lattenv = 1/(latten.x + latten.y*ldist + latten.z*ldist*ldist);\n";
text << "\t lattenv *= pow(langle, latten.w);\n";
text << "\t if (langle < ldir.w) lattenv = 0;\n";
text << "\t lcolor *= lattenv * saturate(dot(l_eye_normal.xyz, lvec.xyz));\n";
if (_shadows && _slights[i]->_shadow_caster) {
if (_use_shadow_filter) {
text << "\t lshad = shadow2DProj(k_slighttex" << i << ", l_slightcoord" << i << ").r;\n";
} else {
text << "\t lshad = tex2Dproj(k_slighttex" << i << ", l_slightcoord" << i << ").r > l_slightcoord" << i << ".z / l_slightcoord" << i << ".w;\n";
}
text << "\t lcolor *= lshad;\n";
text << "\t lspec *= lshad;\n";
}
if (_have_diffuse) {
text << "\t tot_diffuse += lcolor;\n";
}
if (_have_specular) {
if (_material->get_local()) {
text << "\t lhalf = normalize(lvec - normalize(l_eye_position));\n";
} else {
text << "\t lhalf = normalize(lvec - float4(0,1,0,0));\n";
}
text << "\t lspec *= lattenv;\n";
text << "\t lspec *= pow(saturate(dot(l_eye_normal.xyz, lhalf.xyz)), shininess);\n";
text << "\t tot_specular += lspec;\n";
}
}
const LightRampAttrib *light_ramp = DCAST(LightRampAttrib, rs->get_attrib_def(LightRampAttrib::get_class_slot()));
switch (light_ramp->get_mode()) {
case LightRampAttrib::LRT_single_threshold:
{
float t = light_ramp->get_threshold(0);
float l0 = light_ramp->get_level(0);
text << "\t // Single-threshold light ramp\n";
text << "\t float lr_in = dot(tot_diffuse.rgb, float3(0.33,0.34,0.33));\n";
text << "\t float lr_scale = (lr_in < " << t << ") ? 0.0 : (" << l0 << "/lr_in);\n";
text << "\t tot_diffuse = tot_diffuse * lr_scale;\n";
break;
}
case LightRampAttrib::LRT_double_threshold:
{
float t0 = light_ramp->get_threshold(0);
float t1 = light_ramp->get_threshold(1);
float l0 = light_ramp->get_level(0);
float l1 = light_ramp->get_level(1);
float l2 = light_ramp->get_level(2);
text << "\t // Double-threshold light ramp\n";
text << "\t float lr_in = dot(tot_diffuse.rgb, float3(0.33,0.34,0.33));\n";
text << "\t float lr_out = " << l0 << "\n";
text << "\t if (lr_in > " << t0 << ") lr_out=" << l1 << ";\n";
text << "\t if (lr_in > " << t1 << ") lr_out=" << l2 << ";\n";
text << "\t tot_diffuse = tot_diffuse * (lr_out / lr_in);\n";
break;
}
}
text << "\t // Begin view-space light summation\n";
if (_have_emission) {
if (_map_index_glow >= 0) {
text << "\t result = attr_material[2] * saturate(2 * (tex" << _map_index_glow << ".a - 0.5));\n";
} else {
text << "\t result = attr_material[2];\n";
}
} else {
if (_map_index_glow >= 0) {
text << "\t result = saturate(2 * (tex" << _map_index_glow << ".a - 0.5));\n";
} else {
text << "\t result = float4(0,0,0,0);\n";
}
}
if ((_have_ambient)&&(_separate_ambient_diffuse)) {
if (_material->has_ambient()) {
text << "\t result += tot_ambient * attr_material[0];\n";
} else if (_vertex_colors) {
text << "\t result += tot_ambient * l_color;\n";
} else if (_flat_colors) {
text << "\t result += tot_ambient * attr_color;\n";
} else {
text << "\t result += tot_ambient;\n";
}
}
if (_have_diffuse) {
if (_material->has_diffuse()) {
text << "\t result += tot_diffuse * attr_material[1];\n";
} else if (_vertex_colors) {
text << "\t result += tot_diffuse * l_color;\n";
} else if (_flat_colors) {
text << "\t result += tot_diffuse * attr_color;\n";
} else {
text << "\t result += tot_diffuse;\n";
}
}
if (light_ramp->get_mode() == LightRampAttrib::LRT_default) {
text << "\t result = saturate(result);\n";
}
text << "\t // End view-space light calculations\n";
// Combine in alpha, which bypasses lighting calculations.
