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[Feat] (MG_State/Texture): implement GL_TEXTURE_COMPARE_MODE

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swung0x48
2025-06-23 09:32:25 +08:00
parent fa657fbf0b
commit 7c3912b9ae
1 changed files with 51 additions and 7 deletions
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MG/MG_GL/Implementations/GL/Texture/GL_Texture.cpp
+51 -7
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@@ -70,8 +70,44 @@ namespace MG_GL::GL {
return components * typeSize;
}
// return value: mipmap type or not
bool FillFilterTypeFromGLEnum(GLenum pname, GLenum param, Diligent::FILTER_TYPE& filter, Diligent::FILTER_TYPE& mipFilter) {
Diligent::FILTER_TYPE ConvertCompareFilter(Diligent::FILTER_TYPE& filter, bool compare) {
if (compare) {
switch (filter) {
case Diligent::FILTER_TYPE_POINT: return Diligent::FILTER_TYPE_COMPARISON_POINT;
case Diligent::FILTER_TYPE_LINEAR: return Diligent::FILTER_TYPE_COMPARISON_LINEAR;
case Diligent::FILTER_TYPE_ANISOTROPIC: return Diligent::FILTER_TYPE_COMPARISON_ANISOTROPIC;
default: return filter;
}
} else {
switch (filter) {
case Diligent::FILTER_TYPE_COMPARISON_POINT: return Diligent::FILTER_TYPE_POINT;
case Diligent::FILTER_TYPE_COMPARISON_LINEAR: return Diligent::FILTER_TYPE_LINEAR;
case Diligent::FILTER_TYPE_COMPARISON_ANISOTROPIC: return Diligent::FILTER_TYPE_ANISOTROPIC;
default: return filter;
}
}
}
bool IsCompareFilter(Diligent::FILTER_TYPE filter) {
switch (filter) {
case Diligent::FILTER_TYPE_COMPARISON_POINT: return true;
case Diligent::FILTER_TYPE_COMPARISON_LINEAR: return true;
case Diligent::FILTER_TYPE_COMPARISON_ANISOTROPIC: return true;
default: return false;
}
}
void FillFilterTypeFromGLEnum(GLenum pname, GLenum param, Diligent::FILTER_TYPE& filter, Diligent::FILTER_TYPE& mipFilter) {
if (pname == GL_TEXTURE_COMPARE_MODE) {
bool compare = (param == GL_COMPARE_REF_TO_TEXTURE);
filter = ConvertCompareFilter(filter, compare);
mipFilter = ConvertCompareFilter(mipFilter, compare);
return;
}
bool filterIsCompare = IsCompareFilter(filter);
bool mipFilterIsCompare = IsCompareFilter(filter);
switch (param) {
case GL_NEAREST:
filter = Diligent::FILTER_TYPE_POINT;
@@ -86,23 +122,25 @@ namespace MG_GL::GL {
case GL_NEAREST_MIPMAP_NEAREST:
filter = Diligent::FILTER_TYPE_POINT;
mipFilter = Diligent::FILTER_TYPE_POINT;
return true;
break;
case GL_LINEAR_MIPMAP_NEAREST:
filter = Diligent::FILTER_TYPE_LINEAR;
mipFilter = Diligent::FILTER_TYPE_POINT;
return true;
break;
case GL_NEAREST_MIPMAP_LINEAR:
filter = Diligent::FILTER_TYPE_POINT;
mipFilter = Diligent::FILTER_TYPE_LINEAR;
return true;
break;
case GL_LINEAR_MIPMAP_LINEAR:
filter = Diligent::FILTER_TYPE_LINEAR;
mipFilter = Diligent::FILTER_TYPE_LINEAR;
return true;
break;
default:
break;
}
return false;
filter = ConvertCompareFilter(filter, filterIsCompare);
mipFilter = ConvertCompareFilter(mipFilter, mipFilterIsCompare);
}
Diligent::COMPARISON_FUNCTION ConvertComparsionFunc(GLint param) {
@@ -441,6 +479,9 @@ namespace MG_GL::GL {
case GL_TEXTURE_COMPARE_FUNC:
SamDesc.ComparisonFunc = ConvertComparsionFunc(param);
break;
case GL_TEXTURE_COMPARE_MODE:
FillFilterTypeFromGLEnum(pname, param, SamDesc.MinFilter, SamDesc.MipFilter);
break;
default:
MG_Util::Debug::LogE("%s: not handled pname: %s", __func__, MG_Util::Debug::GLEnumToString(pname));
}
@@ -517,6 +558,9 @@ namespace MG_GL::GL {
case GL_TEXTURE_COMPARE_FUNC:
SamDesc.ComparisonFunc = ConvertComparsionFunc(param);
break;
case GL_TEXTURE_COMPARE_MODE:
FillFilterTypeFromGLEnum(pname, param, SamDesc.MinFilter, SamDesc.MipFilter);
break;
default:
MG_Util::Debug::LogE("%s: not handled pname: %s", __func__, MG_Util::Debug::GLEnumToString(pname));
}