mirror of
https://github.com/ocornut/imgui.git
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Merge branch 'features/backends_context' into docking
# Conflicts: # backends/imgui_impl_dx10.cpp # backends/imgui_impl_dx11.cpp # backends/imgui_impl_dx12.cpp # backends/imgui_impl_dx9.cpp # backends/imgui_impl_glfw.cpp # backends/imgui_impl_opengl2.cpp # backends/imgui_impl_opengl3.cpp # backends/imgui_impl_sdl.cpp # backends/imgui_impl_vulkan.cpp # backends/imgui_impl_win32.cpp # examples/example_apple_opengl2/main.mm
This commit is contained in:
ocornut
@@ -16,6 +16,8 @@
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// CHANGELOG
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// (minor and older changes stripped away, please see git history for details)
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// 2021-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
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// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
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// 2021-06-25: OpenGL: Use OES_vertex_array extension on Emscripten + backup/restore current state.
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// 2021-06-21: OpenGL: Destroy individual vertex/fragment shader objects right after they are linked into the main shader.
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// 2021-05-24: OpenGL: Access GL_CLIP_ORIGIN when "GL_ARB_clip_control" extension is detected, inside of just OpenGL 4.5 version.
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// 2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
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@@ -96,6 +98,12 @@
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// GL includes
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#if defined(IMGUI_IMPL_OPENGL_ES2)
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#include <GLES2/gl2.h>
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#if defined(__EMSCRIPTEN__)
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#ifndef GL_GLEXT_PROTOTYPES
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#define GL_GLEXT_PROTOTYPES
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#endif
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#include <GLES2/gl2ext.h>
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#endif
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#elif defined(IMGUI_IMPL_OPENGL_ES3)
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#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV))
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#include <OpenGLES/ES3/gl.h> // Use GL ES 3
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@@ -134,6 +142,17 @@ using namespace gl;
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#endif
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#endif
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// Vertex arrays are not supported on ES2/WebGL1 unless Emscripten which uses an extension
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#ifndef IMGUI_IMPL_OPENGL_ES2
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#define IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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#elif defined(__EMSCRIPTEN__)
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#define IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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#define glBindVertexArray glBindVertexArrayOES
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#define glGenVertexArrays glGenVertexArraysOES
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#define glDeleteVertexArrays glDeleteVertexArraysOES
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#define GL_VERTEX_ARRAY_BINDING GL_VERTEX_ARRAY_BINDING_OES
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#endif
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// Desktop GL 3.2+ has glDrawElementsBaseVertex() which GL ES and WebGL don't have.
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#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_2)
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#define IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
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@@ -155,14 +174,28 @@ using namespace gl;
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#endif
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// OpenGL Data
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static GLuint g_GlVersion = 0; // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2)
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static char g_GlslVersionString[32] = ""; // Specified by user or detected based on compile time GL settings.
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static GLuint g_FontTexture = 0;
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static GLuint g_ShaderHandle = 0;
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static GLint g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; // Uniforms location
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static GLuint g_AttribLocationVtxPos = 0, g_AttribLocationVtxUV = 0, g_AttribLocationVtxColor = 0; // Vertex attributes location
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static unsigned int g_VboHandle = 0, g_ElementsHandle = 0;
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static bool g_HasClipOrigin = false;
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struct ImGui_ImplOpenGL3_Data
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{
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GLuint GlVersion; // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2)
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char GlslVersionString[32]; // Specified by user or detected based on compile time GL settings.
