/// <summary>
/// Checks if graphics shader code from all stages in memory is different from the cached shaders.
/// </summary>
/// <param name="gpShaders">Cached graphics shaders</param>
/// <param name="addresses">GPU virtual addresses of all enabled shader stages</param>
/// <returns>True if the code is different, false otherwise</returns>
private bool IsShaderDifferent(GraphicsShader gpShaders, ShaderAddresses addresses)
{
for (int stage = 0; stage < gpShaders.Shaders.Length; stage++)
{
CachedShader shader = gpShaders.Shaders[stage];
ulong gpuVa = 0;
switch (stage)
{
case 0: gpuVa = addresses.Vertex; break;
case 1: gpuVa = addresses.TessControl; break;
case 2: gpuVa = addresses.TessEvaluation; break;
case 3: gpuVa = addresses.Geometry; break;
case 4: gpuVa = addresses.Fragment; break;
}
if (IsShaderDifferent(shader, gpuVa))
{
return(true);
}
}
return(false);
}
/// <summary>
/// Gets a graphics shader program from the shader cache.
/// This includes all the specified shader stages.
/// </summary>
/// <remarks>
/// This automatically translates, compiles and adds the code to the cache if not present.
/// </remarks>
/// <param name="state">Current GPU state</param>
/// <param name="addresses">Addresses of the shaders for each stage</param>
/// <returns>Compiled graphics shader code</returns>
public GraphicsShader GetGraphicsShader(GpuState state, ShaderAddresses addresses)
{
bool isCached = _gpPrograms.TryGetValue(addresses, out List <GraphicsShader> list);
if (isCached)
{
foreach (GraphicsShader cachedGpShaders in list)
{
if (!IsShaderDifferent(cachedGpShaders, addresses))
{
return(cachedGpShaders);
}
}
}
GraphicsShader gpShaders = new GraphicsShader();
if (addresses.VertexA != 0)
{
gpShaders.Shaders[0] = TranslateGraphicsShader(state, ShaderStage.Vertex, addresses.Vertex, addresses.VertexA);
}
else
{
gpShaders.Shaders[0] = TranslateGraphicsShader(state, ShaderStage.Vertex, addresses.Vertex);
}
gpShaders.Shaders[1] = TranslateGraphicsShader(state, ShaderStage.TessellationControl, addresses.TessControl);
gpShaders.Shaders[2] = TranslateGraphicsShader(state, ShaderStage.TessellationEvaluation, addresses.TessEvaluation);
gpShaders.Shaders[3] = TranslateGraphicsShader(state, ShaderStage.Geometry, addresses.Geometry);
gpShaders.Shaders[4] = TranslateGraphicsShader(state, ShaderStage.Fragment, addresses.Fragment);
BackpropQualifiers(gpShaders);
List <IShader> hostShaders = new List <IShader>();
for (int stage = 0; stage < gpShaders.Shaders.Length; stage++)
{
ShaderProgram program = gpShaders.Shaders[stage]?.Program;
if (program == null)
{
continue;
}
IShader hostShader = _context.Renderer.CompileShader(program);
gpShaders.Shaders[stage].HostShader = hostShader;
hostShaders.Add(hostShader);
}
gpShaders.HostProgram = _context.Renderer.CreateProgram(hostShaders.ToArray());
if (!isCached)
{
list = new List <GraphicsShader>();
_gpPrograms.Add(addresses, list);
}
list.Add(gpShaders);
return(gpShaders);
}
