Remove Image Texture requirement for some shaders

src/DepthBuffer.cpp

@@ -318,7 +318,7 @@ void DepthBuffer::activateDepthBufferTexture(FrameBuffer * _pBuffer)
 
 void DepthBuffer::bindDepthImageTexture()
 {
-	if (!Context::imageTextures)
+	if (!gfxContext.isSupported(graphics::SpecialFeatures::ImageTextures))
 		return;
 
 	Context::BindImageTextureParameters bindParams;

src/FrameBuffer.cpp

@@ -310,7 +310,7 @@ bool FrameBuffer::isValid(bool _forceCheck) const
 
 void FrameBuffer::resolveMultisampledTexture(bool _bForce)
 {
-	if (!Context::multisampling)
+	if (!gfxContext.isSupported(SpecialFeatures::Multisampling))
 		return;
 
 	if (m_resolved && !_bForce)

src/Graphics/Context.cpp

@@ -5,9 +5,6 @@ using namespace graphics;
 
 Context gfxContext;
 
-bool Context::imageTextures = false;
-bool Context::multisampling = false;
-
 Context::Context() {}
 
 Context::~Context() {
@@ -20,8 +17,6 @@ void Context::init()
 	m_impl.reset(new opengl::ContextImpl);
 	m_impl->init();
 	m_fbTexFormats.reset(m_impl->getFramebufferTextureFormats());
-	imageTextures = isSupported(SpecialFeatures::ImageTextures);
-	multisampling = isSupported(SpecialFeatures::Multisampling);
 }
 
 void Context::destroy()

src/Graphics/Context.h

@@ -22,7 +22,8 @@ namespace graphics {
 		WeakBlitFramebuffer,
 		DepthFramebufferTextures,
 		ShaderProgramBinary,
-		ImageTextures
+		ImageTextures,
+		LUTTextures
 	};
 
 	enum class ClampMode {
@@ -274,9 +275,6 @@ namespace graphics {
 
 		bool isFramebufferError() const;
 
-		static bool imageTextures;
-		static bool multisampling;
-
 	private:
 		std::unique_ptr<ContextImpl> m_impl;
 		std::unique_ptr<FramebufferTextureFormats> m_fbTexFormats;

src/Graphics/OpenGLContext/GLSL/glsl_CombinerProgramBuilder.cpp

@@ -236,10 +236,6 @@ public:
 		else {
 			std::stringstream ss;
 			ss << "#version " << Utils::to_string(_glinfo.majorVersion) << Utils::to_string(_glinfo.minorVersion) << "0 core " << std::endl;
-			if (_glinfo.imageTextures && _glinfo.majorVersion * 10 + _glinfo.minorVersion < 42) {
-				ss << "#extension GL_ARB_shader_image_load_store : enable" << std::endl
-					<< "#extension GL_ARB_shading_language_420pack : enable" << std::endl;
-			}
 			ss << "# define IN in" << std::endl << "# define OUT out" << std::endl;
 			m_part = ss.str();
 		}
@@ -1444,9 +1440,9 @@ public:
 					"}						\n"
 				;
 			} else {
-				if (_glinfo.imageTextures && (config.generalEmulation.hacks & hack_RE2) != 0) {
+				if ((config.generalEmulation.hacks & hack_RE2) != 0) {
 					m_part =
-						"layout(binding = 0, r32ui) highp uniform readonly uimage2D uZlutImage;\n"
+						"uniform lowp usampler2D uZlutImage;\n"
 						"highp float writeDepth()						        													\n"
 						"{																									\n"
 						;
@@ -1464,7 +1460,7 @@ public:
 						"  highp int iZ = FragDepth > 0.999 ? 262143 : int(floor(FragDepth * 262143.0));				\n"
 						"  mediump int y0 = clamp(iZ/512, 0, 511);															\n"
 						"  mediump int x0 = iZ - 512*y0;																	\n"
-						"  highp uint iN64z = imageLoad(uZlutImage,ivec2(x0,y0)).r;											\n"
+						"  highp uint iN64z = texelFetch(uZlutImage,ivec2(x0,y0), 0).r;											\n"
 						"  return clamp(float(iN64z)/65532.0, 0.0, 1.0);											\n"
 						"}																									\n"
 						;

src/Graphics/OpenGLContext/GLSL/glsl_CombinerProgramUniformFactory.cpp

@@ -141,6 +141,22 @@ private:
 	iUniform uDepthTex;
 };
 
