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Remove OpenGLBinding's dependency on glad

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This move all the OpenGL-specific code for swapchain handling in a new
NativeSwapChainImpl in the OpenGL backend so no code outside of
dawn_native needs OpenGL.

BUG=dawn:165

Change-Id: I3c0c1055e3215a59fdc8e9550baf30762a7014b5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/8161
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
This commit is contained in:
Corentin Wallez
2019-06-17 09:01:09 +00:00
committed by Commit Bot service account
parent 21eba761b5
commit abdb566c30
6 changed files with 180 additions and 73 deletions
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77
src/utils/OpenGLBinding.cpp
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@@ -20,95 +20,28 @@
#include "dawn/dawn_wsi.h"
#include "dawn_native/OpenGLBackend.h"
// Glad needs to be included before GLFW otherwise it complain that GL.h was already included
#include "glad/glad.h"
#include <cstdio>
#include "GLFW/glfw3.h"
namespace utils {
class SwapChainImplGL {
public:
using WSIContext = DawnWSIContextGL;
SwapChainImplGL(GLFWwindow* window) : mWindow(window) {
}
~SwapChainImplGL() {
glDeleteTextures(1, &mBackTexture);
glDeleteFramebuffers(1, &mBackFBO);
}
void Init(DawnWSIContextGL*) {
glGenTextures(1, &mBackTexture);
glBindTexture(GL_TEXTURE_2D, mBackTexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
glGenFramebuffers(1, &mBackFBO);
glBindFramebuffer(GL_READ_FRAMEBUFFER, mBackFBO);
glFramebufferTexture2D(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
mBackTexture, 0);
}
DawnSwapChainError Configure(DawnTextureFormat format,
DawnTextureUsageBit,
uint32_t width,
uint32_t height) {
if (format != DAWN_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM) {
return "unsupported format";
}
ASSERT(width > 0);
ASSERT(height > 0);
mWidth = width;
mHeight = height;
glBindTexture(GL_TEXTURE_2D, mBackTexture);
// Reallocate the texture
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE,
nullptr);
return DAWN_SWAP_CHAIN_NO_ERROR;
}
DawnSwapChainError GetNextTexture(DawnSwapChainNextTexture* nextTexture) {
nextTexture->texture.u32 = mBackTexture;
return DAWN_SWAP_CHAIN_NO_ERROR;
}
DawnSwapChainError Present() {
glBindFramebuffer(GL_READ_FRAMEBUFFER, mBackFBO);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBlitFramebuffer(0, 0, mWidth, mHeight, 0, mHeight, mWidth, 0, GL_COLOR_BUFFER_BIT,
GL_NEAREST);
glfwSwapBuffers(mWindow);
return DAWN_SWAP_CHAIN_NO_ERROR;
}
private:
GLFWwindow* mWindow = nullptr;
uint32_t mWidth = 0;
uint32_t mHeight = 0;
GLuint mBackFBO = 0;
GLuint mBackTexture = 0;
};
class OpenGLBinding : public BackendBinding {
public:
OpenGLBinding(GLFWwindow* window, DawnDevice device) : BackendBinding(window, device) {
// Load the GL entry points in our copy of the glad static library
gladLoadGLLoader(reinterpret_cast<GLADloadproc>(glfwGetProcAddress));
}
uint64_t GetSwapChainImplementation() override {
if (mSwapchainImpl.userData == nullptr) {
mSwapchainImpl = CreateSwapChainImplementation(new SwapChainImplGL(mWindow));
mSwapchainImpl = dawn_native::opengl::CreateNativeSwapChainImpl(
mDevice,
[](void* userdata) { glfwSwapBuffers(static_cast<GLFWwindow*>(userdata)); },
mWindow);
}
return reinterpret_cast<uint64_t>(&mSwapchainImpl);
}
DawnTextureFormat GetPreferredSwapChainTextureFormat() override {
return DAWN_TEXTURE_FORMAT_R8_G8_B8_A8_UNORM;
return dawn_native::opengl::GetNativeSwapChainPreferredFormat(&mSwapchainImpl);
}
private: