Added emissive mapping support

Former-commit-id: f469b1bcada16f0f2350cc10e9dc25fcf3c24abe

src/Nazara/Renderer/Material.cpp

@@ -32,6 +32,7 @@ NzMaterial::NzMaterial(NzMaterial&& material)
 	// Nous "volons" la référence du matériau
 	material.m_customShader = nullptr;
 	material.m_diffuseMap = nullptr;
+	material.m_emissiveMap = nullptr;
 	material.m_heightMap = nullptr;
 	material.m_normalMap = nullptr;
 	material.m_specularMap = nullptr;
@@ -63,6 +64,19 @@ void NzMaterial::Apply(const NzShader* shader) const
 		}
 	}
 
+	if (m_emissiveMap)
+	{
+		int emissiveMapLocation = shader->GetUniformLocation("MaterialEmissiveMap");
+		if (emissiveMapLocation != -1)
+		{
+			nzUInt8 textureUnit;
+			if (shader->SendTexture(emissiveMapLocation, m_emissiveMap, &textureUnit))
+				NzRenderer::SetTextureSampler(textureUnit, m_diffuseSampler);
+			else
+				NazaraWarning("Failed to send emissive map");
+		}
+	}
+
 	if (m_heightMap)
 	{
 		int heightMapLocation = shader->GetUniformLocation("MaterialHeightMap");
@@ -195,6 +209,11 @@ nzBlendFunc NzMaterial::GetDstBlend() const
 	return m_dstBlend;
 }
 
+NzTexture* NzMaterial::GetEmissiveMap() const
+{
+	return m_emissiveMap;
+}
+
 nzFaceCulling NzMaterial::GetFaceCulling() const
 {
 	return m_faceCulling;
@@ -309,6 +328,7 @@ void NzMaterial::Reset()
 {
 	m_customShader.Reset();
 	m_diffuseMap.Reset();
+	m_emissiveMap.Reset();
 	m_heightMap.Reset();
 	m_normalMap.Reset();
 	m_specularMap.Reset();
@@ -366,6 +386,15 @@ void NzMaterial::SetDstBlend(nzBlendFunc func)
 	m_dstBlend = func;
 }
 
+void NzMaterial::SetEmissiveMap(NzTexture* map)
+{
+	m_emissiveMap = map;
+	if (m_emissiveMap)
+		m_shaderFlags |= nzShaderFlags_EmissiveMapping;
+	else
+		m_shaderFlags &= ~nzShaderFlags_EmissiveMapping;
+}
+
 void NzMaterial::SetFaceCulling(nzFaceCulling culling)
 {
 	m_faceCulling = culling;
@@ -438,6 +467,7 @@ NzMaterial& NzMaterial::operator=(NzMaterial&& material)
 	// Comme ça nous volons la référence du matériau
 	material.m_customShader = nullptr;
 	material.m_diffuseMap = nullptr;
+	material.m_emissiveMap = nullptr;
 	material.m_heightMap = nullptr;
 	material.m_normalMap = nullptr;
 	material.m_specularMap = nullptr;
@@ -467,6 +497,7 @@ void NzMaterial::Copy(const NzMaterial& material)
 {
 	m_customShader.Reset();
 	m_diffuseMap.Reset();
+	m_emissiveMap.Reset();
 	m_heightMap.Reset();
 	m_normalMap.Reset();
 	m_specularMap.Reset();
@@ -476,6 +507,7 @@ void NzMaterial::Copy(const NzMaterial& material)
 	// Ensuite une petite astuce pour récupérer correctement les références
 	m_customShader.Release();
 	m_diffuseMap.Release();
+	m_emissiveMap.Release();
 	m_heightMap.Release();
 	m_normalMap.Release();
 	m_specularMap.Release();

src/Nazara/Renderer/ShaderBuilder.cpp

@@ -81,6 +81,9 @@ namespace
 		if (flags & nzShaderFlags_DiffuseMapping)
 			sourceCode += "uniform sampler2D MaterialDiffuseMap;\n";
 
+		if (flags & nzShaderFlags_EmissiveMapping)
+			sourceCode += "uniform sampler2D MaterialEmissiveMap;\n";
+
 		if (flags & nzShaderFlags_Lighting)
 		{
 			if (flags & nzShaderFlags_NormalMapping)
@@ -124,6 +127,14 @@ namespace
 		sourceCode += "void main()\n"
 		              "{\n";
 
+		if (flags & nzShaderFlags_EmissiveMapping)
+		{
+			// Les emissive map court-circuitent l'éclairage
+			sourceCode += "vec3 emissive = vec3(" + textureLookupKW + "(MaterialEmissiveMap, vTexCoord));\n"
+			              "if (emissive == vec3(0.0, 0.0, 0.0))\n"
+			              "{\n";
+		}
+
 		if (flags & nzShaderFlags_Lighting)
 		{
 			sourceCode += "vec3 light = vec3(0.0, 0.0, 0.0);\n";
@@ -282,6 +293,14 @@ namespace
 		else
 			sourceCode += fragmentColorKW + " = MaterialDiffuse;\n";
 
+		if (flags & nzShaderFlags_EmissiveMapping)
+		{
+			sourceCode += "}\n"
+			              "else\n"
+			              + fragmentColorKW + " = vec4(emissive, MaterialDiffuse.a);\n";
+		}
+
+
 		sourceCode += "}\n";
 
 		return sourceCode;