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GLuint FontTexture;
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GLuint ShaderHandle;
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GLint AttribLocationTex; // Uniforms location
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GLint AttribLocationProjMtx;
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GLuint AttribLocationVtxPos; // Vertex attributes location
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GLuint AttribLocationVtxUV;
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GLuint AttribLocationVtxColor;
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unsigned int VboHandle, ElementsHandle;
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bool HasClipOrigin;
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ImGui_ImplOpenGL3_Data() { memset(this, 0, sizeof(*this)); }
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};
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// Wrapping access to backend data (to facilitate multiple-contexts stored in io.BackendPlatformUserData)
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static ImGui_ImplOpenGL3_Data* g_Data;
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static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_CreateBackendData() { IM_ASSERT(g_Data == NULL); g_Data = IM_NEW(ImGui_ImplOpenGL3_Data); return g_Data; }
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static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_GetBackendData() { IM_ASSERT(ImGui::GetCurrentContext() != NULL); return g_Data; }
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static void ImGui_ImplOpenGL3_DestroyBackendData() { IM_DELETE(g_Data); g_Data = NULL; }
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// Forward Declarations
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static void ImGui_ImplOpenGL3_InitPlatformInterface();
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@@ -171,6 +204,11 @@ static void ImGui_ImplOpenGL3_ShutdownPlatformInterface();
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// Functions
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bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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{
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
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ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_CreateBackendData();
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// Query for GL version (e.g. 320 for GL 3.2)
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#if !defined(IMGUI_IMPL_OPENGL_ES2)
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GLint major = 0;
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@@ -183,16 +221,16 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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const char* gl_version = (const char*)glGetString(GL_VERSION);
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sscanf(gl_version, "%d.%d", &major, &minor);
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}
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g_GlVersion = (GLuint)(major * 100 + minor * 10);
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bd->GlVersion = (GLuint)(major * 100 + minor * 10);
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#else
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g_GlVersion = 200; // GLES 2
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bd->GlVersion = 200; // GLES 2
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#endif
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// Setup backend capabilities flags
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ImGuiIO& io = ImGui::GetIO();
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io.BackendRendererUserData = (void*)bd;
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io.BackendRendererName = "imgui_impl_opengl3";
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
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if (g_GlVersion >= 320)
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if (bd->GlVersion >= 320)
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io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
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#endif
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io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports; // We can create multi-viewports on the Renderer side (optional)
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@@ -212,9 +250,9 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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if (glsl_version == NULL)
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glsl_version = "#version 130";
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#endif
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IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(g_GlslVersionString));
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strcpy(g_GlslVersionString, glsl_version);
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strcat(g_GlslVersionString, "\n");
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IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(bd->GlslVersionString));
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strcpy(bd->GlslVersionString, glsl_version);
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strcat(bd->GlslVersionString, "\n");
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// Debugging construct to make it easily visible in the IDE and debugger which GL loader has been selected.
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// The code actually never uses the 'gl_loader' variable! It is only here so you can read it!
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@@ -248,7 +286,7 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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glGetIntegerv(GL_TEXTURE_BINDING_2D, ¤t_texture);
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// Detect extensions we support
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g_HasClipOrigin = (g_GlVersion >= 450);
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bd->HasClipOrigin = (bd->GlVersion >= 450);
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS
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GLint num_extensions = 0;
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glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
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@@ -256,7 +294,7 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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{
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const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
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if (extension != NULL && strcmp(extension, "GL_ARB_clip_control") == 0)
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g_HasClipOrigin = true;
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bd->HasClipOrigin = true;
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}
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#endif
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@@ -268,18 +306,26 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
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void ImGui_ImplOpenGL3_Shutdown()
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{
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplOpenGL3_ShutdownPlatformInterface();
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ImGui_ImplOpenGL3_DestroyDeviceObjects();
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io.BackendRendererName = NULL;
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io.BackendRendererUserData = NULL;
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ImGui_ImplOpenGL3_DestroyBackendData();
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}
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void ImGui_ImplOpenGL3_NewFrame()
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{
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if (!g_ShaderHandle)
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ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
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if (!bd->ShaderHandle)
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ImGui_ImplOpenGL3_CreateDeviceObjects();
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}
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static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object)
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{
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ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
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// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill
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glEnable(GL_BLEND);
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glBlendEquation(GL_FUNC_ADD);
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@@ -289,7 +335,7 @@ static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_wid
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glDisable(GL_STENCIL_TEST);
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glEnable(GL_SCISSOR_TEST);
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
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if (g_GlVersion >= 310)
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if (bd->GlVersion >= 310)
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glDisable(GL_PRIMITIVE_RESTART);
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#endif
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#ifdef GL_POLYGON_MODE
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@@ -299,7 +345,7 @@ static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_wid
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// Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT)
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#if defined(GL_CLIP_ORIGIN)
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bool clip_origin_lower_left = true;
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if (g_HasClipOrigin)
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if (bd->HasClipOrigin)
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{
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GLenum current_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)¤t_clip_origin);
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if (current_clip_origin == GL_UPPER_LEFT)
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@@ -324,29 +370,29 @@ static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_wid
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{ 0.0f, 0.0f, -1.0f, 0.0f },
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{ (R+L)/(L-R), (T+B)/(B-T), 0.0f, 1.0f },
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};
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glUseProgram(g_ShaderHandle);
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glUniform1i(g_AttribLocationTex, 0);
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glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]);
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glUseProgram(bd->ShaderHandle);
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glUniform1i(bd->AttribLocationTex, 0);
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glUniformMatrix4fv(bd->AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]);
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
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if (g_GlVersion >= 330)
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if (bd->GlVersion >= 330)
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glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise.
