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//
// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// WorkaroundsD3D.h: Workarounds for D3D driver bugs and other issues.
#ifndef LIBANGLE_RENDERER_D3D_WORKAROUNDSD3D_H_
#define LIBANGLE_RENDERER_D3D_WORKAROUNDSD3D_H_
// TODO(jmadill,zmo,geofflang): make a workarounds library that can operate
// independent of ANGLE's renderer. Workarounds should also be accessible
// outside of the Renderer.
namespace rx
{
struct D3DCompilerWorkarounds
{
D3DCompilerWorkarounds()
: skipOptimization(false), useMaxOptimization(false), enableIEEEStrictness(false)
{
}
bool skipOptimization;
bool useMaxOptimization;
// IEEE strictness needs to be enabled for NANs to work.
bool enableIEEEStrictness;
};
struct WorkaroundsD3D
{
WorkaroundsD3D()
: mrtPerfWorkaround(false),
setDataFasterThanImageUpload(false),
zeroMaxLodWorkaround(false),
useInstancedPointSpriteEmulation(false)
{
}
// On some systems, having extra rendertargets than necessary slows down the shader.
// We can fix this by optimizing those out of the shader. At the same time, we can
// work around a bug on some nVidia drivers that they ignore "null" render targets
// in D3D11, by compacting the active color attachments list to omit null entries.
bool mrtPerfWorkaround;
bool setDataFasterThanImageUpload;
// Some renderers can't disable mipmaps on a mipmapped texture (i.e. solely sample from level
// zero, and ignore the other levels). D3D11 Feature Level 10+ does this by setting MaxLOD to
// 0.0f in the Sampler state. D3D9 sets D3DSAMP_MIPFILTER to D3DTEXF_NONE. There is no
// equivalent to this in D3D11 Feature Level 9_3. This causes problems when (for example) an
// application creates a mipmapped texture2D, but sets GL_TEXTURE_MIN_FILTER to GL_NEAREST
// (i.e disables mipmaps). To work around this, D3D11 FL9_3 has to create two copies of the
// texture. The textures' level zeros are identical, but only one texture has mips.
bool zeroMaxLodWorkaround;
// Some renderers do not support Geometry Shaders so the Geometry Shader-based PointSprite
// emulation will not work. To work around this, D3D11 FL9_3 has to use a different pointsprite
// emulation that is implemented using instanced quads.
bool useInstancedPointSpriteEmulation;
};
}
#endif // LIBANGLE_RENDERER_D3D_WORKAROUNDSD3D_H_
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