private void BindUniformBlock(OpenGLShaderSet shaderSet, int slot, int blockLocation, OpenGLConstantBuffer cb)
{
if (slot > _maxConstantBufferSlots)
{
throw new VeldridException($"Too many constant buffers used. Limit is {_maxConstantBufferSlots}.");
}
// Bind Constant Buffer to slot
if (_constantBuffersBySlot[slot] == cb)
{
if (_newConstantBuffersBySlot[slot] != null)
{
_newConstantBuffersCount -= 1;
}
_newConstantBuffersBySlot[slot] = null;
}
else
{
if (_newConstantBuffersBySlot[slot] == null)
{
_newConstantBuffersCount += 1;
}
_newConstantBuffersBySlot[slot] = cb;
}
// Bind slot to uniform block location. Performs internal caching to avoid GL calls.
shaderSet.BindConstantBuffer(slot, blockLocation, cb);
}
protected override void PlatformSetShaderSet(ShaderSet shaderSet)
{
OpenGLShaderSet glShaderSet = (OpenGLShaderSet)shaderSet;
GL.UseProgram(glShaderSet.ProgramID);
_vertexLayoutChanged = true;
}
public OpenGLShaderResourceBindingSlots(OpenGLShaderSet shaderSet, ShaderResourceDescription[] resources)
{
Resources = resources;
int programID = shaderSet.ProgramID;
int lastTextureLocation = -1;
int relativeTextureIndex = -1;
for (int i = 0; i < resources.Length; i++)
{
ShaderResourceDescription resource = resources[i];
if (resource.Type == ShaderResourceType.ConstantBuffer)
{
int blockIndex = GL.GetUniformBlockIndex(programID, resource.Name);
if (blockIndex != -1)
{
ValidateBlockSize(programID, blockIndex, resource.DataSizeInBytes, resource.Name);
_constantBindings[i] = new OpenGLUniformBinding(programID, blockIndex, resource.DataSizeInBytes);
}
else
{
int uniformLocation = GL.GetUniformLocation(programID, resource.Name);
OpenGLUniformStorageAdapter storageAdapter = new OpenGLUniformStorageAdapter(programID, uniformLocation);
_constantBindings[i] = new OpenGLUniformBinding(programID, storageAdapter);
}
}
else if (resource.Type == ShaderResourceType.Texture)
{
int location = GL.GetUniformLocation(shaderSet.ProgramID, resource.Name);
relativeTextureIndex += 1;
_textureBindings[i] = new OpenGLTextureBindingSlotInfo()
{
RelativeIndex = relativeTextureIndex, UniformLocation = location
};
lastTextureLocation = location;
}
else
{
Debug.Assert(resource.Type == ShaderResourceType.Sampler);
// TODO: Samplers should be able to bind to multiple texture slots
// if multiple textures are declared without an intervening sampler. For example:
// Slot Resource
// -------------------------
// [0] Texture0
// [1] Sampler0
// [2] Texture1
// [3] Texture2
// [4] Sampler1*
// Sampler1 should be active for both Texture1 and Texture2.
_samplerBindings[i] = new OpenGLTextureBindingSlotInfo()
{
RelativeIndex = relativeTextureIndex, UniformLocation = lastTextureLocation
};
}
}
}
public OpenGLShaderResourceBindingSlots(OpenGLShaderSet shaderSet, ShaderResourceDescription[] resources)
{
Resources = resources;
int programID = shaderSet.ProgramID;
int lastTextureLocation = -1;
int relativeTextureIndex = -1;
for (int i = 0; i < resources.Length; i++)
{
ShaderResourceDescription resource = resources[i];
if (resource.Type == ShaderResourceType.ConstantBuffer)
{
int blockIndex = GL.GetUniformBlockIndex(programID, resource.Name);
if (blockIndex != -1)
{
ValidateBlockSize(programID, blockIndex, resource.DataSizeInBytes, resource.Name);
_constantBindings[i] = new OpenGLUniformBinding(programID, blockIndex, resource.DataSizeInBytes);
}
else
{
int uniformLocation = GL.GetUniformLocation(programID, resource.Name);
if (uniformLocation == -1)
{
throw new VeldridException($"No uniform or uniform block with name {resource.Name} was found.");
}
OpenGLUniformStorageAdapter storageAdapter = new OpenGLUniformStorageAdapter(programID, uniformLocation);
_constantBindings[i] = new OpenGLUniformBinding(programID, storageAdapter);
}
}
else if (resource.Type == ShaderResourceType.Texture)
{
int location = GL.GetUniformLocation(shaderSet.ProgramID, resource.Name);
if (location == -1)
{
throw new VeldridException($"No sampler was found with the name {resource.Name}");
}
relativeTextureIndex += 1;
_textureBindings[i] = new OpenGLTextureBindingSlotInfo()
{
RelativeIndex = relativeTextureIndex, UniformLocation = location
};
lastTextureLocation = location;
}
else
{
Debug.Assert(resource.Type == ShaderResourceType.Sampler);
if (lastTextureLocation == -1)
{
throw new VeldridException(
"OpenGL Shaders must specify at least one texture before a sampler. Samplers are implicity linked with the closest-previous texture resource in the binding list.");
}
_samplerBindings[i] = new OpenGLTextureBindingSlotInfo()
{
RelativeIndex = relativeTextureIndex, UniformLocation = lastTextureLocation
};
}
}
}
