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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
#include "pch.h"
#include "SamplerGLImpl.hpp"
#include "RenderDeviceGLImpl.hpp"
#include "GLTypeConversions.hpp"
namespace Diligent
{
SamplerGLImpl::SamplerGLImpl(IReferenceCounters* pRefCounters, class RenderDeviceGLImpl* pDeviceGL, const SamplerDesc& SamplerDesc, bool bIsDeviceInternal) :
// clang-format off
TSamplerBase
{
pRefCounters,
pDeviceGL,
SamplerDesc,
bIsDeviceInternal
},
m_GlSampler{true}
// clang-format on
{
const auto& SamCaps = pDeviceGL->GetDeviceCaps().SamCaps;
Bool bMinAnisotropic = False, bMagAnisotropic = False, bMipAnisotropic = False;
Bool bMinComparison = False, bMagComparison = False, bMipComparison = False;
GLenum GLMinFilter, GLMagFilter, GLMipFilter;
FilterTypeToGLFilterType(SamplerDesc.MinFilter, GLMinFilter, bMinAnisotropic, bMinComparison);
FilterTypeToGLFilterType(SamplerDesc.MagFilter, GLMagFilter, bMagAnisotropic, bMagComparison);
FilterTypeToGLFilterType(SamplerDesc.MipFilter, GLMipFilter, bMipAnisotropic, bMipComparison);
VERIFY(bMinAnisotropic == bMagAnisotropic && bMagAnisotropic == bMipAnisotropic, "Incosistent anisotropy filter setting");
VERIFY(bMinComparison == bMagComparison && bMagComparison == bMipComparison, "Incosistent comparison filter setting");
glSamplerParameteri(m_GlSampler, GL_TEXTURE_MAG_FILTER, GLMagFilter);
GLenum GlMinMipFilter = 0;
if (GLMinFilter == GL_NEAREST && GLMipFilter == GL_NEAREST)
GlMinMipFilter = GL_NEAREST_MIPMAP_NEAREST;
else if (GLMinFilter == GL_LINEAR && GLMipFilter == GL_NEAREST)
GlMinMipFilter = GL_LINEAR_MIPMAP_NEAREST;
else if (GLMinFilter == GL_NEAREST && GLMipFilter == GL_LINEAR)
GlMinMipFilter = GL_NEAREST_MIPMAP_LINEAR;
else if (GLMinFilter == GL_LINEAR && GLMipFilter == GL_LINEAR)
GlMinMipFilter = GL_LINEAR_MIPMAP_LINEAR;
else
LOG_ERROR_AND_THROW("Unsupported min/mip filter combination");
glSamplerParameteri(m_GlSampler, GL_TEXTURE_MIN_FILTER, GlMinMipFilter);
GLenum WrapModes[3] = {0};
TEXTURE_ADDRESS_MODE AddressModes[] =
{
SamplerDesc.AddressU,
SamplerDesc.AddressV,
SamplerDesc.AddressW //
};
for (int i = 0; i < _countof(AddressModes); ++i)
{
auto& WrapMode = WrapModes[i];
WrapMode = TexAddressModeToGLAddressMode(AddressModes[i]);
if (!SamCaps.BorderSamplingModeSupported && WrapMode == GL_CLAMP_TO_BORDER)
{
LOG_ERROR_MESSAGE("GL_CLAMP_TO_BORDER filtering mode is not supported. Defaulting to GL_CLAMP_TO_EDGE.\n");
WrapMode = GL_CLAMP_TO_EDGE;
}
}
glSamplerParameteri(m_GlSampler, GL_TEXTURE_WRAP_S, WrapModes[0]);
glSamplerParameteri(m_GlSampler, GL_TEXTURE_WRAP_T, WrapModes[1]);
glSamplerParameteri(m_GlSampler, GL_TEXTURE_WRAP_R, WrapModes[2]);
if (SamCaps.LODBiasSupported) // Can be unsupported
glSamplerParameterf(m_GlSampler, GL_TEXTURE_LOD_BIAS, SamplerDesc.MipLODBias);
else
{
if (SamplerDesc.MipLODBias)
LOG_WARNING_MESSAGE("Texture LOD bias sampler attribute is not supported\n");
}
if (SamCaps.AnisotropicFilteringSupported) // Can be unsupported
glSamplerParameterf(m_GlSampler, GL_TEXTURE_MAX_ANISOTROPY_EXT, bMipAnisotropic ? static_cast<float>(SamplerDesc.MaxAnisotropy) : 1.f);
else
{
if (bMipAnisotropic && SamplerDesc.MaxAnisotropy != 1)
LOG_WARNING_MESSAGE("Max anisotropy sampler attribute is not supported\n");
}
glSamplerParameteri(m_GlSampler, GL_TEXTURE_COMPARE_MODE, bMinComparison ? GL_COMPARE_REF_TO_TEXTURE : GL_NONE);
if (SamCaps.BorderSamplingModeSupported) // Can be unsupported
glSamplerParameterfv(m_GlSampler, GL_TEXTURE_BORDER_COLOR, SamplerDesc.BorderColor);
else
{
if (SamplerDesc.BorderColor[0] != 0 || SamplerDesc.BorderColor[1] != 0 || SamplerDesc.BorderColor[2] != 0 || SamplerDesc.BorderColor[3] != 0)
LOG_WARNING_MESSAGE("Border color sampler attribute is not supported\n");
}
GLenum GLCompareFunc = CompareFuncToGLCompareFunc(SamplerDesc.ComparisonFunc);
glSamplerParameteri(m_GlSampler, GL_TEXTURE_COMPARE_FUNC, GLCompareFunc);
glSamplerParameterf(m_GlSampler, GL_TEXTURE_MAX_LOD, SamplerDesc.MaxLOD);
glSamplerParameterf(m_GlSampler, GL_TEXTURE_MIN_LOD, SamplerDesc.MinLOD);
CHECK_GL_ERROR_AND_THROW("Failed to create OpenGL texture sampler\n");
}
SamplerGLImpl::~SamplerGLImpl()
{
}
IMPLEMENT_QUERY_INTERFACE(SamplerGLImpl, IID_SamplerGL, TSamplerBase)
} // namespace Diligent
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