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Fix issue with resetting ScissorAttrib state

Browse Source 
https://www.panda3d.org/forums/viewtopic.php?f=1&t=17505
This commit is contained in:
rdb 2015-01-02 22:38:02 +01:00
parent 5e5a04031f
commit 3831d44576
2 changed files with 53 additions and 10 deletions
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61
panda/src/glstuff/glGraphicsStateGuardian_src.cxx
View File

@ -316,6 +316,7 @@ CLP(GraphicsStateGuardian)(GraphicsEngine *engine, GraphicsPipe *pipe) :
_force_flush = gl_force_flush;
_scissor_enabled = false;
_scissor_attrib_active = false;
#ifdef DO_PSTATS
if (gl_finish) {
@ -2468,6 +2469,8 @@ prepare_display_region(DisplayRegionPipelineReader *dr) {
_draw_buffer_type |= _current_properties->get_aux_mask();
set_draw_buffer(_draw_buffer_type);
int count = dr->get_num_regions();
if (dr->get_scissor_enabled()) {
if (GLCAT.is_spam()) {
GLCAT.spam()
@ -2475,6 +2478,7 @@ prepare_display_region(DisplayRegionPipelineReader *dr) {
}
glEnable(GL_SCISSOR_TEST);
_scissor_enabled = true;
_scissor_array.resize(count);
} else {
if (GLCAT.is_spam()) {
GLCAT.spam()
@ -2482,27 +2486,35 @@ prepare_display_region(DisplayRegionPipelineReader *dr) {
}
glDisable(GL_SCISSOR_TEST);
_scissor_enabled = false;
_scissor_array.clear();
}
_scissor_attrib_active = false;
#ifndef OPENGLES
if (_supports_viewport_arrays) {
int count = dr->get_num_regions();
GLfloat *viewports = (GLfloat *)alloca(sizeof(GLfloat) * 4 * count);
GLint *scissors = (GLint *)alloca(sizeof(GLint) * 4 * count);
GLfloat *viewports = (GLfloat *)alloca(sizeof(GLfloat) * 4 * count);
// We store the scissor regions in a vector since we may need
// to switch back to it in do_issue_scissor.
for (int i = 0; i < count; ++i) {
GLint *sr = scissors + i * 4;
LVecBase4i sr;
dr->get_region_pixels(i, sr[0], sr[1], sr[2], sr[3]);
GLfloat *vr = viewports + i * 4;
vr[0] = (GLfloat) sr[0];
vr[1] = (GLfloat) sr[1];
vr[2] = (GLfloat) sr[2];
vr[3] = (GLfloat) sr[3];
if (_scissor_enabled) {
_scissor_array[i] = sr;
}
}
_glViewportArrayv(0, count, viewports);
if (dr->get_scissor_enabled()) {
_glScissorArrayv(0, count, scissors);
if (_scissor_enabled) {
_glScissorArrayv(0, count, _scissor_array[0].get_data());
}
if (GLCAT.is_spam()) {
GLCAT.spam()
<< "glViewportArrayv(0, " << count << ", [\n";
@ -2511,12 +2523,12 @@ prepare_display_region(DisplayRegionPipelineReader *dr) {
GLCAT.spam(false) << vr[0] << ", " << vr[1] << ", " << vr[2] << ", " << vr[3] << ",\n";
}
GLCAT.spam(false) << "])\n";
if (dr->get_scissor_enabled()) {
if (_scissor_enabled) {
GLCAT.spam()
<< "glScissorArrayv(0, " << count << ", [\n";
for (int i = 0; i < count; ++i) {
GLint *sr = scissors + i * 4;
GLCAT.spam(false) << sr[0] << ", " << sr[1] << ", " << sr[2] << ", " << sr[3] << ",\n";
const LVecBase4i &sr = _scissor_array[i];
GLCAT.spam(false) << sr << ",\n";
}
}
GLCAT.spam(false) << "])\n";
@ -2526,9 +2538,13 @@ prepare_display_region(DisplayRegionPipelineReader *dr) {
#endif // OPENGLES
{
glViewport(x, y, width, height);
if (dr->get_scissor_enabled()) {
if (_scissor_enabled) {
glScissor(x, y, width, height);
_scissor_array.resize(1);
_scissor_array[0].set(x, y, width, height);
}
if (GLCAT.is_spam()) {
GLCAT.spam()
<< "glViewport(" << x << ", " << y << ", " << width << ", " << height << ")\n";
@ -11984,5 +12000,30 @@ do_issue_scissor() {
<< "glScissor(" << x << ", " << y << ", " << width << ", " << height << ")\n";
}
glScissor(x, y, width, height);
_scissor_attrib_active = true;
} else if (_scissor_attrib_active) {
_scissor_attrib_active = false;
if (_scissor_array.size() > 0) {
// Scissoring is enabled on the display region.
// Revert to the scissor state specified in the DisplayRegion.
if (_supports_viewport_arrays) {
_glScissorArrayv(0, _scissor_array.size(), _scissor_array[0].get_data());
} else {
const LVecBase4i sr = _scissor_array[0];
glScissor(sr[0], sr[1], sr[2], sr[3]);
}
} else if (_scissor_enabled) {
// The display region had no scissor enabled. Disable scissoring.
if (GLCAT.is_spam()) {
GLCAT.spam()
<< "glDisable(GL_SCISSOR_TEST)\n";
}
glDisable(GL_SCISSOR_TEST);
_scissor_enabled = false;
}
}
}

2
panda/src/glstuff/glGraphicsStateGuardian_src.h
View File

@ -550,6 +550,8 @@ protected:
bool _point_perspective;
bool _vertex_blending_enabled;
bool _scissor_enabled;
bool _scissor_attrib_active;
epvector<LVecBase4i> _scissor_array;
#ifndef OPENGLES_1
PT(Shader) _current_shader;