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#endif
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(void)vertex_array_object;
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#ifndef IMGUI_IMPL_OPENGL_ES2
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#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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glBindVertexArray(vertex_array_object);
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#endif
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// Bind vertex/index buffers and setup attributes for ImDrawVert
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glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle);
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glEnableVertexAttribArray(g_AttribLocationVtxPos);
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glEnableVertexAttribArray(g_AttribLocationVtxUV);
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glEnableVertexAttribArray(g_AttribLocationVtxColor);
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glVertexAttribPointer(g_AttribLocationVtxPos, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos));
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glVertexAttribPointer(g_AttribLocationVtxUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv));
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glVertexAttribPointer(g_AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col));
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glBindBuffer(GL_ARRAY_BUFFER, bd->VboHandle);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bd->ElementsHandle);
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glEnableVertexAttribArray(bd->AttribLocationVtxPos);
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glEnableVertexAttribArray(bd->AttribLocationVtxUV);
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glEnableVertexAttribArray(bd->AttribLocationVtxColor);
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glVertexAttribPointer(bd->AttribLocationVtxPos, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos));
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glVertexAttribPointer(bd->AttribLocationVtxUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv));
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glVertexAttribPointer(bd->AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col));
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}
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// OpenGL3 Render function.
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@@ -360,16 +406,18 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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if (fb_width <= 0 || fb_height <= 0)
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return;
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ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
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// Backup GL state
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GLenum last_active_texture; glGetIntegerv(GL_ACTIVE_TEXTURE, (GLint*)&last_active_texture);
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glActiveTexture(GL_TEXTURE0);
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GLuint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&last_program);
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GLuint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&last_texture);
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
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GLuint last_sampler; if (g_GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; }
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GLuint last_sampler; if (bd->GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; }
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#endif
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GLuint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, (GLint*)&last_array_buffer);
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#ifndef IMGUI_IMPL_OPENGL_ES2
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#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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GLuint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, (GLint*)&last_vertex_array_object);
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#endif
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#ifdef GL_POLYGON_MODE
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@@ -389,14 +437,14 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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GLboolean last_enable_stencil_test = glIsEnabled(GL_STENCIL_TEST);
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GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST);
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
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GLboolean last_enable_primitive_restart = (g_GlVersion >= 310) ? glIsEnabled(GL_PRIMITIVE_RESTART) : GL_FALSE;
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GLboolean last_enable_primitive_restart = (bd->GlVersion >= 310) ? glIsEnabled(GL_PRIMITIVE_RESTART) : GL_FALSE;
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#endif
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// Setup desired GL state
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// Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts)
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// The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound.
