Simplified querying of uniforms

data/shaders/fs_simple.glsl

@@ -2,6 +2,8 @@
 
 layout(location = 0) out vec3 outColor;
 
+uniform vec4 uColor;
+
 void main() {
-	outColor = vec3(1, 0, 0);
+	outColor = uColor.rgb; 
 }

data/shaders/fs_simpletexture.glsl

@@ -8,10 +8,11 @@ uniform sampler2D uTexture;
 uniform float uTime;
 
 void main() {
-	outColor = texture(uTexture, ioUV 
-	+ 0.00 * vec2(
-		sin(uTime + 1024.0 * ioUV.x),
-		cos(uTime + 768.0  * ioUV.y)
-		)
-	).xyz;
+	outColor = texture(uTexture, 
+			ioUV 
+			+ 0.01 * vec2(
+				sin(uTime + 1024.0 * ioUV.x),
+				cos(uTime + 768.0  * ioUV.y)
+				)
+			).xyz;
 }

data/shaders/vs_passthrough.glsl

@@ -2,6 +2,7 @@
 
 in vec3 inVertex;
 uniform mat4 uModelViewProj;
+uniform float uTime;
 
 out vec2 ioUV;
 

data/shaders/vs_simple.glsl

@@ -1,9 +1,10 @@
 #version 150 core
 #extension GL_ARB_explicit_uniform_location : require
 
-in vec3 vertexPosition_modelspace;
+in vec3 inVertex;
+
+uniform mat4 uModelViewProj;
 
 void main() {
-	gl_Position.xyz = vertexPosition_modelspace;
-	gl_Position.w = 1.0;
+	gl_Position = uModelViewProj * vec4(inVertex, 1);
 }

src/modules/RenderModule.cc

@@ -131,10 +131,12 @@ void Renderer::Initialize(int width, int height) {
 	glBindBuffer(GL_ARRAY_BUFFER, mMesh.mVertexBuffer);
 glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
 
-	// Shaders
-	mProgram = RenderProgram("data/shaders/vs_simple.glsl", "data/shaders/fs_simple.glsl");
-	bool load_result = mProgram.Load();
+	// Simple Shader
+	mDefaultProgram = RenderProgram("data/shaders/vs_simple.glsl", "data/shaders/fs_simple.glsl");
+	bool load_result = mDefaultProgram.Load();
 	assert(load_result);
+	muDefaultModelViewProjection = mDefaultProgram.GetUniformLocation("uModelViewProj");	
+	muDefaultColor = mDefaultProgram.GetUniformLocation("uColor");	
 
 	// Render Target
 	mRenderTarget = RenderTarget (width, height, RenderTarget::EnableColor | RenderTarget::EnableDepthTexture);
@@ -151,23 +153,18 @@ glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data
 	mRenderQuadProgramColor = RenderProgram("data/shaders/vs_passthrough.glsl", "data/shaders/fs_simpletexture.glsl");
 	load_result = mRenderQuadProgramColor.Load();
 	assert(load_result);
-	muRenderQuadModelViewProj = glGetUniformLocation(mRenderQuadProgramColor.mProgramId, "uModelViewProj");	
-	gLog("muRenderQuadModelViewProj %d", muRenderQuadModelViewProj);
-	muRenderQuadTexture = glGetUniformLocation(mRenderQuadProgramColor.mProgramId, "uTexture");	
-	gLog("muRenderQuadTexture %d", muRenderQuadTexture );
-	muRenderQuadTime = glGetUniformLocation(mRenderQuadProgramColor.mProgramId, "uTime");	
-	gLog("muRenderQuadTime %d", muRenderQuadTime);
+	muRenderQuadModelViewProj = mRenderQuadProgramColor.GetUniformLocation("uModelViewProj");
+		
+	muRenderQuadTexture = mRenderQuadProgramColor.GetUniformLocation("uTexture");
+	muRenderQuadTime = mRenderQuadProgramColor.GetUniformLocation("uTime");	
 
