private void PlatformCreateShaders()
{
GLDebug.CheckAccess();
var vertexShaderHandle = GL.CreateShader(ShaderType.VertexShader);
var fragmentShaderHandle = GL.CreateShader(ShaderType.FragmentShader);
GL.ShaderSource(vertexShaderHandle, vertexShaderSource);
GL.ShaderSource(fragmentShaderHandle, fragmentShaderSource);
GL.CompileShader(vertexShaderHandle);
GL.CompileShader(fragmentShaderHandle);
// Create program
shaderProgramHandle = GL.CreateProgram();
GL.AttachShader(shaderProgramHandle, vertexShaderHandle);
GL.AttachShader(shaderProgramHandle, fragmentShaderHandle);
GL.BindAttribLocation(shaderProgramHandle, 0, "in_position");
GL.BindAttribLocation(shaderProgramHandle, 1, "in_color");
GL.BindAttribLocation(shaderProgramHandle, 2, "in_uv");
GL.LinkProgram(shaderProgramHandle);
Debug.WriteLine(GL.GetProgramInfoLog(shaderProgramHandle));
GL.UseProgram(shaderProgramHandle);
// Set uniforms
transformLocation = GL.GetUniformLocation(shaderProgramHandle, "transform");
}
private void PlatformDispose()
{
GLDebug.CheckAccess();
GL.DeleteBuffer(vertexBufferId);
GL.DeleteProgram(shaderProgramHandle);
}
private Texture PlatformCreateTexture(TextureContent data)
{
GLDebug.CheckAccess();
var texture = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, texture);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height, 0, PixelFormat.Bgra, PixelType.UnsignedByte, data.Pixels);
return(new Texture(texture, data.Width, data.Height, data.Left, data.Right, data.Top, data.Bottom, data.IsTransparent));
}
private unsafe void PlatformDraw(Vertex *pVertex, ushort *pIndex, int vertexCount, int indexCount, int texture, bool isTransparent)
{
GLDebug.CheckAccess();
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(vertexCount * Vertex.SizeInBytes), (IntPtr)pVertex, BufferUsageHint.StaticDraw);
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(indexCount * sizeof(ushort)), (IntPtr)pIndex, BufferUsageHint.StaticDraw);
GL.BindTexture(TextureTarget.Texture2D, texture);
if (isTransparent)
{
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.One, BlendingFactorDest.OneMinusSrcAlpha);
}
else
{
GL.Disable(EnableCap.Blend);
}
GL.DrawElements(BeginMode.Triangles, indexCount, DrawElementsType.UnsignedShort, 0);
}
private unsafe void PlatformBeginDraw(ref Matrix4x4 projection)
{
GLDebug.CheckAccess();
GL.UseProgram(shaderProgramHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, vertexBufferId);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, indexBufferId);
GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, Vertex.SizeInBytes, 0);
GL.VertexAttribPointer(1, 4, VertexAttribPointerType.UnsignedByte, true, Vertex.SizeInBytes, 8);
GL.VertexAttribPointer(2, 2, VertexAttribPointerType.Float, false, Vertex.SizeInBytes, 8 + 4);
GL.EnableVertexAttribArray(0);
GL.EnableVertexAttribArray(1);
GL.EnableVertexAttribArray(2);
fixed(float *ptr = &projection.M11)
{
GL.UniformMatrix4(transformLocation, 1, false, ptr);
}
}
private void PlatformCreateBuffers()
{
GLDebug.CheckAccess();
vertexBufferId = GL.GenBuffer();
}