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;
}
