blob: ebf47578afc18faa95d2578c388f82bbf4348024 [file] [log] [blame]
// 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"
namespace dawn_native { namespace opengl {
namespace {
GLenum MagFilterMode(dawn::FilterMode filter) {
switch (filter) {
case dawn::FilterMode::Nearest:
return GL_NEAREST;
case dawn::FilterMode::Linear:
return GL_LINEAR;
default:
UNREACHABLE();
}
}
GLenum MinFilterMode(dawn::FilterMode minFilter, dawn::FilterMode mipMapFilter) {
switch (minFilter) {
case dawn::FilterMode::Nearest:
switch (mipMapFilter) {
case dawn::FilterMode::Nearest:
return GL_NEAREST_MIPMAP_NEAREST;
case dawn::FilterMode::Linear:
return GL_NEAREST_MIPMAP_LINEAR;
default:
UNREACHABLE();
}
case dawn::FilterMode::Linear:
switch (mipMapFilter) {
case dawn::FilterMode::Nearest:
return GL_LINEAR_MIPMAP_NEAREST;
case dawn::FilterMode::Linear:
return GL_LINEAR_MIPMAP_LINEAR;
default:
UNREACHABLE();
}
default:
UNREACHABLE();
}
}
GLenum WrapMode(dawn::AddressMode mode) {
switch (mode) {
case dawn::AddressMode::Repeat:
return GL_REPEAT;
case dawn::AddressMode::MirroredRepeat:
return GL_MIRRORED_REPEAT;
case dawn::AddressMode::ClampToEdge:
return GL_CLAMP_TO_EDGE;
default:
UNREACHABLE();
}
}
} // namespace
Sampler::Sampler(Device* device, const SamplerDescriptor* descriptor)
: SamplerBase(device, descriptor) {
glGenSamplers(1, &mHandle);
glSamplerParameteri(mHandle, GL_TEXTURE_MAG_FILTER, MagFilterMode(descriptor->magFilter));
glSamplerParameteri(mHandle, GL_TEXTURE_MIN_FILTER,
MinFilterMode(descriptor->minFilter, descriptor->mipmapFilter));
glSamplerParameteri(mHandle, GL_TEXTURE_WRAP_R, WrapMode(descriptor->addressModeW));
glSamplerParameteri(mHandle, GL_TEXTURE_WRAP_S, WrapMode(descriptor->addressModeU));
glSamplerParameteri(mHandle, GL_TEXTURE_WRAP_T, WrapMode(descriptor->addressModeV));
}
GLuint Sampler::GetHandle() const {
return mHandle;
}
}} // namespace dawn_native::opengl