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// Copyright 2017 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "dawn/native/opengl/SamplerGL.h"
#include <algorithm>
#include <cstdint>
#include "dawn/common/Assert.h"
#include "dawn/native/opengl/DeviceGL.h"
#include "dawn/native/opengl/UtilsGL.h"
namespace dawn::native::opengl {
namespace {
GLenum MagFilterMode(wgpu::FilterMode filter) {
switch (filter) {
case wgpu::FilterMode::Nearest:
return GL_NEAREST;
case wgpu::FilterMode::Linear:
return GL_LINEAR;
case wgpu::FilterMode::Undefined:
break;
}
DAWN_UNREACHABLE();
}
GLenum MinFilterMode(wgpu::FilterMode minFilter, wgpu::MipmapFilterMode mipMapFilter) {
switch (minFilter) {
case wgpu::FilterMode::Nearest:
switch (mipMapFilter) {
case wgpu::MipmapFilterMode::Nearest:
return GL_NEAREST_MIPMAP_NEAREST;
case wgpu::MipmapFilterMode::Linear:
return GL_NEAREST_MIPMAP_LINEAR;
case wgpu::MipmapFilterMode::Undefined:
DAWN_UNREACHABLE();
}
case wgpu::FilterMode::Linear:
switch (mipMapFilter) {
case wgpu::MipmapFilterMode::Nearest:
return GL_LINEAR_MIPMAP_NEAREST;
case wgpu::MipmapFilterMode::Linear:
return GL_LINEAR_MIPMAP_LINEAR;
case wgpu::MipmapFilterMode::Undefined:
DAWN_UNREACHABLE();
}
case wgpu::FilterMode::Undefined:
DAWN_UNREACHABLE();
}
DAWN_UNREACHABLE();
}
GLenum WrapMode(wgpu::AddressMode mode) {
switch (mode) {
case wgpu::AddressMode::Repeat:
return GL_REPEAT;
case wgpu::AddressMode::MirrorRepeat:
return GL_MIRRORED_REPEAT;
case wgpu::AddressMode::ClampToEdge:
return GL_CLAMP_TO_EDGE;
case wgpu::AddressMode::Undefined:
break;
}
DAWN_UNREACHABLE();
}
} // namespace
Sampler::Sampler(Device* device, const SamplerDescriptor* descriptor)
: SamplerBase(device, descriptor) {
const OpenGLFunctions& gl = ToBackend(GetDevice())->GetGL();
gl.GenSamplers(1, &mFilteringHandle);
SetupGLSampler(mFilteringHandle, descriptor, false);
gl.GenSamplers(1, &mNonFilteringHandle);
SetupGLSampler(mNonFilteringHandle, descriptor, true);
}
Sampler::~Sampler() = default;
void Sampler::DestroyImpl() {
SamplerBase::DestroyImpl();
const OpenGLFunctions& gl = ToBackend(GetDevice())->GetGL();
gl.DeleteSamplers(1, &mFilteringHandle);
gl.DeleteSamplers(1, &mNonFilteringHandle);
}
void Sampler::SetupGLSampler(GLuint sampler,
const SamplerDescriptor* descriptor,
bool forceNearest) {
Device* device = ToBackend(GetDevice());
const OpenGLFunctions& gl = device->GetGL();
if (forceNearest) {
gl.SamplerParameteri(sampler, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
gl.SamplerParameteri(sampler, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
} else {
gl.SamplerParameteri(sampler, GL_TEXTURE_MAG_FILTER, MagFilterMode(descriptor->magFilter));
gl.SamplerParameteri(sampler, GL_TEXTURE_MIN_FILTER,
MinFilterMode(descriptor->minFilter, descriptor->mipmapFilter));
}
gl.SamplerParameteri(sampler, GL_TEXTURE_WRAP_R, WrapMode(descriptor->addressModeW));
gl.SamplerParameteri(sampler, GL_TEXTURE_WRAP_S, WrapMode(descriptor->addressModeU));
gl.SamplerParameteri(sampler, GL_TEXTURE_WRAP_T, WrapMode(descriptor->addressModeV));
gl.SamplerParameterf(sampler, GL_TEXTURE_MIN_LOD, descriptor->lodMinClamp);
gl.SamplerParameterf(sampler, GL_TEXTURE_MAX_LOD, descriptor->lodMaxClamp);
if (descriptor->compare != wgpu::CompareFunction::Undefined) {
gl.SamplerParameteri(sampler, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
gl.SamplerParameteri(sampler, GL_TEXTURE_COMPARE_FUNC,
ToOpenGLCompareFunction(descriptor->compare));
}
if (HasAnisotropicFiltering(gl)) {
uint16_t value =
std::min<uint16_t>(GetMaxAnisotropy(), device->GetMaxTextureMaxAnisotropy());
gl.SamplerParameteri(sampler, GL_TEXTURE_MAX_ANISOTROPY, value);
}
}
GLuint Sampler::GetFilteringHandle() const {
return mFilteringHandle;
}
GLuint Sampler::GetNonFilteringHandle() const {
return mNonFilteringHandle;
}
} // namespace dawn::native::opengl