private void BasicVis_RenderFrame(object sender, FrameEventArgs e)
{
OpenGLUtil.UseFrameBuffer(frameBufferID); // render to our custom framebuffer
GL.Viewport(0, 0, 1024, 1024); // render on teh entire framebuffer
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit); // clear the screen
depthProgram.UseProgram(); // use the depth program
// camera properties
Matrix4 proj = Matrix4.CreateOrthographic(100, 100, 0, 100);
Matrix4 view = Matrix4.LookAt(new Vector3(4, 3, 3), Vector3.Zero, new Vector3(0, 1, 0));
Matrix4 model = Matrix4.Identity;
depthProgram.SetMVP(model * view * proj);
depthProgram.EnableAttributes();
depthProgram.LoadBuffer(vertexBufferID);
GL.DrawArrays(PrimitiveType.Triangles, 0, vertexBufferData.Length); // here the fragment shader will automatically write the depth to the texture bc of location 0
depthProgram.DisableAttributes();
OpenGLUtil.UseFrameBuffer(0); // now render to the screen
GL.Viewport(0, 0, Width, Height);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit); // clear the screen
textureProgram.UseProgram(); // use the texture program to display the 2d texture
textureProgram.SetTexture(textureID);
textureProgram.EnableAttributes();
textureProgram.LoadBuffer(vertexBufferID); // load the positions so that it can use them to map to the UV coordinates
GL.DrawArrays(PrimitiveType.Triangles, 0, vertexBufferData.Length);
textureProgram.DisableAttributes();
SwapBuffers();
}
// for debugging
private void RenderDepthToScreen()
{
OpenGLUtil.UseFrameBuffer(0); // now render to the screen
GL.Viewport(0, 0, 512, 512); // in the corner
//GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit); // clear the screen
textureProgram.UseProgram(); // use the texture program to display the 2d texture
textureProgram.SetTexture(openGLLights[1].ShadowMapID);
textureProgram.EnableAttributes();
textureProgram.LoadBuffer(vertexBufferID); // load the positions so that it can use them to map to the UV coordinates
OpenGLUtil.DisableTextureCompare(openGLLights[1].ShadowMapID);
GL.DrawArrays(PrimitiveType.Triangles, 0, totalNumVerts);
OpenGLUtil.EnableTextureCompare(openGLLights[1].ShadowMapID);
textureProgram.DisableAttributes();
}