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GLuint vertex_array_object = 0;
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#ifndef IMGUI_IMPL_OPENGL_ES2
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#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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glGenVertexArrays(1, &vertex_array_object);
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#endif
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ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
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@@ -443,7 +491,7 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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// Bind texture, Draw
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glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID());
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
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if (g_GlVersion >= 320)
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if (bd->GlVersion >= 320)
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glDrawElementsBaseVertex(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)), (GLint)pcmd->VtxOffset);
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else
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#endif
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@@ -454,7 +502,7 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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}
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// Destroy the temporary VAO
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#ifndef IMGUI_IMPL_OPENGL_ES2
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#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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glDeleteVertexArrays(1, &vertex_array_object);
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#endif
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@@ -462,11 +510,11 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
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glUseProgram(last_program);
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glBindTexture(GL_TEXTURE_2D, last_texture);
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#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
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if (g_GlVersion >= 330)
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if (bd->GlVersion >= 330)
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glBindSampler(0, last_sampler);
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#endif
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glActiveTexture(last_active_texture);
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#ifndef IMGUI_IMPL_OPENGL_ES2
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#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
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glBindVertexArray(last_vertex_array_object);
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#endif
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glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
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@@ -478,7 +526,7 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
|
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if (last_enable_stencil_test) glEnable(GL_STENCIL_TEST); else glDisable(GL_STENCIL_TEST);
|
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if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
|
||||
#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
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||||
if (g_GlVersion >= 310) { if (last_enable_primitive_restart) glEnable(GL_PRIMITIVE_RESTART); else glDisable(GL_PRIMITIVE_RESTART); }
|
||||
if (bd->GlVersion >= 310) { if (last_enable_primitive_restart) glEnable(GL_PRIMITIVE_RESTART); else glDisable(GL_PRIMITIVE_RESTART); }
|
||||
#endif
|
||||
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||||
#ifdef GL_POLYGON_MODE
|
||||
@@ -490,8 +538,10 @@ void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
|
||||
|
||||
bool ImGui_ImplOpenGL3_CreateFontsTexture()
|
||||
{
|
||||
// Build texture atlas
|
||||
ImGuiIO& io = ImGui::GetIO();
|
||||
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
|
||||
|
||||
// Build texture atlas
|
||||
unsigned char* pixels;
|
||||
int width, height;
|
||||
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
|
||||
@@ -499,8 +549,8 @@ bool ImGui_ImplOpenGL3_CreateFontsTexture()
|
||||
// Upload texture to graphics system
|
||||
GLint last_texture;
|
||||
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
|
||||
glGenTextures(1, &g_FontTexture);
|
||||
glBindTexture(GL_TEXTURE_2D, g_FontTexture);
|
||||
glGenTextures(1, &bd->FontTexture);
|
||||
glBindTexture(GL_TEXTURE_2D, bd->FontTexture);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
#ifdef GL_UNPACK_ROW_LENGTH
|
||||
@@ -509,7 +559,7 @@ bool ImGui_ImplOpenGL3_CreateFontsTexture()
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
|
||||
|
||||
// Store our identifier
|
||||
io.Fonts->SetTexID((ImTextureID)(intptr_t)g_FontTexture);
|
||||
io.Fonts->SetTexID((ImTextureID)(intptr_t)bd->FontTexture);
|
||||
|
||||
// Restore state
|
||||
glBindTexture(GL_TEXTURE_2D, last_texture);
|
||||
@@ -519,23 +569,25 @@ bool ImGui_ImplOpenGL3_CreateFontsTexture()
|
||||
|
||||
void ImGui_ImplOpenGL3_DestroyFontsTexture()
|
||||
{
|
||||
if (g_FontTexture)
|
||||
ImGuiIO& io = ImGui::GetIO();
|
||||
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
|
||||
if (bd->FontTexture)
|
||||
{
|
||||
ImGuiIO& io = ImGui::GetIO();
|
||||
glDeleteTextures(1, &g_FontTexture);
|
||||
glDeleteTextures(1, &bd->FontTexture);
|
||||
io.Fonts->SetTexID(0);
|
||||
g_FontTexture = 0;
|
||||
bd->FontTexture = 0;
|
||||
}
|
||||
}
|
||||
|
||||
// If you get an error please report on github. You may try different GL context version or GLSL version. See GL<>GLSL version table at the top of this file.