 	// Program for depth texture rendering
 	mRenderQuadProgramDepth = RenderProgram("data/shaders/vs_passthrough.glsl", "data/shaders/fs_depthbuffer.glsl");
 	load_result = mRenderQuadProgramDepth.Load();
 	assert(load_result);
-	muRenderQuadDepthModelViewProj = glGetUniformLocation(mRenderQuadProgramDepth.mProgramId, "uModelViewProj");
-	gLog("muModelViewProj %d", muRenderQuadDepthModelViewProj);
-	muRenderQuadDepthNear = glGetUniformLocation(mRenderQuadProgramDepth.mProgramId, "uNear");	
-	gLog("muRenderQuadDepthNear %d", muRenderQuadDepthNear);
-	muRenderQuadDepthFar = glGetUniformLocation(mRenderQuadProgramDepth.mProgramId, "uFar");	
-	gLog("muRenderQuadDepthFar %d", muRenderQuadDepthFar);
+	muRenderQuadDepthModelViewProj = mRenderQuadProgramDepth.GetUniformLocation( "uModelViewProj");
+	muRenderQuadDepthNear = mRenderQuadProgramDepth.GetUniformLocation("uNear");	
+	muRenderQuadDepthFar = mRenderQuadProgramDepth.GetUniformLocation("uFar");	
 }
 
 void Renderer::Shutdown() {
@@ -181,6 +178,10 @@ void Renderer::RenderGl() {
 	if (width != mWidth || height != mHeight)
 		Resize(width, height);
 
+	mCamera.mtxProj = Ortho(-1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f);
+
+	Matrix44f model_view_projection = mCamera.mtxProj * mCamera.mtxView;
+
 	// enable the render target
 	glBindFramebuffer(GL_FRAMEBUFFER, mRenderTarget.mFrameBufferId);
 	GLenum DrawBuffers[1] = { GL_COLOR_ATTACHMENT0 };
@@ -194,7 +195,10 @@ void Renderer::RenderGl() {
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 	glEnable(GL_DEPTH_TEST);
 
-	glUseProgram(mProgram.mProgramId);
+	glUseProgram(mDefaultProgram.mProgramId);
+	glUniformMatrix4fv(muDefaultModelViewProjection, 1, GL_FALSE, model_view_projection.data());
+	glUniform4fv(muDefaultColor, 1, Vector4f(1.0f, 0.0f, 0.0f, 1.0f).data());
+	glUniformMatrix4fv(muDefaultModelViewProjection, 1, GL_FALSE, model_view_projection.data());
 
 	glEnableVertexAttribArray(0);
 	glBindBuffer(GL_ARRAY_BUFFER, mMesh.mVertexBuffer);

src/modules/RenderModule.h

@@ -113,7 +113,11 @@ struct Renderer {
 
 	Camera mCamera;
 	Mesh mMesh;
-	RenderProgram mProgram;
+
+	RenderProgram mDefaultProgram;
+	GLuint muDefaultModelViewProjection;
+	GLuint muDefaultColor;
+
 	RenderTarget mRenderTarget;
 
 	GLuint mRenderQuadVertexArrayId;

src/modules/RenderUtils.cc

@@ -102,7 +102,6 @@ bool RenderProgram::Load() {
 		gLog("%s", &ProgramErrorMessage[0]);
 	}
 
-
 	glDetachShader(ProgramID, VertexShaderID);
 	glDetachShader(ProgramID, FragmentShaderID);
 
@@ -113,6 +112,30 @@ bool RenderProgram::Load() {
 	return true;
 }
 
+GLuint RenderProgram::GetUniformLocation(const std::string& name) {
+	if (mProgramId == -1) {
+		gLog("Cannot get uniform '%s' for program '%s' and '%s': shader not valid.", 
+				name.c_str(),
+				mVertexShaderFilename.c_str(),
+				mFragmentShaderFilename.c_str()
+				);
+		assert(mProgramId != -1);
+	}
+	GLuint result = glGetUniformLocation(mProgramId, name.c_str());
+	if (result == -1) {
+		gLog ("Error loading uniform '%s' from shaders '%s' and '%s': uniform not found.",
+				name.c_str(),
+				mVertexShaderFilename.c_str(), 
+				mFragmentShaderFilename.c_str()
+				);
+		assert(false);
+	} else {
+		gLog ("Uniform '%s': %d", name.c_str(), result);
+	}
+
+	return result;
+}
+
 //
 // RenderTarget
 //

src/modules/RenderUtils.h

@@ -139,6 +139,8 @@ struct RenderProgram {
 		mFragmentShaderFilename(fs)
 	{}
 
+	GLuint GetUniformLocation(const std::string& name);
+
 	~RenderProgram();
 
 	bool Load();