Optimized OpenGL samplers binding

Former-commit-id: 6afb2ed4d9851e09ff1006cf7c81df0cac0bed7d

include/Nazara/Renderer/OpenGL.hpp

@@ -78,6 +78,7 @@ class NAZARA_API NzOpenGL
 
 		static void BindBuffer(nzBufferType type, GLuint id);
 		static void BindProgram(GLuint id);
+		static void BindSampler(GLuint unit, GLuint id);
 		static void BindScissorBox(const NzRecti& scissorBox);
 		static void BindTexture(nzImageType type, GLuint id);
 		static void BindTexture(unsigned int textureUnit, nzImageType type, GLuint id);
@@ -86,6 +87,7 @@ class NAZARA_API NzOpenGL
 
 		static void DeleteBuffer(nzBufferType type, GLuint id);
 		static void DeleteProgram(GLuint id);
+		static void DeleteSampler(GLuint id);
 		static void DeleteTexture(GLuint id);
 
 		static GLuint GetCurrentBuffer(nzBufferType type);

src/Nazara/Renderer/OpenGL.cpp

@@ -67,6 +67,7 @@ namespace
 	{
 		GLuint buffersBinding[nzBufferType_Max+1] = {0};
 		GLuint currentProgram = 0;
+		GLuint samplers[32] = {0}; // 32 est pour l'instant la plus haute limite (GL_TEXTURE31)
 		GLuint texturesBinding[32] = {0}; // 32 est pour l'instant la plus haute limite (GL_TEXTURE31)
 		NzRecti currentScissorBox = NzRecti(0,0,0,0);
 		NzRecti currentViewport = NzRecti(0,0,0,0);
@@ -326,6 +327,29 @@ void NzOpenGL::BindProgram(GLuint id)
 	}
 }
 
+void NzOpenGL::BindSampler(GLuint unit, GLuint id)
+{
+	#ifdef NAZARA_DEBUG
+	if (!glBindSampler)
+	{
+		NazaraError("Sampler are not supported");
+		return;
+	}
+
+	if (!s_contextStates)
+	{
+		NazaraError("No context activated");
+		return;
+	}
+	#endif
+
+	if (s_contextStates->samplers[unit] != id)
+	{
+		glBindSampler(unit, id);
+		s_contextStates->samplers[unit] = id;
+	}
+}
+
 void NzOpenGL::BindScissorBox(const NzRecti& scissorBox)
 {
 	#ifdef NAZARA_DEBUG
@@ -487,6 +511,31 @@ void NzOpenGL::DeleteProgram(GLuint id)
 		s_contextStates->currentProgram = 0;
 }
 
+void NzOpenGL::DeleteSampler(GLuint id)
+{
+	#ifdef NAZARA_DEBUG
+	if (!glDeleteSamplers)
+	{
+		NazaraError("Sampler are not supported");
+		return;
+	}
+
+	if (!s_contextStates)
+	{
+		NazaraError("No context activated");
+		return;
+	}
+	#endif
+
+	glDeleteSamplers(1, &id);
+
+	for (GLuint& binding : s_contextStates->samplers)
+	{
+		if (binding == id)
+			binding = 0;
+	}
+}
+
 void NzOpenGL::DeleteTexture(GLuint id)
 {
 	#ifdef NAZARA_DEBUG

src/Nazara/Renderer/TextureSampler.cpp

@@ -286,7 +286,7 @@ void NzTextureSampler::Bind(unsigned int unit) const
 	if (!m_samplerId)
 		UpdateSamplerId();
 
-	glBindSampler(unit, m_samplerId);
+	NzOpenGL::BindSampler(unit, m_samplerId);
 }
 
 unsigned int NzTextureSampler::GetOpenGLID() const
@@ -379,7 +379,7 @@ void NzTextureSampler::Uninitialize()
 	{
 		NzContext::EnsureContext();
 		for (const std::pair<nzUInt32, GLuint>& pair : s_samplers)
-			glDeleteSamplers(1, &pair.second);
+			NzOpenGL::DeleteSampler(pair.second);
 
 		s_samplers.clear();
 	}