well in that case

src/preview_renderer/renderer.cpp

@@ -7,11 +7,27 @@
 #include <scene/material.hpp>
 #include <scene/mesh.hpp>
 
+#include <iostream>
+
 using namespace inferno;
 
 RasterizeRenderer::RasterizeRenderer()
 {
+    glGenFramebuffers(1, &mRenderTarget);
+    glBindFramebuffer(GL_FRAMEBUFFER, mRenderTarget);
 
+    glGenTextures(1, &mRenderTargetTexture);
+    glBindTexture(GL_TEXTURE_2D, mRenderTargetTexture);
+    
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 800, 600, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);  
+
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, mRenderTargetTexture, 0);  
+
+    assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);  
 }
 
 RasterizeRenderer::~RasterizeRenderer()
@@ -24,18 +40,34 @@ void RasterizeRenderer::setScene(Scene* scene)
     mCurrentScene = scene;
 }
 
-void RasterizeRenderer::setTarget(GLuint renderTarget)
+void RasterizeRenderer::setTargetSize(glm::vec2 size)
 {
+    mRenderTargetSize = size;
+}
 
+GLuint RasterizeRenderer::getRenderedTexture()
+{
+    return mRenderTarget;
+}
+
+glm::vec2 RasterizeRenderer::getTargetSize()
+{
+    return mRenderTargetSize;
 }
 
 void RasterizeRenderer::prepare()
 {
-
+    glBindFramebuffer(GL_FRAMEBUFFER, mRenderTarget);
+    glClearColor(0.1, 0.1, 0.1, 1.0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
 
 void RasterizeRenderer::draw()
 {
+    glBindFramebuffer(GL_FRAMEBUFFER, mRenderTarget);
+    glViewport(0, 0, mRenderTargetSize.x, mRenderTargetSize.y);
+
     for (Mesh* m : mCurrentScene->getRenderables())
     {
 	    m->getMaterial()->getGlShader()->use();
@@ -53,4 +85,6 @@ void RasterizeRenderer::draw()
 
         glDrawElements(GL_TRIANGLES, m->getIndexCount() * sizeof(uint32_t), GL_UNSIGNED_INT, 0);
     }
+    
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }