Move src/backend to src/dawn_native

src/dawn_native/opengl/TextureGL.cpp

@@ -0,0 +1,119 @@
+// 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/TextureGL.h"
+
+#include "common/Assert.h"
+
+#include <algorithm>
+#include <vector>
+
+namespace backend { namespace opengl {
+
+    namespace {
+
+        GLenum TargetForDimension(dawn::TextureDimension dimension) {
+            switch (dimension) {
+                case dawn::TextureDimension::e2D:
+                    return GL_TEXTURE_2D;
+                default:
+                    UNREACHABLE();
+            }
+        }
+
+        TextureFormatInfo GetGLFormatInfo(dawn::TextureFormat format) {
+            switch (format) {
+                case dawn::TextureFormat::R8G8B8A8Unorm:
+                    return {GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE};
+                case dawn::TextureFormat::R8G8Unorm:
+                    return {GL_RG8, GL_RG, GL_UNSIGNED_BYTE};
+                case dawn::TextureFormat::R8Unorm:
+                    return {GL_R8, GL_RED, GL_UNSIGNED_BYTE};
+                case dawn::TextureFormat::R8G8B8A8Uint:
+                    return {GL_RGBA8UI, GL_RGBA, GL_UNSIGNED_INT};
+                case dawn::TextureFormat::R8G8Uint:
+                    return {GL_RG8UI, GL_RG, GL_UNSIGNED_INT};
+                case dawn::TextureFormat::R8Uint:
+                    return {GL_R8UI, GL_RED, GL_UNSIGNED_INT};
+                case dawn::TextureFormat::B8G8R8A8Unorm:
+                    // This doesn't have an enum for the internal format in OpenGL, so use RGBA8.
+                    return {GL_RGBA8, GL_BGRA, GL_UNSIGNED_BYTE};
+                case dawn::TextureFormat::D32FloatS8Uint:
+                    return {GL_DEPTH32F_STENCIL8, GL_DEPTH_STENCIL,
+                            GL_FLOAT_32_UNSIGNED_INT_24_8_REV};
+                default:
+                    UNREACHABLE();
+            }
+        }
+
+        GLuint GenTexture() {
+            GLuint handle = 0;
+            glGenTextures(1, &handle);
+            return handle;
+        }
+
+    }  // namespace
+
+    // Texture
+
+    Texture::Texture(TextureBuilder* builder) : Texture(builder, GenTexture()) {
+    }
+
+    Texture::Texture(TextureBuilder* builder, GLuint handle)
+        : TextureBase(builder), mHandle(handle) {
+        mTarget = TargetForDimension(GetDimension());
+
+        uint32_t width = GetWidth();
+        uint32_t height = GetHeight();
+        uint32_t levels = GetNumMipLevels();
+
+        auto formatInfo = GetGLFormatInfo(GetFormat());
+
+        glBindTexture(mTarget, handle);
+
+        for (uint32_t i = 0; i < levels; ++i) {
+            glTexImage2D(mTarget, i, formatInfo.internalFormat, width, height, 0, formatInfo.format,
+                         formatInfo.type, nullptr);
+            width = std::max(uint32_t(1), width / 2);
+            height = std::max(uint32_t(1), height / 2);
+        }
+
+        // The texture is not complete if it uses mipmapping and not all levels up to
+        // MAX_LEVEL have been defined.
+        glTexParameteri(mTarget, GL_TEXTURE_MAX_LEVEL, levels - 1);
+    }
+
+    Texture::~Texture() {
+        // TODO(kainino@chromium.org): delete texture (but only when not using the native texture
+        // constructor?)
+    }
+
+    GLuint Texture::GetHandle() const {
+        return mHandle;
+    }
+
+    GLenum Texture::GetGLTarget() const {
+        return mTarget;
+    }
+
+    TextureFormatInfo Texture::GetGLFormat() const {
+        return GetGLFormatInfo(GetFormat());
+    }
+
+    // TextureView
+
+    TextureView::TextureView(TextureViewBuilder* builder) : TextureViewBase(builder) {
+    }
+
+}}  // namespace backend::opengl