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Add depth compare shader.

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This commit is contained in:
Sergey Lipskiy 2013-10-30 13:17:25 +07:00
parent 01073f40b0
commit 4660e272a0
1 changed files with 28 additions and 0 deletions
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28
GLSLCombiner.cpp
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@ -18,6 +18,7 @@ static GLhandleARB g_vertex_shader_object;
static GLhandleARB g_calc_light_shader_object;
static GLhandleARB g_calc_lod_shader_object;
static GLhandleARB g_calc_noise_shader_object;
static GLhandleARB g_calc_depth_shader_object;
static
void display_warning(const char *text, ...)
@ -279,6 +280,29 @@ static const char* vertex_shader =
"} \n"
;
static const char* depth_compare_shader =
"uniform int depthEnabled; \n"
"uniform int depthCompareEnabled; \n"
"uniform int depthUpdateEnabled; \n"
"uniform usampler2D zlut_texture; \n"
"layout(r16ui) uniform image2D depth_texture;\n"
"bool depth_compare() \n"
"{ \n"
" if (depthEnabled == 0) return true; \n"
" ivec2 coord = ivec2(gl_FragCoord.xy); \n"
" float bufZ = imageLoad(depth_texture,coord).r \n;"
" float Z = (gl_FragCoord.z*262143.0); \n"
" int x0 = int(floor(mod(Z, 512.0))); \n"
" int y0 = int(floor(Z / 512.0)); \n"
" float curZ = texelFetch(zlut_texture, ivec2(x0,y0), 0).r;\n"
" if (depthUpdateEnabled > 0 && curZ < bufZ) \n"
" imageStore(depth_texture,coord,vec4(curZ, 0.0, 0.0, 1.0));\n"
" if (depthCompareEnabled > 0) \n"
" return curZ <= bufZ; \n"
" return true; \n"
"} \n"
;
void InitGLSLCombiner()
{
glActiveTextureARB(GL_TEXTURE0_ARB);
@ -301,6 +325,10 @@ void InitGLSLCombiner()
g_calc_noise_shader_object = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
glShaderSourceARB(g_calc_noise_shader_object, 1, &noise_fragment_shader, NULL);
glCompileShaderARB(g_calc_noise_shader_object);
g_calc_depth_shader_object = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
glShaderSourceARB(g_calc_depth_shader_object, 1, &depth_compare_shader, NULL);
glCompileShaderARB(g_calc_depth_shader_object);
}
void DestroyGLSLCombiner() {