// Use of lerp here is a workaround for a radeon driver bug.
if (_calc_primary_alpha) {
if (_vertex_colors) {
text << "\t result.a = l_color.a;\n";
} else if (_flat_colors) {
text << "\t result.a = attr_color.a;\n";
} else {
text << "\t result.a = 1;\n";
}
}
} else {
if (_vertex_colors) {
text << "\t result = l_color;\n";
} else if (_flat_colors) {
text << "\t result = attr_color;\n";
} else {
text << "\t result = float4(1,1,1,1);\n";
}
}
// Loop first to see if something is using primary_color or last_saved_result.
bool have_saved_result = false;
bool have_primary_color = false;
for (int i=0; i<_num_textures; i++) {
TextureStage *stage = texture->get_on_stage(i);
if (stage->get_mode() != TextureStage::M_combine) continue;
if (stage->uses_primary_color() && !have_primary_color) {
text << "\t float4 primary_color = result;\n";
have_primary_color = true;
}
if (stage->uses_last_saved_result() && !have_saved_result) {
text << "\t float4 last_saved_result = result;\n";
have_saved_result = true;
}
}
// Now loop through the textures to compose our magic blending formulas.
for (int i=0; i<_num_textures; i++) {
TextureStage *stage = texture->get_on_stage(i);
switch (stage->get_mode()) {
case TextureStage::M_modulate:
case TextureStage::M_modulate_glow:
case TextureStage::M_modulate_gloss:
text << "\t result *= tex" << i << ";\n";
break;
case TextureStage::M_decal:
text << "\t result.rgb = lerp(result, tex" << i << ", tex" << i << ".a).rgb;\n";
break;
case TextureStage::M_blend: {
LVecBase4f c = stage->get_color();
text << "\t result.rgb = lerp(result, tex" << i << " * float4("
<< c[0] << ", " << c[1] << ", " << c[2] << ", " << c[3] << "), tex" << i << ".r).rgb;\n";
break; }
case TextureStage::M_replace:
text << "\t result = tex" << i << ";\n";
break;
case TextureStage::M_add:
text << "\t result.rgb += tex" << i << ".rgb;\n";
if (_calc_primary_alpha) {
text << "\t result.a *= tex" << i << ".a;\n";
}
break;
case TextureStage::M_combine:
text << "\t result.rgb = ";
if (stage->get_combine_rgb_mode() != TextureStage::CM_undefined) {
text << combine_mode_as_string(stage, stage->get_combine_rgb_mode(), false, i);
} else {
text << "tex" << i << ".rgb";
}
if (stage->get_rgb_scale() != 1) {
text << " * " << stage->get_rgb_scale();
}
text << ";\n\t result.a = ";
if (stage->get_combine_alpha_mode() != TextureStage::CM_undefined) {
text << combine_mode_as_string(stage, stage->get_combine_alpha_mode(), true, i);
} else {
text << "tex" << i << ".a";
}
if (stage->get_alpha_scale() != 1) {
text << " * " << stage->get_alpha_scale();
}
text << ";\n";
break;
case TextureStage::M_blend_color_scale:
text << "\t result.rgb = lerp(result, tex" << i << " * attr_colorscale, tex" << i << ".r).rgb;\n";
break;
default:
break;
}
if (stage->get_saved_result() && have_saved_result) {
text << "\t last_saved_result = result;\n";
}
}
// Apply the color scale.
