AnimTestbed/3rdparty/imgui-node-editor/examples/application/source/renderer_ogl3.cpp

205 lines
6.0 KiB
C++
Raw Normal View History

# include "renderer.h"
# if RENDERER(IMGUI_OGL3)
# include "platform.h"
# include <algorithm>
# if PLATFORM(WINDOWS)
# define NOMINMAX
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# endif
# include "imgui_impl_opengl3.h"
# if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
# include <GL/gl3w.h> // Initialize with gl3wInit()
# elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
# include <GL/glew.h> // Initialize with glewInit()
# elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
# include <glad/glad.h> // Initialize with gladLoadGL()
# elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
# include <glad/gl.h> // Initialize with gladLoadGL(...) or gladLoaderLoadGL()
# elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
# define GLFW_INCLUDE_NONE // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
# include <glbinding/Binding.h> // Initialize with glbinding::Binding::initialize()
# include <glbinding/gl/gl.h>
using namespace gl;
# elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
# define GLFW_INCLUDE_NONE // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
# include <glbinding/glbinding.h>// Initialize with glbinding::initialize()
# include <glbinding/gl/gl.h>
using namespace gl;
# else
# include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
# endif
struct ImTexture
{
GLuint TextureID = 0;
int Width = 0;
int Height = 0;
};
struct RendererOpenGL3 final
: Renderer
{
bool Create(Platform& platform) override;
void Destroy() override;
void NewFrame() override;
void RenderDrawData(ImDrawData* drawData) override;
void Clear(const ImVec4& color) override;
void Present() override;
void Resize(int width, int height) override;
ImVector<ImTexture>::iterator FindTexture(ImTextureID texture);
ImTextureID CreateTexture(const void* data, int width, int height) override;
void DestroyTexture(ImTextureID texture) override;
int GetTextureWidth(ImTextureID texture) override;
int GetTextureHeight(ImTextureID texture) override;
Platform* m_Platform = nullptr;
ImVector<ImTexture> m_Textures;
};
std::unique_ptr<Renderer> CreateRenderer()
{
return std::make_unique<RendererOpenGL3>();
}
bool RendererOpenGL3::Create(Platform& platform)
{
m_Platform = &platform;
// Technically we should initialize OpenGL context here,
// but for now we relay on one created by GLFW3
#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
bool err = gl3wInit() != 0;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
bool err = glewInit() != GLEW_OK;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
bool err = gladLoadGL() == 0;
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
bool err = gladLoadGL(glfwGetProcAddress) == 0; // glad2 recommend using the windowing library loader instead of the (optionally) bundled one.
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
bool err = false;
glbinding::Binding::initialize();
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
bool err = false;
glbinding::initialize([](const char* name) { return (glbinding::ProcAddress)glfwGetProcAddress(name); });
#else
bool err = false; // If you use IMGUI_IMPL_OPENGL_LOADER_CUSTOM, your loader is likely to requires some form of initialization.
#endif
if (err)
return false;
# if PLATFORM(MACOS)
const char* glslVersion = "#version 150";
# else
const char* glslVersion = "#version 130";
# endif
if (!ImGui_ImplOpenGL3_Init(glslVersion))
return false;
m_Platform->SetRenderer(this);
return true;
}
void RendererOpenGL3::Destroy()
{
if (!m_Platform)
return;
m_Platform->SetRenderer(nullptr);
ImGui_ImplOpenGL3_Shutdown();
}
void RendererOpenGL3::NewFrame()
{
ImGui_ImplOpenGL3_NewFrame();
}
void RendererOpenGL3::RenderDrawData(ImDrawData* drawData)
{
ImGui_ImplOpenGL3_RenderDrawData(drawData);
}
void RendererOpenGL3::Clear(const ImVec4& color)
{
glClearColor(color.x, color.y, color.z, color.w);
glClear(GL_COLOR_BUFFER_BIT);
}
void RendererOpenGL3::Present()
{
}
void RendererOpenGL3::Resize(int width, int height)
{
glViewport(0, 0, width, height);
}
ImTextureID RendererOpenGL3::CreateTexture(const void* data, int width, int height)
{
m_Textures.resize(m_Textures.size() + 1);
ImTexture& texture = m_Textures.back();
// Upload texture to graphics system
GLint last_texture = 0;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
glGenTextures(1, &texture.TextureID);
glBindTexture(GL_TEXTURE_2D, texture.TextureID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glBindTexture(GL_TEXTURE_2D, last_texture);
texture.Width = width;
texture.Height = height;
return reinterpret_cast<ImTextureID>(static_cast<std::intptr_t>(texture.TextureID));
}
ImVector<ImTexture>::iterator RendererOpenGL3::FindTexture(ImTextureID texture)
{
auto textureID = static_cast<GLuint>(reinterpret_cast<std::intptr_t>(texture));
return std::find_if(m_Textures.begin(), m_Textures.end(), [textureID](ImTexture& texture)
{
return texture.TextureID == textureID;
});
}
void RendererOpenGL3::DestroyTexture(ImTextureID texture)
{
auto textureIt = FindTexture(texture);
if (textureIt == m_Textures.end())
return;
glDeleteTextures(1, &textureIt->TextureID);
m_Textures.erase(textureIt);
}
int RendererOpenGL3::GetTextureWidth(ImTextureID texture)
{
auto textureIt = FindTexture(texture);
if (textureIt != m_Textures.end())
return textureIt->Width;
return 0;
}
int RendererOpenGL3::GetTextureHeight(ImTextureID texture)
{
auto textureIt = FindTexture(texture);
if (textureIt != m_Textures.end())
return textureIt->Height;
return 0;
}
# endif // RENDERER(IMGUI_OGL3)