Add GLFW_CONTEXT_NO_ERROR window hint

This adds support for the GL_KHR_no_error extension.

README.md

@@ -67,6 +67,7 @@ used by the tests and examples and are not required to build the library.
  - Added `glfwSetWindowSizeLimits` and `glfwSetWindowAspectRatio` for setting
    absolute and relative window size limits
  - Added `GLFW_NO_API` for creating window without contexts
+ - Added `GLFW_CONTEXT_NO_ERROR` context hint for `GL_KHR_no_error` support
  - Added `GLFW_TRUE` and `GLFW_FALSE` as client API independent boolean values
  - Removed dependency on external OpenGL or OpenGL ES headers
  - [Cocoa] Removed support for OS X 10.6

docs/news.dox

@@ -4,6 +4,7 @@
 
 @section news_32 New features in 3.2
 
+
 @subsection news_32_sizelimits Window size limit support
 
 GLFW now supports setting both absolute and relative window size limits with

docs/window.dox

@@ -293,6 +293,15 @@ Context release behaviors are described in detail by the
 [GL_KHR_context_flush_control](https://www.opengl.org/registry/specs/KHR/context_flush_control.txt)
 extension.
 
+`GLFW_CONTEXT_NO_ERROR` specifies whether errors should be generated by the
+context.  If enabled, situations that would have generated errors instead cause
+undefined behavior.
+
+@par
+The no error mode for OpenGL and OpenGL ES is described in detail by the
+[GL_KHR_no_error](https://www.opengl.org/registry/specs/KHR/no_error.txt)
+extension.
+
 
 @subsubsection window_hints_values Supported and default values
 

include/GLFW/glfw3.h

@@ -658,6 +658,7 @@ extern "C" {
 #define GLFW_OPENGL_DEBUG_CONTEXT   0x00022007
 #define GLFW_OPENGL_PROFILE         0x00022008
 #define GLFW_CONTEXT_RELEASE_BEHAVIOR 0x00022009
+#define GLFW_CONTEXT_NO_ERROR       0x0002200A
 
 #define GLFW_NO_API                          0
 #define GLFW_OPENGL_API             0x00030001

src/context.c

@@ -403,6 +403,9 @@ GLFWbool _glfwRefreshContextAttribs(const _GLFWctxconfig* ctxconfig)
                 //       debug contexts
                 window->context.debug = GLFW_TRUE;
             }
+
+            if (flags & GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR)
+                window->context.noerror = GLFW_TRUE;
         }
 
         // Read back OpenGL context profile (OpenGL 3.2 and above)

src/egl_context.c

@@ -264,6 +264,8 @@ int _glfwInitContextAPI(void)
 
     _glfw.egl.KHR_create_context =
         _glfwPlatformExtensionSupported("EGL_KHR_create_context");
+    _glfw.egl.KHR_create_context_no_error =
+        _glfwPlatformExtensionSupported("EGL_KHR_create_context_no_error");
 
     return GLFW_TRUE;
 }
@@ -345,6 +347,12 @@ int _glfwCreateContext(_GLFWwindow* window,
                 mask |= EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
             else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
                 mask |= EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;
+
+            if (_glfw.egl.KHR_create_context_no_error)
+            {
+                if (ctxconfig->noerror)
+                    flags |= EGL_CONTEXT_OPENGL_NO_ERROR_KHR;
+            }
         }
 
         if (ctxconfig->debug)

src/egl_context.h

@@ -88,6 +88,7 @@
 #define EGL_CONTEXT_MINOR_VERSION_KHR 0x30fb
 #define EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR 0x30FD
 #define EGL_CONTEXT_FLAGS_KHR 0x30fc
+#define EGL_CONTEXT_OPENGL_NO_ERROR_KHR 0x31b3
 #define EGL_NATIVE_VISUAL_ID 0x302e
 #define EGL_NO_SURFACE ((EGLSurface) 0)
 #define EGL_NO_DISPLAY ((EGLDisplay) 0)
@@ -160,6 +161,7 @@ typedef struct _GLFWlibraryEGL
     EGLint          major, minor;
 
