Implement GL_MAX_PROGRAM_TEXEL_OFFSET and GL_MAX_TEXTURE_LOD_BIAS

src/Main/Config.hpp

@@ -98,6 +98,7 @@ namespace sw
 		MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 64,
 		MIN_PROGRAM_TEXEL_OFFSET = -8,
 		MAX_PROGRAM_TEXEL_OFFSET = 7,
+		MAX_TEXTURE_LOD = MIPMAP_LEVELS - 2,   // Trilinear accesses lod+1
 		RENDERTARGETS = 8,
 	};
 }

src/OpenGL/libGLESv2/Context.cpp

@@ -2178,15 +2178,18 @@ template<typename T> bool Context::getIntegerv(GLenum pname, T *params) const
 			*params = MAX_FRAGMENT_UNIFORM_COMPONENTS;
 			return true;
 		case GL_MAX_PROGRAM_TEXEL_OFFSET:
-			UNIMPLEMENTED();
+			// Note: SwiftShader has no actual texel offset limit, so this limit can be modified if required.
+			// In any case, any behavior outside the specified range is valid since the spec mentions:
+			// (see OpenGL ES 3.0.5, 3.8.10.1 Scale Factor and Level of Detail, p.153)
			// "If any of the offset values are outside the range of the  implementation-defined values
+			//  MIN_PROGRAM_TEXEL_OFFSET and MAX_PROGRAM_TEXEL_OFFSET, results of the texture lookup are
+			//  undefined."
 			*params = MAX_PROGRAM_TEXEL_OFFSET;
 			return true;
 		case GL_MAX_SERVER_WAIT_TIMEOUT:
 			*params = 0;
 			return true;
 		case GL_MAX_TEXTURE_LOD_BIAS:
-			UNIMPLEMENTED();
-			*params = 2;
+			*params = MAX_TEXTURE_LOD_BIAS;
 			return true;
 		case GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
 			*params = sw::MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS;
@@ -2216,7 +2219,11 @@ template<typename T> bool Context::getIntegerv(GLenum pname, T *params) const
 			*params = MAX_VERTEX_UNIFORM_COMPONENTS;
 			return true;
 		case GL_MIN_PROGRAM_TEXEL_OFFSET:
-			UNIMPLEMENTED();
+			// Note: SwiftShader has no actual texel offset limit, so this limit can be modified if required.
+			// In any case, any behavior outside the specified range is valid since the spec mentions:
+			// (see OpenGL ES 3.0.5, 3.8.10.1 Scale Factor and Level of Detail, p.153)
			// "If any of the offset values are outside the range of the  implementation-defined values
+			//  MIN_PROGRAM_TEXEL_OFFSET and MAX_PROGRAM_TEXEL_OFFSET, results of the texture lookup are
+			//  undefined."
 			*params = MIN_PROGRAM_TEXEL_OFFSET;
 			return true;
 		case GL_MINOR_VERSION:

src/OpenGL/libGLESv2/Context.h

@@ -88,6 +88,7 @@ enum
 	MAX_FRAGMENT_INPUT_VECTORS = 15,
 	MIN_PROGRAM_TEXEL_OFFSET = sw::MIN_PROGRAM_TEXEL_OFFSET,
 	MAX_PROGRAM_TEXEL_OFFSET = sw::MAX_PROGRAM_TEXEL_OFFSET,
+	MAX_TEXTURE_LOD_BIAS = sw::MAX_TEXTURE_LOD,
 	MAX_DRAW_BUFFERS = sw::RENDERTARGETS,
 	MAX_COLOR_ATTACHMENTS = MAX(MAX_DRAW_BUFFERS, 8),
 	MAX_FRAGMENT_UNIFORM_BLOCKS = sw::MAX_FRAGMENT_UNIFORM_BLOCKS,

src/Renderer/Sampler.cpp

@@ -72,7 +72,7 @@ namespace sw
 
 		texture.baseLevel = 0;
 		texture.maxLevel = 1000;
-		texture.maxLod = MIPMAP_LEVELS - 2;	// Trilinear accesses lod+1
+		texture.maxLod = MAX_TEXTURE_LOD;
 		texture.minLod = 0;
 	}
 
@@ -344,12 +344,12 @@ namespace sw
 
 	void Sampler::setMinLod(float minLod)
 	{
-		texture.minLod = clamp(minLod, 0.0f, (float)(MIPMAP_LEVELS - 2));
+		texture.minLod = clamp(minLod, 0.0f, (float)(MAX_TEXTURE_LOD));
 	}
 
 	void Sampler::setMaxLod(float maxLod)
 	{
-		texture.maxLod = clamp(maxLod, 0.0f, (float)(MIPMAP_LEVELS - 2));
+		texture.maxLod = clamp(maxLod, 0.0f, (float)(MAX_TEXTURE_LOD));
 	}
 
 	void Sampler::setFilterQuality(FilterType maximumFilterQuality)