void RenderToScreen() { Mesh mesh = quadMesh; ProgramDeprecated program = texturedProgram; MeshMode meshMode = MeshMode.PolygonFill; GL.ClearColor(0.5f, 0.5f, 0.5f, 1.0f); GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit | ClearBufferMask.StencilBufferBit); UseViewport(windowViewport); program.Use(); // We animate one uniform every frame, so we also need to upload uniforms // This covers changes to camera uniforms caused by resizes double time = (double)(System.Environment.TickCount); float t = (float)(System.Math.Sin(time * 0.01) * 0.5f + 0.5f); (parameters["t"] as Floats).Set(t); program.ApplyUniforms(); var attributeBindings = mesh.AttributeBindings(program, meshMode); SetupAttributeBindings(attributeBindings); EnsureUploaded(mesh); BufferRange vertexBufferRange = mesh.VertexBufferRange; BufferRange indexBufferRange = mesh.IndexBufferRange(MeshMode.PolygonFill); GL.DrawElementsBaseVertex( indexBufferRange.BeginMode, (int)indexBufferRange.Count, indexBufferRange.Buffer.DrawElementsType, (IntPtr)(indexBufferRange.OffsetBytes), vertexBufferRange.BaseVertex ); DisableAttributeBindings(attributeBindings); }
protected override void OnLoad(System.EventArgs e) { // Check GL version and feature capabilities RenderStack.Graphics.Configuration.Initialize(); if (RenderStack.Graphics.Configuration.canUseFramebufferObject == false) { throw new System.PlatformNotSupportedException( "GL version 3.0 or GL_ARB_framebuffer_object extension is needed. Neither was found." ); } if (RenderStack.Graphics.Configuration.canUseBaseVertex == false) { throw new System.PlatformNotSupportedException( "GL version 3.2 or GL_ARB_draw_elements_base_vertex extension is needed. Neither was found." ); } sphereMesh = new GeometryMesh(new Sphere(2.00f, 20, 20), NormalStyle.PointNormals).GetMesh; quadMesh = new GeometryMesh(new QuadXY(1.0f, 1.0f, 0.0f), NormalStyle.PolygonNormals).GetMesh; // Initialize shared resources attributeMappings.Add("_position", VertexUsage.Position, 0, 3); attributeMappings.Add("_normal", VertexUsage.Normal, 0, 3); attributeMappings.Add("_texcoord", VertexUsage.TexCoord, 0, 2); UniformMappings.Add("_model_to_world_matrix", LogicalUniform.ModelToWorld); UniformMappings.Add("_world_to_model_matrix", LogicalUniform.WorldToModel); UniformMappings.Add("_model_to_clip_matrix", LogicalUniform.ModelToClip); UniformMappings.Add("_clip_to_model_matrix", LogicalUniform.ClipToModel); UniformMappings.Add("_world_to_clip_matrix", LogicalUniform.WorldToClip); UniformMappings.Add("_clip_to_world_matrix", LogicalUniform.ClipToWorld); UniformMappings.Add("_view_position_in_world", LogicalUniform.ViewPositionInWorld); UniformMappings.Add <Floats>("_light_direction", "light_direction"); UniformMappings.Add <Floats>("_light_color", "light_color"); UniformMappings.Add <Floats>("_surface_color", "surface_color"); UniformMappings.Add <Texture>("_texture", "texture"); UniformMappings.Add <Floats> ("_t", "t"); parameters["surface_color"] = new Floats(1.0f, 1.0f, 1.0f); parameters["light_direction"] = new Floats(0.0f, 1.0f, 0.0f); parameters["light_color"] = new Floats(1.0f, 1.0f, 1.0f); parameters["t"] = new Floats(0.5f); // Initialize resources used by the first pass (render to texture) framebuffer = new Framebuffer(128, 128); framebuffer.AttachTexture(FramebufferAttachment.ColorAttachment0, PixelFormat.Rgb, PixelInternalFormat.Rgb8); framebuffer.AttachRenderBuffer(FramebufferAttachment.DepthAttachment, PixelFormat.DepthComponent, RenderbufferStorage.DepthComponent32, 0); framebuffer.Begin(); framebuffer.Check(); framebuffer.End(); cameraOne.Frame.LocalToParent.Set( Matrix4.CreateLookAt( new Vector3(0.0f, 0.0f, -4.0f), new Vector3(0.0f, 0.0f, 0.0f), new Vector3(0.0f, 1.0f, 0.0f) ) ); cameraOne.FovYRadians = RenderStack.Math.Conversions.DegreesToRadians(60.0f); cameraOne.ProjectionType = ProjectionType.PerspectiveVertical; ulong updateSerial = 1; cameraOne.Frame.UpdateHierarchical(updateSerial); quadFrame.UpdateHierarchical(updateSerial); cameraOne.UpdateFrame(); cameraOne.UpdateViewport(framebuffer); cameraOne.UpdateModelFrame(quadFrame); if (RenderStack.Graphics.Configuration.glslVersion >= 330) { diffuseProgram = new ProgramDeprecated(vsDiffuse330, fsDiffuse330); } else { diffuseProgram = new ProgramDeprecated(vsDiffuse120, fsDiffuse120); } diffuseProgram.AttributeMappings = attributeMappings; diffuseProgram.Bind(cameraOne); diffuseProgram.Bind(parameters); // Initialize resources used by the second pass (render to screen, using texture) windowViewport = new Viewport(base.Width, base.Height); cameraTwo.Frame.LocalToParent.Set( Matrix4.CreateLookAt( new Vector3(0.0f, 0.0f, -2.0f), new Vector3(0.0f, 0.0f, 0.0f), new Vector3(0.0f, 1.0f, 0.0f) ) ); cameraTwo.FovYRadians = RenderStack.Math.Conversions.DegreesToRadians(60.0f); cameraTwo.ProjectionType = ProjectionType.PerspectiveVertical; cameraTwo.Frame.UpdateHierarchical(updateSerial); sphereFrame.UpdateHierarchical(updateSerial); cameraTwo.UpdateFrame(); cameraTwo.UpdateViewport(windowViewport); cameraTwo.UpdateModelFrame(sphereFrame); parameters["texture"] = framebuffer[FramebufferAttachment.ColorAttachment0]; if (RenderStack.Graphics.Configuration.glslVersion >= 330) { texturedProgram = new ProgramDeprecated(vsTextured330, fsTextured330); } else { texturedProgram = new ProgramDeprecated(vsTextured120, fsTextured120); } texturedProgram.AttributeMappings = attributeMappings; texturedProgram.Bind(cameraTwo); texturedProgram.Bind(parameters); diffuseProgram.Use(); diffuseProgram.ApplyUniforms(); texturedProgram.Use(); texturedProgram.ApplyUniforms(); EnsureUploaded(sphereMesh); EnsureUploaded(quadMesh); // Setup some GL state GL.Enable(EnableCap.DepthTest); GL.Enable(EnableCap.CullFace); Resize += new EventHandler <EventArgs>(Application_Resize); Unload += new EventHandler <EventArgs>(Application_Unload); GL.ClearColor(0.5f, 0.5f, 0.5f, 1.0f); GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit | ClearBufferMask.StencilBufferBit); SwapBuffers(); Visible = true; }