//lightCam是我们定义的一个Camera类，此处代表Projector
public void SetupMatrix(Projector proj)
{
gl.MatrixMode(OpenGL.GL_TEXTURE_MATRIX);
gl.LoadIdentity();
gl.PushMatrix();
float[] biasMatrix = {
0.5f, 0.0f, 0.0f, 0.0f,
0.0f, 0.5f, 0.0f, 0.0f,
0.0f, 0.0f, 0.5f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f
};
//获得Projector的模型视图矩阵，用于把world space的顶点转换到projector space
//获得Projector的投影矩阵，用于把projector space的顶点转换到projector clip space
gl.LoadMatrixf(biasMatrix);
gl.MultMatrix(proj.projMatrix);
gl.MultMatrix(proj.modelviewMatrix);
gl.GetFloat(OpenGL.GL_CURRENT_MATRIX_ARB, matrix); //获得纹理矩阵
gl.PopMatrix();
}
/// <summary>
/// Handles the OpenGLInitialized event of the openGLControl control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.EventArgs"/> instance containing the event data.</param>
private void openGLControl_OpenGLInitialized(object sender, EventArgs e)
{
// Get the OpenGL object.
OpenGL gl = openGLControl.OpenGL;
// Initial texture projector.
projTexture = new ProjectiveTexture(gl);
projector = new Projector();
// Initial something for creating texture.
gl.GenTextures(1, texture_name);
gl.BindTexture(OpenGL.GL_TEXTURE_2D, texture_name[0]);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MAG_FILTER, OpenGL.GL_LINEAR);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MIN_FILTER, OpenGL.GL_LINEAR_MIPMAP_LINEAR);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_S, OpenGL.GL_CLAMP_TO_EDGE);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_T, OpenGL.GL_CLAMP_TO_EDGE);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_GENERATE_MIPMAP_HINT_SGIS, OpenGL.GL_TRUE); // automatic mipmap generation included in OpenGL v1.4
gl.TexImage2D(OpenGL.GL_TEXTURE_2D,
0, (int)OpenGL.GL_RGBA8, TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, OpenGL.GL_RGBA, OpenGL.GL_UNSIGNED_BYTE, null);
gl.BindTexture(OpenGL.GL_TEXTURE_2D, 0);
// InitFBO
// create a framebuffer object, you need to delete them when program exits.
gl.GenFramebuffersEXT(1, framebuffer_name);
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, framebuffer_name[0]);
// create a renderbuffer object to store depth info
// NOTE: A depth renderable image should be attached the FBO for depth test.
// If we don't attach a depth renderable image to the FBO, then
// the rendering output will be corrupted because of missing depth test.
// If you also need stencil test for your rendering, then you must
// attach additional image to the stencil attachement point, too.
gl.GenRenderbuffersEXT(1, renderbuffer_name);
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER_EXT, renderbuffer_name[0]);
gl.RenderbufferStorageEXT(OpenGL.GL_RENDERBUFFER_EXT, OpenGL.GL_DEPTH_COMPONENT, TEXTURE_WIDTH, TEXTURE_HEIGHT);
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER_EXT, 0);
// attach a texture to FBO color attachement point
gl.FramebufferTexture2DEXT(OpenGL.GL_FRAMEBUFFER_EXT,
OpenGL.GL_COLOR_ATTACHMENT0_EXT, OpenGL.GL_TEXTURE_2D, texture_name[0], 0);
// attach a renderbuffer to depth attachment point
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT,
OpenGL.GL_DEPTH_ATTACHMENT_EXT, OpenGL.GL_RENDERBUFFER_EXT, renderbuffer_name[0]);
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, 0);
// initial projection matrix
gl.MatrixMode(OpenGL.GL_PROJECTION);
// Create a perspective transformation.
gl.Perspective(60.0f, (double)Width / (double)Height, 0.01, 100.0);
// Use the 'look at' helper function to position and aim the camera.
gl.LookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
// Set the clear color.
gl.ClearColor(0, 0, 0, 0);
}
