added a few missing lines

opengl-test-two/main.cpp

@@ -148,6 +148,48 @@ GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path
 	return ProgramID;
 }
 
+GLuint WriteTexture(int textw, int texth){
+    // The framebuffer, which regroups 0, 1, or more textures, and 0 or 1 depth buffer.
+    GLuint FramebufferName = 0;
+    glGenFramebuffers(1, &FramebufferName);
+    glBindFramebuffer(GL_FRAMEBUFFER, FramebufferName);
+
+    // The texture we're going to render to
+    GLuint renderedTexture;
+    glGenTextures(1, &renderedTexture);
+
+    // "Bind" the newly created texture : all future texture functions will modify this texture
+    glBindTexture(GL_TEXTURE_2D, renderedTexture);
+
+    // Give an empty image to OpenGL ( the last "0" )
+    glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, textw, texth, 0,GL_RGB, GL_UNSIGNED_BYTE, 0);
+
+    // Poor filtering. Needed !
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+    // The depth buffer -- OPTIONAL, REMOVE WHEN NOT NEEDED
+    GLuint depthrenderbuffer;
+    glGenRenderbuffers(1, &depthrenderbuffer);
+    glBindRenderbuffer(GL_RENDERBUFFER, depthrenderbuffer);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, 1024, 768);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthrenderbuffer);
+
+    // Set "renderedTexture" as our colour attachement #0
+    glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, renderedTexture, 0);
+
+    // Set the list of draw buffers.
+    GLenum DrawBuffers[1] = {GL_COLOR_ATTACHMENT0};
+    glDrawBuffers(1, DrawBuffers); // "1" is the size of DrawBuffers
+
+    // Always check that our framebuffer is ok
+    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+        return false;
+
+    // Render to our framebuffer
+    glBindFramebuffer(GL_FRAMEBUFFER, FramebufferName);
+    glViewport(0, 0, textw, texth);
+}
 
 
 int main(int argc, char* args[]) {

opengl-test-two/trimap.fragmentshader

@@ -4,7 +4,8 @@
 in vec2 UV;
 
 // Ouput data
-out vec3 color;
+//out vec3 color;
+layout(location = 0) out vec3 color;
 
 // Values that stay constant for the whole mesh.
 uniform sampler2D myTextureSampler;