public void SetUniform(string name, float v1, float?v2 = null, float?v3 = null, float?v4 = null)
{
if (ActiveShaderProgram == null)
{
throw new InvalidOperationException("No shader program is loaded. Cannot set uniforms.");
}
int uniformLocation = Gl.GetUniformLocation(ActiveShaderProgram.ProgramId, name);
if (uniformLocation < 0)
{
throw new KeyNotFoundException(string.Format("The specified uniform '{0}' cannot be found for program '{1}'.", name, ActiveShaderProgram.ProgramId));
}
if (v4 != null && v4.HasValue)
{
Gl.Uniform4(uniformLocation, v1, v2.Value, v3.Value, v4.Value);
return;
}
if (v3 != null && v3.HasValue)
{
Gl.Uniform3(uniformLocation, v1, v2.Value, v3.Value);
return;
}
if (v2 != null && v2.HasValue)
{
Gl.Uniform2(uniformLocation, v1, v2.Value);
return;
}
Gl.Uniform1(uniformLocation, v1);
return;
}
protected override void Renderer_DrawPrepare(RenderThread sender, FrameStageControllerEventArgs args)
{
CheckGlErrors("pre-program");
sender.SelectShader(glyphShader);
CheckGlErrors("post-program");
sender.SelectShader(glyphShader);
sender.SetUniform("resolution", 0, 0, sender.InternalResolution.Width, sender.InternalResolution.Height);
sender.SetUniform("atlasSize", fontAtlas.AtlasTextureSize.Width, fontAtlas.AtlasTextureSize.Height);
Gl.Uniform1(Gl.GetUniformLocation(glyphShader.ProgramId, "atlasTexture"), 0);
CheckGlErrors("post-uniforms");
}
