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Support Conservative Depth as a fallback for EarlyZ

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Allows Mesa based drivers to support ZCompLoc
This commit is contained in:
Scott Mansell
2015-10-18 00:43:22 +13:00
parent 4d3d947efc
commit e7b2a22225
4 changed files with 50 additions and 10 deletions
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18
Source/Core/VideoBackends/OGL/ProgramShaderCache.cpp
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@ -554,6 +554,22 @@ void ProgramShaderCache::CreateHeader()
break;
}
const char* earlyz_string = "";
if (!is_glsles && g_ActiveConfig.backend_info.bSupportsEarlyZ)
{
if (g_ogl_config.bSupportsEarlyFragmentTests)
{
earlyz_string = "#extension GL_ARB_shader_image_load_store : enable\n"
"#define FORCE_EARLY_Z layout(early_fragment_tests) in\n";
}
else if(g_ogl_config.bSupportsConservativeDepth)
{
// See PixelShaderGen for details about this fallback.
earlyz_string = "#extension GL_ARB_conservative_depth : enable\n"
"#define FORCE_EARLY_Z layout(depth_unchanged) out float gl_FragDepth\n";
}
}
snprintf(s_glsl_header, sizeof(s_glsl_header),
"%s\n"
"%s\n" // ubo
@ -594,7 +610,7 @@ void ProgramShaderCache::CreateHeader()
, GetGLSLVersionString().c_str()
, v < GLSL_140 ? "#extension GL_ARB_uniform_buffer_object : enable" : ""
, !is_glsles && g_ActiveConfig.backend_info.bSupportsEarlyZ ? "#extension GL_ARB_shader_image_load_store : enable" : ""
, earlyz_string
, (g_ActiveConfig.backend_info.bSupportsBindingLayout && v < GLSLES_310) ? "#extension GL_ARB_shading_language_420pack : enable" : ""
, (g_ogl_config.bSupportsMSAA && v < GLSL_150) ? "#extension GL_ARB_texture_multisample : enable" : ""
, g_ActiveConfig.backend_info.bSupportsBindingLayout ? "#define SAMPLER_BINDING(x) layout(binding = x)" : "#define SAMPLER_BINDING(x)"