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// Copyright 2017 The Dawn Authors
//
// 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.
#include "dawn_native/opengl/SamplerGL.h"
#include "common/Assert.h"
#include "dawn_native/opengl/DeviceGL.h"
#include "dawn_native/opengl/UtilsGL.h"
namespace dawn_native { namespace opengl {
namespace {
GLenum MagFilterMode(wgpu::FilterMode filter) {
switch (filter) {
case wgpu::FilterMode::Nearest:
return GL_NEAREST;
case wgpu::FilterMode::Linear:
return GL_LINEAR;
}
}
GLenum MinFilterMode(wgpu::FilterMode minFilter, wgpu::FilterMode mipMapFilter) {
switch (minFilter) {
case wgpu::FilterMode::Nearest:
switch (mipMapFilter) {
case wgpu::FilterMode::Nearest:
return GL_NEAREST_MIPMAP_NEAREST;
case wgpu::FilterMode::Linear:
return GL_NEAREST_MIPMAP_LINEAR;
}
case wgpu::FilterMode::Linear:
switch (mipMapFilter) {
case wgpu::FilterMode::Nearest:
return GL_LINEAR_MIPMAP_NEAREST;
case wgpu::FilterMode::Linear:
return GL_LINEAR_MIPMAP_LINEAR;
}
}
}
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;
}
}
} // namespace
Sampler::Sampler(Device* device, const SamplerDescriptor* descriptor)
: SamplerBase(device, descriptor) {
const OpenGLFunctions& gl = ToBackend(GetDevice())->gl;
gl.GenSamplers(1, &mFilteringHandle);
SetupGLSampler(mFilteringHandle, descriptor, false);
gl.GenSamplers(1, &mNonFilteringHandle);
SetupGLSampler(mNonFilteringHandle, descriptor, true);
}
Sampler::~Sampler() {
const OpenGLFunctions& gl = ToBackend(GetDevice())->gl;
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->gl;
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 (gl.IsAtLeastGL(4, 6) ||
gl.IsGLExtensionSupported("GL_EXT_texture_filter_anisotropic")) {
gl.SamplerParameterf(sampler, GL_TEXTURE_MAX_ANISOTROPY, GetMaxAnisotropy());
}
}
GLuint Sampler::GetFilteringHandle() const {
return mFilteringHandle;
}
GLuint Sampler::GetNonFilteringHandle() const {
return mNonFilteringHandle;
}
}} // namespace dawn_native::opengl