mirror of
https://github.com/encounter/dawn-cmake.git
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90 lines
3.3 KiB
C++
90 lines
3.3 KiB
C++
// Copyright 2017 The NXT Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "backend/opengl/SamplerGL.h"
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#include "backend/opengl/DeviceGL.h"
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#include "common/Assert.h"
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namespace backend { namespace opengl {
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namespace {
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GLenum MagFilterMode(nxt::FilterMode filter) {
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switch (filter) {
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case nxt::FilterMode::Nearest:
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return GL_NEAREST;
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case nxt::FilterMode::Linear:
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return GL_LINEAR;
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default:
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UNREACHABLE();
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}
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}
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GLenum MinFilterMode(nxt::FilterMode minFilter, nxt::FilterMode mipMapFilter) {
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switch (minFilter) {
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case nxt::FilterMode::Nearest:
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switch (mipMapFilter) {
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case nxt::FilterMode::Nearest:
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return GL_NEAREST_MIPMAP_NEAREST;
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case nxt::FilterMode::Linear:
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return GL_NEAREST_MIPMAP_LINEAR;
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default:
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UNREACHABLE();
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}
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case nxt::FilterMode::Linear:
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switch (mipMapFilter) {
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case nxt::FilterMode::Nearest:
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return GL_LINEAR_MIPMAP_NEAREST;
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case nxt::FilterMode::Linear:
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return GL_LINEAR_MIPMAP_LINEAR;
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default:
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UNREACHABLE();
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}
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default:
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UNREACHABLE();
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}
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}
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GLenum WrapMode(nxt::AddressMode mode) {
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switch (mode) {
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case nxt::AddressMode::Repeat:
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return GL_REPEAT;
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case nxt::AddressMode::MirroredRepeat:
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return GL_MIRRORED_REPEAT;
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case nxt::AddressMode::ClampToEdge:
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return GL_CLAMP_TO_EDGE;
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default:
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UNREACHABLE();
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}
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}
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} // namespace
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Sampler::Sampler(Device* device, const nxt::SamplerDescriptor* descriptor)
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: SamplerBase(device, descriptor) {
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glGenSamplers(1, &mHandle);
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glSamplerParameteri(mHandle, GL_TEXTURE_MAG_FILTER, MagFilterMode(descriptor->magFilter));
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glSamplerParameteri(mHandle, GL_TEXTURE_MIN_FILTER,
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MinFilterMode(descriptor->minFilter, descriptor->mipmapFilter));
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glSamplerParameteri(mHandle, GL_TEXTURE_WRAP_R, WrapMode(descriptor->addressModeW));
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glSamplerParameteri(mHandle, GL_TEXTURE_WRAP_S, WrapMode(descriptor->addressModeU));
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glSamplerParameteri(mHandle, GL_TEXTURE_WRAP_T, WrapMode(descriptor->addressModeV));
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}
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GLuint Sampler::GetHandle() const {
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return mHandle;
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}
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}} // namespace backend::opengl
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