Support create OpenGL debug context in OpenGL 4.3 (#2068)

* - support create OpenGL debug context in OpenGL 4.3

* - additional events in debug message
- fixed glEnable(GL_DEBUG_OUTPUT)

* Reviewed OpenGL Debug Context

3 files changed, 70 insertions, 0 deletions

diff --git a/src/config.h b/src/config.h
index 931fdf5b..5cb50903 100644
--- a/src/config.h
+++ b/src/config.h
@@ -84,6 +84,10 @@
 //------------------------------------------------------------------------------------
 // Module: rlgl - Configuration values
 //------------------------------------------------------------------------------------
+
+// Enable OpenGL Debug Context (only OpenGL 4.3)
+//#define RLGL_ENABLE_OPENGL_DEBUG_CONTEXT       1
+
 // Show OpenGL extensions and capabilities detailed logs on init
 //#define RLGL_SHOW_GL_DETAILS_INFO        1
 
diff --git a/src/rcore.c b/src/rcore.c
index 0af89cf7..0d1a75ff 100644
--- a/src/rcore.c
+++ b/src/rcore.c
@@ -3858,6 +3858,10 @@ static bool InitGraphicsDevice(int width, int height)
         glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);          // Choose OpenGL minor version (just hint)
         glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
         glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_FALSE);
+
+#if defined(RLGL_ENABLE_OPENGL_DEBUG_CONTEXT)
+        glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE);   // Enable OpenGL Debug Context
+#endif
     }
     else if (rlGetVersion() == OPENGL_ES_20)                    // Request OpenGL ES 2.0 context
     {
diff --git a/src/rlgl.h b/src/rlgl.h
index 1641ec15..e67e1004 100644
--- a/src/rlgl.h
+++ b/src/rlgl.h
@@ -1798,12 +1798,74 @@ void rlSetBlendFactors(int glSrcFactor, int glDstFactor, int glEquation)
 }
 
 //----------------------------------------------------------------------------------
+// Module Functions Definition - OpenGL Debug
+//----------------------------------------------------------------------------------
+
+#if defined(RLGL_ENABLE_OPENGL_DEBUG_CONTEXT) && defined(GRAPHICS_API_OPENGL_43)
+static void GLAPIENTRY rlDebugMessageCallback(GLenum source, GLenum type, GLuint id, GLenum severity, GLsizei length, const GLchar *message, const void *userParam)
+{
+    // ignore non-significant error/warning codes
+    if (id == 131169 || id == 131185 || id == 131218 || id == 131204) return;
+
+    const char *msgSource = NULL;
+    switch (source)
+    {
+    case GL_DEBUG_SOURCE_API:             msgSource = "API"; break;
+    case GL_DEBUG_SOURCE_WINDOW_SYSTEM:   msgSource = "WINDOW_SYSTEM"; break;
+    case GL_DEBUG_SOURCE_SHADER_COMPILER: msgSource = "SHADER_COMPILER"; break;
+    case GL_DEBUG_SOURCE_THIRD_PARTY:     msgSource = "THIRD_PARTY"; break;
+    case GL_DEBUG_SOURCE_APPLICATION:     msgSource = "APPLICATION"; break;
+    case GL_DEBUG_SOURCE_OTHER:           msgSource = "OTHER"; break;
+    }
+
+    const char *msgType = NULL;
+    switch (type)
+    {
+    case GL_DEBUG_TYPE_ERROR:               msgType = "ERROR"; break;
+    case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR: msgType = "DEPRECATED_BEHAVIOR"; break;
+    case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR:  msgType = "UNDEFINED_BEHAVIOR"; break;
+    case GL_DEBUG_TYPE_PORTABILITY:         msgType = "PORTABILITY"; break;
+    case GL_DEBUG_TYPE_PERFORMANCE:         msgType = "PERFORMANCE"; break;
+    case GL_DEBUG_TYPE_MARKER:              msgType = "MARKER"; break;
+    case GL_DEBUG_TYPE_PUSH_GROUP:          msgType = "PUSH_GROUP"; break;
+    case GL_DEBUG_TYPE_POP_GROUP:           msgType = "POP_GROUP"; break;
+    case GL_DEBUG_TYPE_OTHER:               msgType = "OTHER"; break;
+    }
+
+    const char *msgSeverity = "DEFAULT";
+    switch (severity)
+    {
+    case GL_DEBUG_SEVERITY_LOW:          msgSeverity = "LOW"; break;
+    case GL_DEBUG_SEVERITY_MEDIUM:       msgSeverity = "MEDIUM"; break;
+    case GL_DEBUG_SEVERITY_HIGH:         msgSeverity = "HIGH"; break;
+    case GL_DEBUG_SEVERITY_NOTIFICATION: msgSeverity = "NOTIFICATION"; break;
+    }
+
+    TRACELOG(LOG_WARNING, "OpenGL Debug Message: %s, type = %s, source = %s, severity = %s", message, msgType, msgSource, msgSeverity);
+}
+#endif
+
+//----------------------------------------------------------------------------------
 // Module Functions Definition - rlgl functionality
 //----------------------------------------------------------------------------------
 
 // Initialize rlgl: OpenGL extensions, default buffers/shaders/textures, OpenGL states
 void rlglInit(int width, int height)
 {
+    // Enable OpenGL Debug Context
+#if defined(RLGL_ENABLE_OPENGL_DEBUG_CONTEXT) && defined(GRAPHICS_API_OPENGL_43)
+    if (glDebugMessageCallback != NULL && glDebugMessageControl != NULL)
+    {
+        glDebugMessageCallback(rlDebugMessageCallback, 0);
+        // glDebugMessageControl(GL_DEBUG_SOURCE_API, GL_DEBUG_TYPE_ERROR, GL_DEBUG_SEVERITY_HIGH, 0, 0, GL_TRUE); // TODO: filter message
+
+        // GL_DEBUG_OUTPUT - Faster version but not useful for breakpoints
+        // GL_DEBUG_OUTPUT_SYNCHRONUS - Callback is in sync with errors, so a breakpoint can be placed on the callback in order to get a stacktrace for the GL error.
+        glEnable(GL_DEBUG_OUTPUT);
+        glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
+    }
+#endif
+
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
     // Init default white texture
     unsigned char pixels[4] = { 255, 255, 255, 255 };   // 1 pixel RGBA (4 bytes)