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Added support for parallax mapping

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rdb 2009-06-11 11:04:47 +00:00
parent f098e8239f
commit eb5b308edf
2 changed files with 73 additions and 18 deletions
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90
panda/src/pgraphnodes/shaderGenerator.cxx
View File

@ -248,6 +248,12 @@ analyze_renderstate(const RenderState *rs) {
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;
}
}
// Determine whether lighting is needed.
@ -385,9 +391,10 @@ clear_analysis() {
_have_specular = false;
_separate_ambient_diffuse = false;
_map_index_normal = -1;
_map_index_height = -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;
@ -535,10 +542,12 @@ synthesize_shader(const RenderState *rs) {
char *pos_freg = 0;
char *normal_vreg = 0;
char *normal_freg = 0;
char *tangent_vreg = 0;
char *tangent_freg = 0;
char *binormal_vreg = 0;
char *binormal_freg = 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;
@ -569,24 +578,41 @@ synthesize_shader(const RenderState *rs) {
text << "\t out float4 l_worldpos,\n";
text << "\t uniform float4x4 trans_model_to_world,\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 (_map_index_height >= 0 || _lighting) {
normal_vreg = alloc_vreg();
text << "\t in float4 vtx_normal : " << normal_vreg << ",\n";
}
if (_lighting) {
pos_freg = alloc_freg();
normal_vreg = alloc_vreg();
normal_freg = alloc_freg();
text << "\t uniform float4x4 trans_model_to_view,\n";
text << "\t uniform float4x4 tpose_view_to_model,\n";
text << "\t in float4 vtx_normal : " << normal_vreg << ",\n";
text << "\t out float4 l_normal : " << normal_freg << ",\n";
text << "\t out float4 l_pos : " << pos_freg << ",\n";
if (_map_index_normal >= 0) {
tangent_vreg = alloc_vreg();
tangent_freg = alloc_freg();
binormal_vreg = alloc_vreg();
binormal_freg = alloc_freg();
text << "\t in float4 vtx_tangent" << _map_index_normal << " : " << tangent_vreg << ",\n";
text << "\t in float4 vtx_binormal" << _map_index_normal << " : " << binormal_vreg << ",\n";
text << "\t out float4 l_tangent : " << tangent_freg << ",\n";
text << "\t out float4 l_binormal : " << binormal_freg << ",\n";
// 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++) {
@ -653,6 +679,13 @@ synthesize_shader(const RenderState *rs) {
}
}
}
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";
@ -667,8 +700,8 @@ synthesize_shader(const RenderState *rs) {
text << "\t in float3 l_normal : " << normal_freg << ",\n";
}
if (_lighting && (_map_index_normal >= 0)) {
text << "\t in float3 l_tangent : " << tangent_freg << ",\n";
text << "\t in float3 l_binormal : " << binormal_freg << ",\n";
text << "\t in float3 l_tangent : " << ntangent_freg << ",\n";
text << "\t in float3 l_binormal : " << nbinormal_freg << ",\n";
}
if (_lighting) {
text << "\t in float4 l_pos : " << pos_freg << ",\n";
@ -715,6 +748,9 @@ synthesize_shader(const RenderState *rs) {
}
}
}
if (_map_index_height >= 0) {
text << "\t float3 l_eyevec,\n";
}
if (_out_aux_any) {
text << "\t out float4 o_aux : COLOR1,\n";
}
@ -741,8 +777,26 @@ synthesize_shader(const RenderState *rs) {
text << "\t o_aux = float4(0,0,0,0);\n";
}
text << "\t // Fetch all textures.\n";
if (_map_index_height >= 0) {
text << "\t float4 tex" << _map_index_height << " = tex2D(tex_" << _map_index_height << ", float2(l_texcoord" << _map_index_height << "));\n";
text << "\t float2 parallax_offset = l_eyevec.xy * (tex" << _map_index_height;
if (_map_height_in_alpha) {
text << ".aa";
} else {
text << ".rg";
}
text << " * 0.2 - 0.1);\n";
}
for (int i=0; i<_num_textures; i++) {
text << "\t float4 tex" << i << " = tex2D(tex_" << i << ", float2(l_texcoord" << i << "));\n";
if (i != _map_index_height) {
// 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 << ".xy += parallax_offset;\n";
}
text << "\t float4 tex" << i << " = tex2D(tex_" << i << ", float2(l_texcoord" << i << "));\n";
}
}
if (_lighting) {
if (_map_index_normal >= 0) {

1
panda/src/pgraphnodes/shaderGenerator.h
View File

@ -119,6 +119,7 @@ protected:
int _map_index_height;
int _map_index_glow;
int _map_index_gloss;
bool _map_height_in_alpha;
bool _out_primary_glow;
bool _out_aux_normal;