From 79461eb14ce9631ce5c5ae3ecd7947f9bbae14bf Mon Sep 17 00:00:00 2001
From: Sean Pringle <sean.pringle@gmail.com>
Date: Fri, 24 Jul 2020 15:27:07 +1000
Subject: [PATCH] rlglCheckErrors

---
 src/core.c |  2 ++
 src/rlgl.h | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/src/core.c b/src/core.c
index 54e422c49..16bba2d6b 100644
--- a/src/core.c
+++ b/src/core.c
@@ -1383,6 +1383,8 @@ void EndDrawing(void)
     }
 #endif
 
+    rlglCheckErrors();
+
     SwapBuffers();                  // Copy back buffer to front buffer
     PollInputEvents();              // Poll user events
 
diff --git a/src/rlgl.h b/src/rlgl.h
index 9d6c85c75..c01719e2e 100644
--- a/src/rlgl.h
+++ b/src/rlgl.h
@@ -519,6 +519,7 @@ RLAPI unsigned int rlLoadAttribBuffer(unsigned int vaoId, int shaderLoc, void *b
 RLAPI void rlglInit(int width, int height);           // Initialize rlgl (buffers, shaders, textures, states)
 RLAPI void rlglClose(void);                           // De-inititialize rlgl (buffers, shaders, textures)
 RLAPI void rlglDraw(void);                            // Update and draw default internal buffers
+RLAPI void rlglCheckErrors(void);                     // Check and log OpenGL error codes
 
 RLAPI int rlGetVersion(void);                         // Returns current OpenGL version
 RLAPI bool rlCheckBufferLimit(int vCount);            // Check internal buffer overflow for a given number of vertex
@@ -1797,6 +1798,45 @@ void rlglDraw(void)
 #endif
 }
 
+// Check and log OpenGL error codes
+void rlglCheckErrors() {
+#if defined(GRAPHICS_API_OPENGL_21) || defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
+    int check = 1;
+    while (check) {
+        const GLenum err = glGetError();
+        switch (err) {
+            case GL_NO_ERROR:
+                check = 0;
+                break;
+            case 0x0500: // GL_INVALID_ENUM:
+                TRACELOG(LOG_ERROR, "GL_INVALID_ENUM");
+                break;
+            case 0x0501: //GL_INVALID_VALUE:
+                TRACELOG(LOG_ERROR, "GL_INVALID_VALUE");
+                break;
+            case 0x0502: //GL_INVALID_OPERATION:
+                TRACELOG(LOG_ERROR, "GL_INVALID_OPERATION");
+                break;
+            case 0x0503: // GL_STACK_OVERFLOW:
+                TRACELOG(LOG_ERROR, "GL_STACK_OVERFLOW");
+                break;
+            case 0x0504: // GL_STACK_UNDERFLOW:
+                TRACELOG(LOG_ERROR, "GL_STACK_UNDERFLOW");
+                break;
+            case 0x0505: // GL_OUT_OF_MEMORY:
+                TRACELOG(LOG_ERROR, "GL_OUT_OF_MEMORY");
+                break;
+            case 0x0506: // GL_INVALID_FRAMEBUFFER_OPERATION:
+                TRACELOG(LOG_ERROR, "GL_INVALID_FRAMEBUFFER_OPERATION");
+                break;
+            default:
+                TRACELOG(LOG_ERROR, "unknown GL error %x", err);
+                break;
+        }
+    }
+#endif
+}
+
 // Returns current OpenGL version
 int rlGetVersion(void)
 {