public void TestDefaultPrecision(ShaderPrecisionContext ctx)
{
if (!HasVersion(2, 0) && !IsGlExtensionSupported("GL_ARB_vertex_shader"))
{
Assert.Inconclusive("OpenGL 2.0 or GL_ARB_vertex_shader not supported");
}
if (!HasVersion(3, 0) && !IsGlExtensionSupported("GL_EXT_transform_feedback"))
{
Assert.Inconclusive("OpenGL 3.0 or GL_EXT_transform_feedback not supported");
}
// Create resources required for test
ctx.CreateResources();
// Set program input
BindShaderProgramAttrib(ctx.Program, ctx.ProgramInput, "vertexIn");
// Set program output
Gl.BindBuffer(BufferTargetARB.TransformFeedbackBuffer, ctx.ProgramOutput);
// Draw on feedback buffer using program
Gl.UseProgram(ctx.Program);
// Transform feedback
Gl.BeginTransformFeedback(Gl.POINTS);
Gl.DrawArrays(PrimitiveType.Points, 0, ctx.ReferenceOutput.Length);
Gl.EndTransformFeedback();
// Get program computation result
float[] feedbackData = new float[ctx.ReferenceOutput.Length];
Gl.GetBufferSubData(BufferTargetARB.TransformFeedbackBuffer, IntPtr.Zero, (uint)feedbackData.Length, feedbackData);
// Check precision
}
/// <summary>
/// Binds the array buffer attached to.
/// </summary>
/// <param name='index'>
/// Index.
/// </param>
/// <exception cref='InvalidOperationException'>
/// Is thrown when an operation cannot be performed.
/// </exception>
public void Begin(GraphicsContext ctx, PrimitiveType primitive)
{
CheckThisExistence(ctx);
// Make this feedback buffer current
ctx.Bind(this);
// Begin transform feedback
switch (primitive)
{
case PrimitiveType.Points:
Gl.BeginTransformFeedback((int)PrimitiveType.Points);
break;
case PrimitiveType.Lines:
case PrimitiveType.LineStrip:
case PrimitiveType.LineLoop:
Gl.BeginTransformFeedback((int)PrimitiveType.Lines);
break;
case PrimitiveType.Triangles:
case PrimitiveType.TriangleStrip:
case PrimitiveType.TriangleFan:
Gl.BeginTransformFeedback((int)PrimitiveType.Triangles);
break;
default:
throw new InvalidOperationException();
}
// Disable rasterizer?
if (EnableRasterizer == false)
{
Gl.Enable(EnableCap.RasterizerDiscard);
}
// Start queries
_PrimitivesGenerated.Begin(ctx);
_PrimitivesWritten.Begin(ctx);
}