     GLFWbool        KHR_create_context;
+    GLFWbool        KHR_create_context_no_error;
 
     void*           handle;
 

src/glx_context.c

@@ -380,6 +380,8 @@ int _glfwCreateContext(_GLFWwindow* window,
 
         if (ctxconfig->debug)
             flags |= GLX_CONTEXT_DEBUG_BIT_ARB;
+        if (ctxconfig->noerror)
+            flags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
 
         if (ctxconfig->robustness)
         {

src/internal.h

@@ -65,6 +65,7 @@
 #define GL_NO_RESET_NOTIFICATION_ARB 0x8261
 #define GL_CONTEXT_RELEASE_BEHAVIOR 0x82fb
 #define GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH 0x82fc
+#define GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR 0x00000008
 
 typedef int	GLint;
 typedef unsigned int GLuint;
@@ -195,6 +196,7 @@ struct _GLFWctxconfig
     int           minor;
     GLFWbool      forward;
     GLFWbool      debug;
+    GLFWbool      noerror;
     int           profile;
     int           robustness;
     int           release;
@@ -262,7 +264,7 @@ struct _GLFWwindow
     struct {
         int             api;
         int             major, minor, revision;
-        GLFWbool        forward, debug;
+        GLFWbool        forward, debug, noerror;
         int             profile;
         int             robustness;
         int             release;

src/wgl_context.c

@@ -382,6 +382,8 @@ int _glfwCreateContext(_GLFWwindow* window,
 
         if (ctxconfig->debug)
             flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
+        if (ctxconfig->noerror)
+            flags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
 
         if (ctxconfig->robustness)
         {

src/window.c

@@ -357,6 +357,9 @@ GLFWAPI void glfwWindowHint(int target, int hint)
         case GLFW_OPENGL_DEBUG_CONTEXT:
             _glfw.hints.context.debug = hint ? GLFW_TRUE : GLFW_FALSE;
             break;
+        case GLFW_CONTEXT_NO_ERROR:
+            _glfw.hints.context.noerror = hint ? GLFW_TRUE : GLFW_FALSE;
+            break;
         case GLFW_OPENGL_PROFILE:
             _glfw.hints.context.profile = hint;
             break;
@@ -629,6 +632,8 @@ GLFWAPI int glfwGetWindowAttrib(GLFWwindow* handle, int attrib)
             return window->context.profile;
         case GLFW_CONTEXT_RELEASE_BEHAVIOR:
             return window->context.release;
+        case GLFW_CONTEXT_NO_ERROR:
+            return window->context.noerror;
     }
 
     _glfwInputError(GLFW_INVALID_ENUM, "Invalid window attribute");

tests/glfwinfo.c

@@ -88,6 +88,7 @@ static void usage(void)
     printf("      --stereo              request stereo rendering\n");
     printf("      --srgb                request an sRGB capable framebuffer\n");
     printf("      --singlebuffer        request single-buffering\n");
+    printf("      --no-error            request a context that does not emit errors\n");
 }
 
 static void error_callback(int error, const char* description)
@@ -226,7 +227,7 @@ int main(int argc, char** argv)
            MAJOR, MINOR, PROFILE, ROBUSTNESS, VERSION,
            REDBITS, GREENBITS, BLUEBITS, ALPHABITS, DEPTHBITS, STENCILBITS,
            ACCUMREDBITS, ACCUMGREENBITS, ACCUMBLUEBITS, ACCUMALPHABITS,
-           AUXBUFFERS, SAMPLES, STEREO, SRGB, SINGLEBUFFER };
+           AUXBUFFERS, SAMPLES, STEREO, SRGB, SINGLEBUFFER, NOERROR };
     const struct option options[] =
     {
         { "behavior",         1, NULL, BEHAVIOR },
@@ -255,6 +256,7 @@ int main(int argc, char** argv)
         { "stereo",           0, NULL, STEREO },
         { "srgb",             0, NULL, SRGB },
         { "singlebuffer",     0, NULL, SINGLEBUFFER },
+        { "no-error",         0, NULL, NOERROR },
         { NULL, 0, NULL, 0 }
     };
 
@@ -447,6 +449,9 @@ int main(int argc, char** argv)
             case SINGLEBUFFER:
                 glfwWindowHint(GLFW_DOUBLEBUFFER, GLFW_FALSE);
                 break;
+            case NOERROR:
+                glfwWindowHint(GLFW_CONTEXT_NO_ERROR, GLFW_TRUE);
+                break;
             default:
                 usage();
                 exit(EXIT_FAILURE);
@@ -500,6 +505,8 @@ int main(int argc, char** argv)
                 printf(" debug");
             if (flags & GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB)
                 printf(" robustness");
+            if (flags & 8/*GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR*/)
+                printf(" no-error");
             putchar('\n');
 
             printf("%s context flags parsed by GLFW:", get_api_name(api));
@@ -510,6 +517,8 @@ int main(int argc, char** argv)
                 printf(" debug");
             if (glfwGetWindowAttrib(window, GLFW_CONTEXT_ROBUSTNESS) == GLFW_LOSE_CONTEXT_ON_RESET)
                 printf(" robustness");
+            if (glfwGetWindowAttrib(window, GLFW_CONTEXT_NO_ERROR))
+                printf(" no-error");
             putchar('\n');
         }