public static void DrawSprite(uint texId, Rectangle rect, Matrix4 mat, float[] texCoords, Vector4 colorScale)
{
float x = rect.X;
float y = rect.Y;
float width = rect.Width;
float height = rect.Height;
float[] Vertices =
{
x + width, y,
x + width, y + height,
x, y,
x, y + height
};
if (texCoords == null)
{
float[] tx = { 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f };
texCoords = tx;
}
GLHelper.GetError();
TextureShader shader = TextureShader.Singleton;
// Use shader
GL.UseProgram(shader.mProgram);
shader.SetColorScale(colorScale);
// Set texture
GL.ActiveTexture(TextureUnit.Texture0); // Set active texture slot to 0
GL.BindTexture(TextureTarget.Texture2D, texId); // Bind 2D texture to current slot
GL.Uniform1(shader.muTextureHandle, 0); // Set shader sampler to texture slot 0
// Set Model view
GL.UniformMatrix4(shader.muMVPMatrixHandle, 1, false, ref mat.Row0.X);
// Set vertex and texture coords
GL.EnableVertexAttribArray(shader.maPositionHandle);
GL.EnableVertexAttribArray(shader.maTexCoordHandle);
GL.VertexAttribPointer(shader.maPositionHandle, 2, VertexAttribPointerType.Float, false, 0, Vertices);
GL.VertexAttribPointer(shader.maTexCoordHandle, 2, VertexAttribPointerType.Float, false, 0, texCoords);
GL.DrawArrays(BeginMode.TriangleStrip, 0, 4);
GL.DisableVertexAttribArray(shader.maPositionHandle);
GL.DisableVertexAttribArray(shader.maTexCoordHandle);
GLHelper.GetError();
}
// TODO: find better way to access shaders
public static void Reset()
{
singleton = null;
}