|
||||
static bool CheckShader(GLuint handle, const char* desc)
|
||||
{
|
||||
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
|
||||
GLint status = 0, log_length = 0;
|
||||
glGetShaderiv(handle, GL_COMPILE_STATUS, &status);
|
||||
glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &log_length);
|
||||
if ((GLboolean)status == GL_FALSE)
|
||||
fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile %s!\n", desc);
|
||||
fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile %s! With GLSL: %s\n", desc, bd->GlslVersionString);
|
||||
if (log_length > 1)
|
||||
{
|
||||
ImVector<char> buf;
|
||||
@@ -549,11 +601,12 @@ static bool CheckShader(GLuint handle, const char* desc)
|
||||
// If you get an error please report on GitHub. You may try different GL context version or GLSL version.
|
||||
static bool CheckProgram(GLuint handle, const char* desc)
|
||||
{
|
||||
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
|
||||
GLint status = 0, log_length = 0;
|
||||
glGetProgramiv(handle, GL_LINK_STATUS, &status);
|
||||
glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &log_length);
|
||||
if ((GLboolean)status == GL_FALSE)
|
||||
fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! (with GLSL '%s')\n", desc, g_GlslVersionString);
|
||||
fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! With GLSL %s\n", desc, bd->GlslVersionString);
|
||||
if (log_length > 1)
|
||||
{
|
||||
ImVector<char> buf;
|
||||
@@ -566,18 +619,20 @@ static bool CheckProgram(GLuint handle, const char* desc)
|
||||
|
||||
bool ImGui_ImplOpenGL3_CreateDeviceObjects()
|
||||
{
|
||||
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
|
||||
|
||||
// Backup GL state
|
||||
GLint last_texture, last_array_buffer;
|
||||
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
|
||||
glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
|
||||
#ifndef IMGUI_IMPL_OPENGL_ES2
|
||||
#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
|
||||
GLint last_vertex_array;
|
||||
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
|
||||
#endif
|
||||
|
||||
// Parse GLSL version string
|
||||
int glsl_version = 130;
|
||||
sscanf(g_GlslVersionString, "#version %d", &glsl_version);
|
||||
sscanf(bd->GlslVersionString, "#version %d", &glsl_version);
|
||||
|
||||
const GLchar* vertex_shader_glsl_120 =
|
||||
"uniform mat4 ProjMtx;\n"
|
||||
@@ -704,46 +759,46 @@ bool ImGui_ImplOpenGL3_CreateDeviceObjects()
|
||||
}
|
||||
|
||||
// Create shaders
|
||||
const GLchar* vertex_shader_with_version[2] = { g_GlslVersionString, vertex_shader };
|
||||
const GLchar* vertex_shader_with_version[2] = { bd->GlslVersionString, vertex_shader };
|
||||
GLuint vert_handle = glCreateShader(GL_VERTEX_SHADER);
|
||||
glShaderSource(vert_handle, 2, vertex_shader_with_version, NULL);
|
||||
glCompileShader(vert_handle);
|
||||
CheckShader(vert_handle, "vertex shader");
|
||||
|
||||
const GLchar* fragment_shader_with_version[2] = { g_GlslVersionString, fragment_shader };
|
||||
const GLchar* fragment_shader_with_version[2] = { bd->GlslVersionString, fragment_shader };
|
||||
GLuint frag_handle = glCreateShader(GL_FRAGMENT_SHADER);
|
||||
