private void SetupComputeShader(ref RenderTexture renderTexture)
{
cs = Object.Instantiate(AssetRepository.LoadCalculateSelectAreaComputeShader());
addPointKernelId = cs.FindKernel("CSAddPoint");
addLineKernelId = cs.FindKernel("CSAddLine");
fillKernelId = cs.FindKernel("CSFill");
clearKernelId = cs.FindKernel("CSClear");
inverseFillKernelId = cs.FindKernel("CSInverseFill");
cs.SetTexture(addPointKernelId, CS_VARIABLE_SELECT_AREA_TEX, renderTexture);
cs.SetTexture(addLineKernelId, CS_VARIABLE_SELECT_AREA_TEX, renderTexture);
cs.SetTexture(fillKernelId, CS_VARIABLE_SELECT_AREA_TEX, renderTexture);
cs.SetTexture(clearKernelId, CS_VARIABLE_SELECT_AREA_TEX, renderTexture);
cs.SetTexture(inverseFillKernelId, CS_VARIABLE_SELECT_AREA_TEX, renderTexture);
buffer = new ComputeBuffer(renderTexture.width * renderTexture.height, sizeof(int));
cs.SetBuffer(addPointKernelId, CS_VARIABLE_SELECT_RESULT, buffer);
cs.SetBuffer(addLineKernelId, CS_VARIABLE_SELECT_RESULT, buffer);
cs.SetBuffer(fillKernelId, CS_VARIABLE_SELECT_RESULT, buffer);
cs.SetBuffer(clearKernelId, CS_VARIABLE_SELECT_RESULT, buffer);
cs.SetBuffer(inverseFillKernelId, CS_VARIABLE_SELECT_RESULT, buffer);
cs.SetInt(CS_VARIABLE_WIDTH, renderTexture.width);
}