+class UZLutTexture : public UniformGroup
+{
+public:
+	UZLutTexture(GLuint _program) {
+		LocateUniform(uZlutImage);
+	}
+
+	void update(bool _force) override
+	{
+		uZlutImage.set(int(graphics::textureIndices::ZLUTTex), _force);
+	}
+
+private:
+	iUniform uZlutImage;
+};
+
 class UTextures : public UniformGroup
 {
 public:
@@ -962,6 +978,9 @@ void CombinerProgramUniformFactory::buildUniforms(GLuint _program,
 
 	_uniforms.emplace_back(new UAlphaTestInfo(_program));
 
+	if ((config.generalEmulation.hacks & hack_RE2) != 0 && config.generalEmulation.enableFragmentDepthWrite != 0)
+		_uniforms.emplace_back(new UZLutTexture(_program));
+
 	if (config.frameBufferEmulation.N64DepthCompare != 0)
 		_uniforms.emplace_back(new UDepthInfo(_program));
 	else

src/Graphics/OpenGLContext/GLSL/glsl_ShaderStorage.h

@@ -20,7 +20,7 @@ namespace glsl {
 		bool _saveCombinerKeys(const graphics::Combiners & _combiners) const;
 		bool _loadFromCombinerKeys(graphics::Combiners & _combiners);
 
-		const u32 m_formatVersion = 0x1DU;
+		const u32 m_formatVersion = 0x1EU;
 		const u32 m_keysFormatVersion = 0x04;
 		const opengl::GLInfo & m_glinfo;
 		opengl::CachedUseProgram * m_useProgram;

src/Graphics/OpenGLContext/GLSL/glsl_SpecialShadersFactory.cpp

@@ -56,9 +56,9 @@ namespace glsl {
 		ShadowMapFragmentShader(const opengl::GLInfo & _glinfo)
 		{
 			m_part =
-				"layout(binding = 0, r32ui) highp uniform readonly uimage2D uZlutImage;\n"
+				"uniform lowp usampler2D uZlutImage;\n"
-				"layout(binding = 1, r32ui) highp uniform readonly uimage2D uTlutImage;\n"
+				"uniform lowp usampler2D uTlutImage;\n"
-				"layout(binding = 0) uniform sampler2D uDepthImage;		\n"
+				"uniform sampler2D uDepthImage;		\n"
 				"uniform lowp vec4 uFogColor;								\n"
 				"OUT lowp vec4 fragColor;									\n"
 				"lowp float get_alpha()										\n"
@@ -68,10 +68,10 @@ namespace glsl {
 				"  highp int iZ = bufZ > 0.999 ? 262143 : int(floor(bufZ * 262143.0));\n"
 				"  mediump int y0 = clamp(iZ/512, 0, 511);					\n"
 				"  mediump int x0 = iZ - 512*y0;							\n"
-				"  highp uint iN64z = imageLoad(uZlutImage,ivec2(x0,y0)).r;		\n"
+				"  highp uint iN64z = texelFetch(uZlutImage,ivec2(x0,y0), 0).r;		\n"
 				"  highp float n64z = clamp(float(iN64z)/65532.0, 0.0, 1.0);\n"
 				"  highp int index = min(255, int(n64z*255.0));				\n"
-				"  highp uint iAlpha = imageLoad(uTlutImage,ivec2(index,0)).r;\n"
+				"  highp uint iAlpha = texelFetch(uTlutImage,ivec2(index,0), 0).r;\n"
 				"  return float(iAlpha>>8)/255.0;							\n"
 				"}															\n"
 				"void main()												\n"
@@ -426,22 +426,34 @@ namespace glsl {
 			const ShaderPart * _vertexHeader,
 			const ShaderPart * _fragmentHeader)
 			: ShadowMapShaderBase(_glinfo, _useProgram, _vertexHeader, _fragmentHeader)
-			, m_loc(-1)
+			, m_locFog(-1)
+			, m_locZlut(-1)
+			, m_locTlut(-1)
+			, m_locDepthImage(-1)
 		{
 			m_useProgram->useProgram(m_program);
-			m_loc = glGetUniformLocation(GLuint(m_program), "uFogColor");
+			m_locFog = glGetUniformLocation(GLuint(m_program), "uFogColor");
+			m_locZlut = glGetUniformLocation(GLuint(m_program), "uZlutImage");
+			m_locTlut = glGetUniformLocation(GLuint(m_program), "uTlutImage");
+			m_locDepthImage = glGetUniformLocation(GLuint(m_program), "uDepthImage");
 			m_useProgram->useProgram(graphics::ObjectHandle::null);
 		}
 
