// This gets called when the drawing surface is ready
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
GL.BlendFunc(All.SrcAlpha, All.OneMinusSrcAlpha);
GL.Enable(All.Blend);
LoadShaders();
int width, height = 0;
// load the etc1
texture = GLSupport.LoadETC1TextureFromAssets("f_spot.etc1", out width, out height);
// load the alpha
alpha = GLSupport.LoadAlphaTextureFromAssets("f_spot.alpha", width, height);
// Run the render loop
Run();
}
bool LoadShaders()
{
int vertShader, fragShader;
// Create shader program.
program = GL.CreateProgram();
// Create and compile vertex shader.
var vertShaderPathname = "Shader.vsh";
if (!GLSupport.CompileShader(ShaderType.VertexShader, vertShaderPathname, out vertShader))
{
System.Diagnostics.Debug.WriteLine("Failed to compile vertex shader");
return(false);
}
// Create and compile fragment shader.
var fragShaderPathname = "Shader.fsh";
if (!GLSupport.CompileShader(ShaderType.FragmentShader, fragShaderPathname, out fragShader))
{
System.Diagnostics.Debug.WriteLine("Failed to compile fragment shader");
return(false);
}
// Attach vertex shader to program.
GL.AttachShader(program, vertShader);
// Attach fragment shader to program.
GL.AttachShader(program, fragShader);
// Bind attribute locations.
// This needs to be done prior to linking.
GL.BindAttribLocation(program, ATTRIB_VERTEX, "position");
GL.BindAttribLocation(program, ATTRIB_TEXTURECOORD, "a_TexCoordinate");
// Link program.
if (!GLSupport.LinkProgram(program))
{
System.Diagnostics.Debug.WriteLine("Failed to link program: {0:x}", program);
if (vertShader != 0)
{
GL.DeleteShader(vertShader);
}
if (fragShader != 0)
{
GL.DeleteShader(fragShader);
}
if (program != 0)
{
GL.DeleteProgram(program);
program = 0;
}
return(false);
}
// Get uniform locations.
uniforms [UNIFORM_TRANSLATE] = GL.GetUniformLocation(program, new StringBuilder("translate"));
uniforms [UNIFORM_TEXTURE] = GL.GetUniformLocation(program, new StringBuilder("u_Texture"));
uniforms [UNIFORM_ALPHA] = GL.GetUniformLocation(program, new StringBuilder("u_Alpha"));
// Release vertex and fragment shaders.
if (vertShader != 0)
{
GL.DetachShader(program, vertShader);
GL.DeleteShader(vertShader);
}
if (fragShader != 0)
{
GL.DetachShader(program, fragShader);
GL.DeleteShader(fragShader);
}
return(true);
}
