public DepthPeeling(Mesh mesh)
{
gl.create_shader_program(null, meshVertexShader, meshFragmentShader, out scene_p_id);
gl.create_shader_program(null, tex_v_shader, tex_f_shader, out tex_p_id);
var aabb = mesh.GetAxisAlignedBoundingBox();
mesh.Translate(-aabb.Center);
mesh.Transform(Matrix4X4.CreateRotation(new Vector3(23, 51, 12)));
mesh.Transform(Matrix4X4.CreateScale(1 / Math.Max(aabb.XSize, Math.Max(aabb.YSize, aabb.ZSize)) / 2));
var screenQuad = new Mesh();
screenQuad.CreateFace(new Vector3[]
{
new Vector3(-1, -1, 0),
new Vector3(1, -1, 0),
new Vector3(1, 1, 0),
new Vector3(-1, 1, 0)
});
screenQuadVao = GLMeshVertexArrayObjectPlugin.Get(screenQuad);
}
// Main display routine
public void glutDisplayFunc(WorldView worldView, IObject3D item)
{
var mesh = item.Mesh;
var meshVao = GLMeshVertexArrayObjectPlugin.Get(mesh);
GL.PushAttrib(AttribMask.EnableBit | AttribMask.ViewportBit | AttribMask.TransformBit);
// Projection and modelview matrices
float near = 0.01f;
float far = 20;
var top = Math.Tan(35.0 / 360.0 * Math.PI) * near;
var right = top * w / h;
var proj = Matrix4X4.Frustum(-right, right, -top, top, near, far);
// spin around
var model = Matrix4X4.CreateRotationY(Math.PI / 180.0 * count++) * Matrix4X4.CreateTranslation(0, 0, -1.5);
//proj = worldView.ProjectionMatrix;
//model = worldView.ModelviewMatrix;
gl.Enable(GL.DEPTH_TEST);
gl.Viewport(0, 0, w, h);
// select program and attach uniforms
gl.UseProgram(scene_p_id);
int proj_loc = gl.GetUniformLocation(scene_p_id, "proj");
gl.UniformMatrix4fv(proj_loc, 1, GL.FALSE, proj.GetAsFloatArray());
int model_loc = gl.GetUniformLocation(scene_p_id, "model");
gl.UniformMatrix4fv(model_loc, 1, GL.FALSE, model.GetAsFloatArray());
gl.Uniform1f(gl.GetUniformLocation(scene_p_id, "width"), w);
gl.Uniform1f(gl.GetUniformLocation(scene_p_id, "height"), h);
gl.BindVertexArray(meshVao.Vao);
gl.Disable(GL.BLEND);
for (int pass = 0; pass < renderPasses; pass++)
{
int first_pass = pass == 0 ? 1 : 0;
gl.Uniform1i(gl.GetUniformLocation(scene_p_id, "first_pass"), first_pass);
if (first_pass == 0)
{
gl.Uniform1i(gl.GetUniformLocation(scene_p_id, "depth_texture"), 0);
gl.ActiveTexture(GL.TEXTURE0 + 0);
GL.BindTexture(TextureTarget.Texture2D, depthTexture[pass - 1]);
}
gl.BindFramebuffer(GL.FRAMEBUFFER, frameBufferObject[pass]);
gl.ClearColor(0.0, 0.4, 0.7, 0.0);
gl.Clear(GL.COLOR_BUFFER_BIT | GL.DEPTH_BUFFER_BIT);
gl.DrawElements(GL.TRIANGLES, mesh.Faces.Count * 3, GL.UNSIGNED_INT, IntPtr.Zero);
}
// clean up and set to render to screen
gl.BindVertexArray(0);
gl.BindFramebuffer(GL.FRAMEBUFFER, 0);
gl.ActiveTexture(GL.TEXTURE0 + 0);
GL.BindTexture(TextureTarget.Texture2D, 0);
gl.ClearColor(0.0, 0.4, 0.7, 0.0);
gl.Clear(GL.COLOR_BUFFER_BIT | GL.DEPTH_BUFFER_BIT);
for (int pass = 0; pass < renderPasses; pass++)
{
RenderLayer(pass);
}
RenderFinal();
gl.DepthFunc(GL.LESS);
GL.PopAttrib();
gl.BindVertexArray(0);
GL.BindTexture(TextureTarget.Texture2D, 0);
gl.UseProgram(0);
}