 		void activate() override {
 			ShadowMapShaderBase::activate();
-			glUniform4fv(m_loc, 1, &gDP.fogColor.r);
+			glUniform4fv(m_locFog, 1, &gDP.fogColor.r);
+			glUniform1i(m_locZlut, int(graphics::textureIndices::ZLUTTex));
+			glUniform1i(m_locTlut, int(graphics::textureIndices::PaletteTex));
+			glUniform1i(m_locDepthImage, 0);
 			glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 			g_paletteTexture.update();
 		}
 
 	private:
-		int m_loc;
+		int m_locFog;
+		int m_locZlut;
+		int m_locTlut;
+		int m_locDepthImage;
 	};
 
 	/*---------------TexrectDrawerShader-------------*/
@@ -638,7 +650,7 @@ namespace glsl {
 
 	graphics::ShaderProgram * SpecialShadersFactory::createShadowMapShader() const
 	{
-		if (!m_glinfo.imageTextures)
+		if (m_glinfo.isGLES2)
 			return nullptr;
 
 		return new ShadowMapShader(m_glinfo, m_useProgram, m_vertexHeader, m_fragmentHeader);

src/Graphics/OpenGLContext/opengl_ContextImpl.cpp

@@ -469,6 +469,8 @@ bool ContextImpl::isSupported(graphics::SpecialFeatures _feature) const
 		return m_glInfo.shaderStorage;
 	case graphics::SpecialFeatures::DepthFramebufferTextures:
 		return m_glInfo.depthTexture;
+	case graphics::SpecialFeatures::LUTTextures:
+		return !m_glInfo.isGLES2;
 	}
 	return false;
 }

src/Graphics/OpenGLContext/opengl_GLInfo.cpp

@@ -56,7 +56,7 @@ void GLInfo::init() {
 	}
 	if (!imageTextures && config.frameBufferEmulation.N64DepthCompare != 0) {
 		config.frameBufferEmulation.N64DepthCompare = 0;
-		LOG(LOG_WARNING, "N64 depth compare and depth based fog will not work without Image Textures support provided in OpenGL >= 4.3 or GLES >= 3.1\n");
+		LOG(LOG_WARNING, "N64 depth compare will not work without Image Textures support provided in OpenGL >= 4.3 or GLES >= 3.1\n");
 	}
 	if (isGLES2)
 		config.generalEmulation.enableFragmentDepthWrite = 0;

src/Graphics/OpenGLContext/opengl_Parameters.cpp

@@ -74,8 +74,6 @@ namespace graphics {
 	}
 
 	namespace textureImageUnits {
-		ImageUnitParam Zlut(0U);
-		ImageUnitParam Tlut(1U);
 		ImageUnitParam DepthZ(2U);
 		ImageUnitParam DepthDeltaZ(3U);
 	}

