mirror of
https://github.com/encounter/dawn-cmake.git
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96 lines
2.6 KiB
C++
96 lines
2.6 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/TextureGL.h"
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#include "common/Assert.h"
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#include <algorithm>
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#include <vector>
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namespace backend {
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namespace opengl {
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namespace {
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GLenum TargetForDimension(nxt::TextureDimension dimension) {
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switch (dimension) {
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case nxt::TextureDimension::e2D:
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return GL_TEXTURE_2D;
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default:
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UNREACHABLE();
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}
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}
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TextureFormatInfo GetGLFormatInfo(nxt::TextureFormat format) {
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switch (format) {
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case nxt::TextureFormat::R8G8B8A8Unorm:
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return {GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE};
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default:
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UNREACHABLE();
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}
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}
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}
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// Texture
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Texture::Texture(TextureBuilder* builder)
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: TextureBase(builder) {
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target = TargetForDimension(GetDimension());
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uint32_t width = GetWidth();
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uint32_t height = GetHeight();
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uint32_t levels = GetNumMipLevels();
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auto formatInfo = GetGLFormatInfo(GetFormat());
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glGenTextures(1, &handle);
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glBindTexture(target, handle);
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for (uint32_t i = 0; i < levels; ++i) {
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glTexImage2D(target, i, formatInfo.internalFormat, width, height, 0, formatInfo.format, formatInfo.type, nullptr);
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width = std::max(uint32_t(1), width / 2);
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height = std::max(uint32_t(1), height / 2);
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}
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// The texture is not complete if it uses mipmapping and not all levels up to
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// MAX_LEVEL have been defined.
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glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels - 1);
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}
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GLuint Texture::GetHandle() const {
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return handle;
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}
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GLenum Texture::GetGLTarget() const {
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return target;
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}
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TextureFormatInfo Texture::GetGLFormat() const {
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return GetGLFormatInfo(GetFormat());
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}
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void Texture::TransitionUsageImpl(nxt::TextureUsageBit, nxt::TextureUsageBit) {
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}
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// TextureView
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TextureView::TextureView(TextureViewBuilder* builder)
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: TextureViewBase(builder) {
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}
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}
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}
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