Can render color and depth buffer

data/shaders/fs_simpletexture.glsl

@@ -14,4 +14,6 @@ void main() {
 		cos(time + 768.0  * uv.y)
 		)
 	).xyz;
+	color = vec3((texture(rendered_texture, uv).x + 1) * 0.5 );
+//	* 1 * (cos(time * 0.3) * 0.5) + 0.5);
 }

src/modules/RenderModule.cc

@@ -7,7 +7,7 @@ struct Renderer;
 
 static const GLfloat g_vertex_buffer_data[] = {
 	-1.0f, -1.0f, 0.0f,
-	1.0f, -1.0f, 0.0f,
+	1.0f, -1.0f, -1.2f,
 	0.0f, 1.0f, 0.0f
 };
 
@@ -135,7 +135,7 @@ glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data
 	assert(load_result);
 
 	// Render Target
-	mRenderTarget = RenderTarget (width, height, RenderTarget::EnableColor | RenderTarget::EnableDepth);
+	mRenderTarget = RenderTarget (width, height, RenderTarget::EnableColor | RenderTarget::EnableDepthTexture);
 
 	// Render Target Quad
 	glGenVertexArrays(1, &mRenderQuadVertexArrayId);
@@ -174,6 +174,7 @@ void Renderer::RenderGl() {
 
 	// clear color and depth
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glEnable(GL_DEPTH_TEST);
 
 	glUseProgram(mProgram.mProgramId);
 
@@ -201,8 +202,9 @@ void Renderer::RenderGui() {
 
 	glActiveTexture(GL_TEXTURE0);
 	glBindTexture(GL_TEXTURE_2D, mRenderTarget.mColorTexture);
+//	glBindTexture(GL_TEXTURE_2D, mRenderTarget.mDepthTexture);
 	glUniform1i(muRenderQuadTexture, 0);
-	glUniform1f(muRenderQuadTime, 0.0f * (float)(glfwGetTime() * 10.0f));
+	glUniform1f(muRenderQuadTime, (float)(glfwGetTime() * 10.0f));
 
 	glEnableVertexAttribArray(0);
 	glBindBuffer(GL_ARRAY_BUFFER, mRenderQuadVertexBufferId);
@@ -217,7 +219,6 @@ void Renderer::RenderGui() {
 
 	glDrawArrays(GL_TRIANGLES, 0, 6);	// starting from vertex 0; 3 vertices total
 	glDisableVertexAttribArray(0);
-
 }
 
 void Renderer::Resize (int width, int height) {

src/modules/RenderUtils.cc

@@ -138,6 +138,11 @@ void RenderTarget::Cleanup() {
 		mColorTexture = -1;
 	}
 
+	if (mDepthTexture!= -1) {
+		glDeleteTextures(1, &mDepthTexture);
+		mDepthTexture = -1;
+	}
+
 	if (mDepthBuffer != -1) {
 		glDeleteRenderbuffers(1, &mDepthBuffer);
 		mDepthBuffer = -1;
@@ -168,13 +173,27 @@ void RenderTarget::Resize(int width, int height) {
 		glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, mColorTexture, 0);
 	}
 
-	if (mFlags & EnableDepth) {
+	if (mFlags & EnableDepthTexture) {
+		assert((mFlags & EnableDepth) == false);
+
+		glGenTextures(1, &mDepthTexture);
+		glBindTexture(GL_TEXTURE_2D, mDepthTexture);
+
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, mWidth, mHeight, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
+
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+		glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, mDepthTexture, 0);
+	} else if (mFlags & EnableDepth) {
+		assert((mFlags & EnableDepthTexture) == false);
 		glGenRenderbuffers(1, &mDepthBuffer);
 		glBindRenderbuffer(GL_RENDERBUFFER, mDepthBuffer);
 		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, mWidth, mHeight);
 		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, mDepthBuffer);
 	}
-
 }
 
 

src/modules/RenderUtils.h

@@ -150,10 +150,12 @@ struct RenderTarget {
 	GLuint mFrameBufferId = -1;
 	GLuint mColorTexture = -1;
 	GLuint mDepthBuffer = -1;
+	GLuint mDepthTexture = -1;
 
 	typedef enum {
 		EnableColor = 1,
-		EnableDepth = 2
+		EnableDepth = 2,
+		EnableDepthTexture = 4
 	} Flags;
 
 	int mFlags = 0;