text << "\t result *= attr_colorscale;\n";
if (_subsume_alpha_test) {
const AlphaTestAttrib *alpha_test = DCAST(AlphaTestAttrib, rs->get_attrib_def(AlphaTestAttrib::get_class_slot()));
text << "\t // Shader includes alpha test:\n";
double ref = alpha_test->get_reference_alpha();
switch (alpha_test->get_mode()) {
case RenderAttrib::M_never: text<<"\t discard;\n";
case RenderAttrib::M_less: text<<"\t if (result.a >= "<<ref<<") discard;\n";
case RenderAttrib::M_equal: text<<"\t if (result.a != "<<ref<<") discard;\n";
case RenderAttrib::M_less_equal: text<<"\t if (result.a > "<<ref<<") discard;\n";
case RenderAttrib::M_greater: text<<"\t if (result.a <= "<<ref<<") discard;\n";
case RenderAttrib::M_not_equal: text<<"\t if (result.a == "<<ref<<") discard;\n";
case RenderAttrib::M_greater_equal: text<<"\t if (result.a < "<<ref<<") discard;\n";
}
}
if (_out_primary_glow) {
if (_map_index_glow >= 0) {
text << "\t result.a = tex" << _map_index_glow << ".a;\n";
} else {
text << "\t result.a = 0.5;\n";
}
}
if (_out_aux_glow) {
if (_map_index_glow >= 0) {
text << "\t o_aux.a = tex" << _map_index_glow << ".a;\n";
} else {
text << "\t o_aux.a = 0.5;\n";
}
}
if (_lighting) {
if (_have_specular) {
if (_material->has_specular()) {
text << "\t tot_specular *= attr_material[3];\n";
}
if (_map_index_gloss >= 0) {
text << "\t tot_specular *= tex" << _map_index_gloss << ".a;\n";
}
text << "\t result.rgb = result.rgb + tot_specular.rgb;\n";
}
}
const LightRampAttrib *light_ramp = DCAST(LightRampAttrib, rs->get_attrib_def(LightRampAttrib::get_class_slot()));
switch (light_ramp->get_mode()) {
case LightRampAttrib::LRT_hdr0:
text << "\t result.rgb = (result*result*result + result*result + result) / (result*result*result + result*result + result + 1);\n";
break;
case LightRampAttrib::LRT_hdr1:
text << "\t result.rgb = (result*result + result) / (result*result + result + 1);\n";
break;
case LightRampAttrib::LRT_hdr2:
text << "\t result.rgb = result / (result + 1);\n";
break;
default: break;
}
// The multiply is a workaround for a radeon driver bug.
// It's annoying as heck, since it produces an extra instruction.
text << "\t o_color = result * 1.000001;\n";
if (_subsume_alpha_test) {
text << "\t // Shader subsumes normal alpha test.\n";
}
if (_disable_alpha_write) {
text << "\t // Shader disables alpha write.\n";
}
text << "}\n";
// Insert the shader into the shader attrib.
CPT(RenderAttrib) shattr = create_shader_attrib(text.str());
if (_subsume_alpha_test) {
shattr=DCAST(ShaderAttrib, shattr)->set_flag(ShaderAttrib::F_subsume_alpha_test, true);
}
if (_disable_alpha_write) {
shattr=DCAST(ShaderAttrib, shattr)->set_flag(ShaderAttrib::F_disable_alpha_write, true);
}
clear_analysis();
reset_register_allocator();
return shattr;
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::combine_mode_as_string
// Access: Protected, Static
// Description: This 'synthesizes' a combine mode into a string.
////////////////////////////////////////////////////////////////////
const string ShaderGenerator::
combine_mode_as_string(CPT(TextureStage) stage, TextureStage::CombineMode c_mode, bool alpha, short texindex) {
ostringstream text;
switch (c_mode) {
case TextureStage::CM_modulate:
text << combine_source_as_string(stage, 0, alpha, alpha, texindex);
text << " * ";
text << combine_source_as_string(stage, 1, alpha, alpha, texindex);
break;
case TextureStage::CM_add:
text << combine_source_as_string(stage, 0, alpha, alpha, texindex);
text << " + ";
text << combine_source_as_string(stage, 1, alpha, alpha, texindex);
break;
case TextureStage::CM_add_signed:
pgraph_cat.error() << "TextureStage::CombineMode ADD_SIGNED not yet supported in per-pixel mode.\n";
break;
case TextureStage::CM_interpolate:
text << "lerp(";
text << combine_source_as_string(stage, 1, alpha, alpha, texindex);
text << ", ";
text << combine_source_as_string(stage, 0, alpha, alpha, texindex);
text << ", ";
text << combine_source_as_string(stage, 2, alpha, true, texindex);
text << ")";
break;
case TextureStage::CM_subtract:
text << combine_source_as_string(stage, 0, alpha, alpha, texindex);
text << " + ";
text << combine_source_as_string(stage, 1, alpha, alpha, texindex);
break;
case TextureStage::CM_dot3_rgb:
pgraph_cat.error() << "TextureStage::CombineMode DOT3_RGB not yet supported in per-pixel mode.\n";
break;
case TextureStage::CM_dot3_rgba:
pgraph_cat.error() << "TextureStage::CombineMode DOT3_RGBA not yet supported in per-pixel mode.\n";
break;
case TextureStage::CM_replace:
default: // Not sure if this is correct as default value.
