public override void initShaderProgram(IRenderingEngine re, int shaderProgram)
{
int blockIndex = re.getUniformBlockIndex(shaderProgram, uniformBlockName);
// The uniform block might have been eliminated by the shader compiler
// if it was not used at all.
if (blockIndex >= 0)
{
re.setUniformBlockBinding(shaderProgram, blockIndex, bindingPoint);
}
if (data == null)
{
int previousOffset = -1;
foreach (ShaderUniformInfo shaderUniformInfo in shaderUniformInfos)
{
int index = re.getUniformIndex(shaderProgram, shaderUniformInfo.Name);
int offset = re.getActiveUniformOffset(shaderProgram, index);
// Nvidia workaRound: the offset of the first uniform is returned as 1 instead of 0.
if (offset == 1)
{
offset = 0;
}
shaderUniformInfo.Offset = offset;
// An unused uniform has the same offset as its previous uniform.
// An unused uniform should not be copied into the UBO buffer,
// otherwise it would overwrite the previous uniform value.
if (offset < 0 || offset == previousOffset)
{
shaderUniformInfo.setUnused();
}
//if (log.DebugEnabled)
{
Console.WriteLine(string.Format("Uniform {0}", shaderUniformInfo));
}
previousOffset = offset;
}
// The size returned by
// glGetActiveUniformBlock(program, blockIndex, ARBUniformBufferObject.GL_UNIFORM_BLOCK_DATA_SIZE)
// is not reliable as the driver is free to reduce array sizes when they
// are not used in the shader.
// Use a dummy element of the structure to find the total structure size.
int lastOffset;
if (endOfUBO.Offset <= 0 || !endOfUBO.Used)
{
// If the endOfUBO uniform has been eliminated by the shader compiler,
// estimate the end of the buffer by using the offset of the boneMatrix uniform.
lastOffset = boneMatrix.Offset + boneMatrix.MatrixSize * 4 * 4 * SIZEOF_FLOAT;
}
else
{
lastOffset = endOfUBO.Offset;
}
bufferSize = lastOffset + 4;
//if (log.DebugEnabled)
{
Console.WriteLine(string.Format("UBO Structure size: {0:D} (including endOfUBO)", bufferSize));
}
buffer = re.genBuffer();
re.bindBuffer(IRenderingEngine_Fields.RE_UNIFORM_BUFFER, buffer);
data = ByteBuffer.allocateDirect(bufferSize).order(ByteOrder.nativeOrder());
// Initialize the buffer to 0's
for (int i = 0; i < bufferSize; i++)
{
data.put(i, (sbyte)0);
}
re.setBufferData(IRenderingEngine_Fields.RE_UNIFORM_BUFFER, bufferSize, data, IRenderingEngine_Fields.RE_DYNAMIC_DRAW);
// On AMD hardware, the buffer data has to be set (setBufferData) before calling bindBufferBase
re.bindBufferBase(IRenderingEngine_Fields.RE_UNIFORM_BUFFER, bindingPoint, buffer);
startUpdate = 0;
endUpdate = bufferSize;
}
base.initShaderProgram(re, shaderProgram);
}
public virtual void bindBufferBase(int target, int bindingPoint, int buffer)
{
proxy.bindBufferBase(target, bindingPoint, buffer);
}