src/Graphics/OpenGLContext/opengl_TextureManipulationObjectFactory.cpp

@@ -191,7 +191,6 @@ namespace opengl {
 				}
 
 				if (_params.ImageUnit.isValid()) {
-					assert(IS_GL_FUNCTION_VALID(glBindImageTexture));
 					glBindImageTexture(GLuint(_params.ImageUnit), GLuint(_params.handle),
 					0, GL_FALSE, GL_FALSE, GL_READ_ONLY, GLuint(_params.internalFormat));
 				}
@@ -273,7 +272,6 @@ namespace opengl {
 				_params.data);
 
 			if (_params.ImageUnit.isValid() && _params.internalFormat.isValid()) {
-				assert(IS_GL_FUNCTION_VALID(glBindImageTexture));
 				glBindImageTexture(GLuint(_params.ImageUnit), GLuint(_params.handle),
 				0, GL_FALSE, GL_FALSE, GL_READ_ONLY, GLuint(_params.internalFormat));
 			}

src/GraphicsDrawer.cpp

@@ -31,7 +31,6 @@ GraphicsDrawer::GraphicsDrawer()
 , m_dmaVerticesNum(0)
 , m_modifyVertices(0)
 , m_maxLineWidth(1.0f)
-, m_bImageTexture(false)
 , m_bFlatColors(false)
 {
 	memset(m_rect, 0, sizeof(m_rect));
@@ -991,7 +990,7 @@ bool texturedRectShadowMap(const GraphicsDrawer::TexturedRectParams &)
 		if (gDP.textureImage.size == 2 && gDP.textureImage.address >= gDP.depthImageAddress &&
 			gDP.textureImage.address < (gDP.depthImageAddress + gDP.colorImage.width*gDP.colorImage.width * 6 / 4)) {
 
-			if (!Context::imageTextures)
+			if (!gfxContext.isSupported(SpecialFeatures::LUTTextures))
 				return true;
 
 			pCurrentBuffer->m_pDepthBuffer->activateDepthBufferTexture(pCurrentBuffer);
@@ -1721,7 +1720,6 @@ void GraphicsDrawer::_initData()
 	FBInfo::fbInfo.reset();
 	m_texrectDrawer.init();
 	m_drawingState = DrawingState::Non;
-	m_bImageTexture = gfxContext.isSupported(SpecialFeatures::ImageTextures);
 	m_maxLineWidth = gfxContext.getMaxLineWidth();
 
 	gSP.changed = gDP.changed = 0xFFFFFFFF;

src/GraphicsDrawer.h

@@ -132,8 +132,6 @@ public:
 		return (triangles.vertices[_v0].clip & triangles.vertices[_v1].clip & triangles.vertices[_v2].clip) != 0;
 	}
 
-	bool isImageTexturesSupported() const { return m_bImageTexture; }
-
 	SPVertex & getVertex(u32 _v) { return triangles.vertices[_v]; }
 
 	SPVertex * getVertexPtr(u32 _v) { return triangles.vertices.data() + _v; }
@@ -205,7 +203,6 @@ private:
 
 	u32 m_modifyVertices;
 	f32 m_maxLineWidth;
-	bool m_bImageTexture;
 	bool m_bFlatColors;
 	TexrectDrawer m_texrectDrawer;
 	OSDMessages m_osdMessages;

src/PaletteTexture.cpp

@@ -19,7 +19,7 @@ PaletteTexture::PaletteTexture()
 
 void PaletteTexture::init()
 {
-	if (!Context::imageTextures)
+	if (!gfxContext.isSupported(SpecialFeatures::LUTTextures))
 		return;
 
 	const FramebufferTextureFormats & fbTexFormats = gfxContext.getFramebufferTextureFormats();
@@ -40,7 +40,6 @@ void PaletteTexture::init()
 