text << combine_source_as_string(stage, 0, alpha, alpha, texindex);
break;
}
return text.str();
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::combine_source_as_string
// Access: Protected, Static
// Description: This 'synthesizes' a combine source into a string.
////////////////////////////////////////////////////////////////////
const string ShaderGenerator::
combine_source_as_string(CPT(TextureStage) stage, short num, bool alpha, bool single_value, short texindex) {
TextureStage::CombineSource c_src = TextureStage::CS_undefined;
TextureStage::CombineOperand c_op = TextureStage::CO_undefined;
if (alpha) {
switch (num) {
case 0:
c_src = stage->get_combine_alpha_source0();
c_op = stage->get_combine_alpha_operand0();
break;
case 1:
c_src = stage->get_combine_alpha_source1();
c_op = stage->get_combine_alpha_operand1();
break;
case 2:
c_src = stage->get_combine_alpha_source2();
c_op = stage->get_combine_alpha_operand2();
break;
}
} else {
switch (num) {
case 0:
c_src = stage->get_combine_rgb_source0();
c_op = stage->get_combine_rgb_operand0();
break;
case 1:
c_src = stage->get_combine_rgb_source1();
c_op = stage->get_combine_rgb_operand1();
break;
case 2:
c_src = stage->get_combine_rgb_source2();
c_op = stage->get_combine_rgb_operand2();
break;
}
}
ostringstream csource;
if (c_op == TextureStage::CO_one_minus_src_color ||
c_op == TextureStage::CO_one_minus_src_alpha) {
csource << "1.0f - ";
}
switch (c_src) {
case TextureStage::CS_texture:
csource << "tex" << texindex;
break;
case TextureStage::CS_constant: {
LVecBase4f c = stage->get_color();
csource << "float4(" << c[0] << ", " << c[1] << ", " << c[2] << ", " << c[3] << ")";
break; }
case TextureStage::CS_primary_color:
csource << "primary_color";
break;
case TextureStage::CS_previous:
csource << "result";
break;
case TextureStage::CS_constant_color_scale:
csource << "attr_colorscale";
break;
case TextureStage::CS_last_saved_result:
csource << "last_saved_result";
break;
}
if (c_op == TextureStage::CO_src_color || c_op == TextureStage::CO_one_minus_src_color) {
if (single_value) {
// Let's take the red channel.
csource << ".r";
} else {
csource << ".rgb";
}
} else {
csource << ".a";
if (!single_value) {
// Dunno if it's legal in the FPP at all, but let's just allow it.
return "float3(" + csource.str() + ")";
}
}
return csource.str();
}
////////////////////////////////////////////////////////////////////
// Function: ShaderGenerator::texture_type_as_string
// Access: Protected, Static
// Description: Returns 1D, 2D, 3D or CUBE, depending on the given
// texture type.
////////////////////////////////////////////////////////////////////
const string ShaderGenerator::
texture_type_as_string(Texture::TextureType ttype) {
switch (ttype) {
case Texture::TT_1d_texture:
return "1D";
break;
case Texture::TT_2d_texture:
return "2D";
break;
case Texture::TT_3d_texture:
return "3D";
break;
case Texture::TT_cube_map:
return "CUBE";
break;
default:
pgraph_cat.error() << "Unsupported texture type!\n";
return "2D";
}
}
Reference in New Issue View Git Blame Copy Permalink