143 lines
5.0 KiB
C++
143 lines
5.0 KiB
C++
// Copyright 2017 The Dawn 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 "utils/BackendBinding.h"
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#include "common/Assert.h"
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#include "common/Platform.h"
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#include "common/SwapChainUtils.h"
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#include "dawn/dawn_wsi.h"
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#include "dawn_native/OpenGLBackend.h"
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// Glad needs to be included before GLFW otherwise it complain that GL.h was already included
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#include "glad/glad.h"
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#include <cstdio>
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#include "GLFW/glfw3.h"
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namespace utils {
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class SwapChainImplGL {
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public:
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using WSIContext = dawnWSIContextGL;
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SwapChainImplGL(GLFWwindow* window) : mWindow(window) {
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}
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~SwapChainImplGL() {
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glDeleteTextures(1, &mBackTexture);
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glDeleteFramebuffers(1, &mBackFBO);
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}
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void Init(dawnWSIContextGL*) {
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glGenTextures(1, &mBackTexture);
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glBindTexture(GL_TEXTURE_2D, mBackTexture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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glGenFramebuffers(1, &mBackFBO);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, mBackFBO);
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glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
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mBackTexture, 0);
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}
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dawnSwapChainError Configure(dawnTextureFormat format,
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dawnTextureUsageBit,
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uint32_t width,
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uint32_t height) {
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if (format != DAWN_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM) {
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return "unsupported format";
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}
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ASSERT(width > 0);
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ASSERT(height > 0);
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mWidth = width;
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mHeight = height;
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glBindTexture(GL_TEXTURE_2D, mBackTexture);
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// Reallocate the texture
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
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nullptr);
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return DAWN_SWAP_CHAIN_NO_ERROR;
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}
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dawnSwapChainError GetNextTexture(dawnSwapChainNextTexture* nextTexture) {
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nextTexture->texture.u32 = mBackTexture;
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return DAWN_SWAP_CHAIN_NO_ERROR;
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}
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dawnSwapChainError Present() {
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glBindFramebuffer(GL_READ_FRAMEBUFFER, mBackFBO);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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glBlitFramebuffer(0, 0, mWidth, mHeight, 0, mHeight, mWidth, 0, GL_COLOR_BUFFER_BIT,
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GL_NEAREST);
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glfwSwapBuffers(mWindow);
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return DAWN_SWAP_CHAIN_NO_ERROR;
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}
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private:
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GLFWwindow* mWindow = nullptr;
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uint32_t mWidth = 0;
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uint32_t mHeight = 0;
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GLuint mBackFBO = 0;
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GLuint mBackTexture = 0;
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};
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class OpenGLBinding : public BackendBinding {
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public:
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void SetupGLFWWindowHints() override {
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#if defined(DAWN_PLATFORM_APPLE)
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
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glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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#else
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 4);
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glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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#endif
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}
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void GetProcAndDevice(dawnProcTable* procs, dawnDevice* device) override {
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glfwMakeContextCurrent(mWindow);
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// Load the GL entry points in our copy of the glad static library
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gladLoadGLLoader(reinterpret_cast<GLADloadproc>(glfwGetProcAddress));
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dawn_native::opengl::Init(reinterpret_cast<void* (*)(const char*)>(glfwGetProcAddress),
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procs, device);
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mBackendDevice = *device;
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}
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uint64_t GetSwapChainImplementation() override {
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if (mSwapchainImpl.userData == nullptr) {
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mSwapchainImpl = CreateSwapChainImplementation(new SwapChainImplGL(mWindow));
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}
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return reinterpret_cast<uint64_t>(&mSwapchainImpl);
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}
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dawnTextureFormat GetPreferredSwapChainTextureFormat() override {
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return DAWN_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
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}
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private:
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dawnDevice mBackendDevice = nullptr;
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dawnSwapChainImplementation mSwapchainImpl = {};
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};
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BackendBinding* CreateOpenGLBinding() {
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return new OpenGLBinding;
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}
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} // namespace utils
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