 	Context::InitTextureParams initParams;
 	initParams.handle = m_pTexture->name;
-	initParams.ImageUnit = textureImageUnits::Tlut;
 	initParams.width = m_pTexture->realWidth;
 	initParams.height = m_pTexture->realHeight;
 	initParams.internalFormat = fbTexFormats.lutInternalFormat;
@@ -64,19 +63,11 @@ void PaletteTexture::init()
 
 void PaletteTexture::destroy()
 {
-	if (!Context::imageTextures)
+	if (!gfxContext.isSupported(SpecialFeatures::LUTTextures))
 		return;
 
 	const FramebufferTextureFormats & fbTexFormats = gfxContext.getFramebufferTextureFormats();
 
-	Context::BindImageTextureParameters bindParams;
-	bindParams.imageUnit = textureImageUnits::Tlut;
-	bindParams.texture = ObjectHandle::null;
-	bindParams.accessMode = textureImageAccessMode::READ_ONLY;
-	bindParams.textureFormat = fbTexFormats.lutInternalFormat;
-
-	gfxContext.bindImageTexture(bindParams);
-
 	textureCache().removeFrameBufferTexture(m_pTexture);
 	m_pTexture = nullptr;
 	free(m_pbuf);
@@ -84,7 +75,7 @@ void PaletteTexture::destroy()
 
 void PaletteTexture::update()
 {
-	if (!Context::imageTextures)
+	if (!gfxContext.isSupported(SpecialFeatures::LUTTextures))
 		return;
 
 	if (m_paletteCRC256 == gDP.paletteCRC256)
@@ -100,7 +91,6 @@ void PaletteTexture::update()
 	const FramebufferTextureFormats & fbTexFormats = gfxContext.getFramebufferTextureFormats();
 	Context::UpdateTextureDataParams params;
 	params.handle = m_pTexture->name;
-	params.ImageUnit = textureImageUnits::Tlut;
 	params.textureUnitIndex = textureIndices::PaletteTex;
 	params.width = m_pTexture->realWidth;
 	params.height = m_pTexture->realHeight;

src/ZlutTexture.cpp

@@ -16,7 +16,7 @@ ZlutTexture::ZlutTexture()
 
 void ZlutTexture::init()
 {
-	if (!Context::imageTextures)
+	if (!gfxContext.isSupported(SpecialFeatures::LUTTextures))
 		return;
 
 	const FramebufferTextureFormats & fbTexFormats = gfxContext.getFramebufferTextureFormats();
@@ -41,7 +41,6 @@ void ZlutTexture::init()
 
 	Context::InitTextureParams initParams;
 	initParams.handle = m_pTexture->name;
-	initParams.ImageUnit = textureImageUnits::Zlut;
 	initParams.width = m_pTexture->realWidth;
 	initParams.height = m_pTexture->realHeight;
 	initParams.internalFormat = fbTexFormats.lutInternalFormat;
@@ -61,20 +60,13 @@ void ZlutTexture::init()
 	gfxContext.setTextureParameters(setParams);
 }
 
-void ZlutTexture::destroy() {
+void ZlutTexture::destroy()
-	if (!Context::imageTextures)
+{
+	if (!gfxContext.isSupported(SpecialFeatures::LUTTextures))
 		return;
 
 	const FramebufferTextureFormats & fbTexFormats = gfxContext.getFramebufferTextureFormats();
 
-	Context::BindImageTextureParameters bindParams;
-	bindParams.imageUnit = textureImageUnits::Zlut;
-	bindParams.texture = ObjectHandle::null;
-	bindParams.accessMode = textureImageAccessMode::READ_ONLY;
-	bindParams.textureFormat = fbTexFormats.lutInternalFormat;
-
-	gfxContext.bindImageTexture(bindParams);
-
 	textureCache().removeFrameBufferTexture(m_pTexture);
 	m_pTexture = nullptr;
 }