glShaderSource(frag_handle, 2, fragment_shader_with_version, NULL);
|
||||
glCompileShader(frag_handle);
|
||||
CheckShader(frag_handle, "fragment shader");
|
||||
|
||||
// Link
|
||||
g_ShaderHandle = glCreateProgram();
|
||||
glAttachShader(g_ShaderHandle, vert_handle);
|
||||
glAttachShader(g_ShaderHandle, frag_handle);
|
||||
glLinkProgram(g_ShaderHandle);
|
||||
CheckProgram(g_ShaderHandle, "shader program");
|
||||
bd->ShaderHandle = glCreateProgram();
|
||||
glAttachShader(bd->ShaderHandle, vert_handle);
|
||||
glAttachShader(bd->ShaderHandle, frag_handle);
|
||||
glLinkProgram(bd->ShaderHandle);
|
||||
CheckProgram(bd->ShaderHandle, "shader program");
|
||||
|
||||
glDetachShader(g_ShaderHandle, vert_handle);
|
||||
glDetachShader(g_ShaderHandle, frag_handle);
|
||||
glDetachShader(bd->ShaderHandle, vert_handle);
|
||||
glDetachShader(bd->ShaderHandle, frag_handle);
|
||||
glDeleteShader(vert_handle);
|
||||
glDeleteShader(frag_handle);
|
||||
|
||||
g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture");
|
||||
g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx");
|
||||
g_AttribLocationVtxPos = (GLuint)glGetAttribLocation(g_ShaderHandle, "Position");
|
||||
g_AttribLocationVtxUV = (GLuint)glGetAttribLocation(g_ShaderHandle, "UV");
|
||||
g_AttribLocationVtxColor = (GLuint)glGetAttribLocation(g_ShaderHandle, "Color");
|
||||
bd->AttribLocationTex = glGetUniformLocation(bd->ShaderHandle, "Texture");
|
||||
bd->AttribLocationProjMtx = glGetUniformLocation(bd->ShaderHandle, "ProjMtx");
|
||||
bd->AttribLocationVtxPos = (GLuint)glGetAttribLocation(bd->ShaderHandle, "Position");
|
||||
bd->AttribLocationVtxUV = (GLuint)glGetAttribLocation(bd->ShaderHandle, "UV");
|
||||
bd->AttribLocationVtxColor = (GLuint)glGetAttribLocation(bd->ShaderHandle, "Color");
|
||||
|
||||
// Create buffers
|
||||
glGenBuffers(1, &g_VboHandle);
|
||||
glGenBuffers(1, &g_ElementsHandle);
|
||||
glGenBuffers(1, &bd->VboHandle);
|
||||
glGenBuffers(1, &bd->ElementsHandle);
|
||||
|
||||
ImGui_ImplOpenGL3_CreateFontsTexture();
|
||||
|
||||
// Restore modified GL state
|
||||
glBindTexture(GL_TEXTURE_2D, last_texture);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
|
||||
#ifndef IMGUI_IMPL_OPENGL_ES2
|
||||
#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
|
||||
glBindVertexArray(last_vertex_array);
|
||||
#endif
|
||||
|
||||
@@ -752,10 +807,10 @@ bool ImGui_ImplOpenGL3_CreateDeviceObjects()
|
||||
|
||||
void ImGui_ImplOpenGL3_DestroyDeviceObjects()
|
||||
{
|
||||
if (g_VboHandle) { glDeleteBuffers(1, &g_VboHandle); g_VboHandle = 0; }
|
||||
if (g_ElementsHandle) { glDeleteBuffers(1, &g_ElementsHandle); g_ElementsHandle = 0; }
|
||||
if (g_ShaderHandle) { glDeleteProgram(g_ShaderHandle); g_ShaderHandle = 0; }
|
||||
|
||||
ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
|
||||
if (bd->VboHandle) { glDeleteBuffers(1, &bd->VboHandle); bd->VboHandle = 0; }
|
||||
if (bd->ElementsHandle) { glDeleteBuffers(1, &bd->ElementsHandle); bd->ElementsHandle = 0; }
|
||||
if (bd->ShaderHandle) { glDeleteProgram(bd->ShaderHandle); bd->ShaderHandle = 0; }
|
||||
ImGui_ImplOpenGL3_DestroyFontsTexture();
|
||||
}
|
||||
|
||||
|
||||
Reference in New Issue
Block a user