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Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998)

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Expecting this to somehow cause another issue but we will fix it when it comes.
This commit is contained in:
ocornut 2021-05-24 23:38:50 +02:00
parent ad5d1a8429
commit 556689591c
3 changed files with 30 additions and 2 deletions
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22
backends/imgui_impl_opengl3.cpp
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@ -13,6 +13,7 @@
// CHANGELOG
// (minor and older changes stripped away, please see git history for details)
// 2021-05-24: OpenGL: Access GL_CLIP_ORIGIN when "GL_ARB_clip_control" extension is detected, inside of just OpenGL 4.5 version.
// 2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
// 2021-04-06: OpenGL: Don't try to read GL_CLIP_ORIGIN unless we're OpenGL 4.5 or greater.
// 2021-02-18: OpenGL: Change blending equation to preserve alpha in output buffer.
@ -144,6 +145,11 @@ using namespace gl;
#define IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
#endif
// Desktop GL use extension detection
#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3)
#define IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS
#endif
// OpenGL Data
static GLuint g_GlVersion = 0; // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2)
static char g_GlslVersionString[32] = ""; // Specified by user or detected based on compile time GL settings.
@ -152,6 +158,7 @@ static GLuint g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
static GLint g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; // Uniforms location
static GLuint g_AttribLocationVtxPos = 0, g_AttribLocationVtxUV = 0, g_AttribLocationVtxColor = 0; // Vertex attributes location
static unsigned int g_VboHandle = 0, g_ElementsHandle = 0;
static bool g_HasClipOrigin = false;
// Functions
bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
@ -231,6 +238,19 @@ bool ImGui_ImplOpenGL3_Init(const char* glsl_version)
GLint current_texture;
glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
// Detect extensions we support
g_HasClipOrigin = (g_GlVersion >= 450);
#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS
GLint num_extensions = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
for (GLint i = 0; i < num_extensions; i++)
{
const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
if (strcmp(extension, "GL_ARB_clip_control") == 0)
g_HasClipOrigin = true;
}
#endif
return true;
}
@ -266,7 +286,7 @@ static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_wid
// Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT)
#if defined(GL_CLIP_ORIGIN)
bool clip_origin_lower_left = true;
if (g_GlVersion >= 450)
if (g_HasClipOrigin)
{
GLenum current_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)&current_clip_origin);
if (current_clip_origin == GL_UPPER_LEFT)

8
docs/CHANGELOG.txt
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@ -31,6 +31,14 @@ HOW TO UPDATE?
- Please report any issue!
-----------------------------------------------------------------------
VERSION 1.84 WIP (In Progress)
-----------------------------------------------------------------------
Other Changes:
- Backends: OpenGL3: Handle GL_CLIP_ORIGIN on <4.5 contexts if "GL_ARB_clip_control" extension is detected. (#4170, #3998)
-----------------------------------------------------------------------
VERSION 1.83 (Released 2011-05-24)
-----------------------------------------------------------------------

2
imgui.h
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@ -61,7 +61,7 @@ Index of this file:
// Version
// (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
#define IMGUI_VERSION "1.83"
#define IMGUI_VERSION_NUM 18300
#define IMGUI_VERSION_NUM 18301
#define IMGUI_CHECKVERSION() ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
#define IMGUI_HAS_TABLE