mac opengl support. proper coordinate flipping

src/widget/opengl_cocoa.m

@@ -0,0 +1,128 @@
+#include "Mw/Core.h"
+#include "Mw/StringDefs.h"
+#include <Mw/Milsko.h>
+#include <Mw/Widget/OpenGL.h>
+#import <mach-o/dyld.h>
+
+@interface MacOpenGLWidget : NSObject {
+  NSOpenGLPixelFormat *pixelFormat;
+  NSOpenGLContext *glc;
+}
+
+- (MacOpenGLWidget *)initWithView:(NSView *)view;
+- (void)destroy;
+- (void)makeCurrent;
+- (void)swapBuffer;
+- (void *)getProcAddressWithName:(const char *)name;
+
+@end
+
+static int create(MwWidget handle) {
+  void *r = NULL;
+  MwWidget w = handle;
+
+  int x = MwGetInteger(w, MwNx);
+  int y = MwGetInteger(w, MwNy);
+  int width = MwGetInteger(w, MwNwidth);
+  int height = MwGetInteger(w, MwNheight);
+
+  printf("%d %d\n", width, height);
+
+  MacOpenGLWidget *o = r = [[MacOpenGLWidget alloc]
+      initWithView:[handle->lowlevel->cocoa.real getView]];
+
+  handle->internal = r;
+  handle->lowlevel->common.copy_buffer = 0;
+
+  MwSetDefault(handle);
+
+  while (w->parent != NULL)
+    w = w->parent;
+
+  w->berserk++;
+
+  return 0;
+}
+
+static void destroy(MwWidget handle) {
+  [(MacOpenGLWidget *)handle->internal destroy];
+}
+
+static void mwOpenGLMakeCurrentImpl(MwWidget handle) {
+  [(MacOpenGLWidget *)handle->internal makeCurrent];
+}
+
+static void mwOpenGLSwapBufferImpl(MwWidget handle) {
+  [(MacOpenGLWidget *)handle->internal swapBuffer];
+}
+
+static void *mwOpenGLGetProcAddressImpl(MwWidget handle, const char *name) {
+  return [(MacOpenGLWidget *)handle->internal getProcAddressWithName:name];
+}
+
+static void func_handler(MwWidget handle, const char *name, void *out,
+                         va_list va) {
+  if (strcmp(name, "mwOpenGLMakeCurrent") == 0) {
+    mwOpenGLMakeCurrentImpl(handle);
+  }
+  if (strcmp(name, "mwOpenGLSwapBuffer") == 0) {
+    mwOpenGLSwapBufferImpl(handle);
+  }
+  if (strcmp(name, "mwOpenGLGetProcAddress") == 0) {
+    const char *_name = va_arg(va, const char *);
+    *(void **)out = mwOpenGLGetProcAddressImpl(handle, _name);
+  }
+}
+
+@implementation MacOpenGLWidget
+
+- (MacOpenGLWidget *)initWithView:(NSView *)view {
+  NSOpenGLPixelFormatAttribute pixelFormatAttributes[] = {
+      NSOpenGLPFAColorSize,    24,
+      NSOpenGLPFAStencilSize,  8,
+      NSOpenGLPFAAlphaSize,    8,
+      NSOpenGLPFADoubleBuffer, NSOpenGLPFAAccelerated,
+      NSOpenGLPFANoRecovery,   0};
+  self->pixelFormat =
+      [[NSOpenGLPixelFormat alloc] initWithAttributes:pixelFormatAttributes];
+  self->glc =
+      [[NSOpenGLContext alloc] initWithFormat:pixelFormat shareContext:nil];
+  [self->glc setView:view];
+  return self;
+};
+- (void)destroy {
+};
+- (void)makeCurrent {
+  [self->glc makeCurrentContext];
+};
+- (void)swapBuffer {
+  [self->glc flushBuffer];
+};
+- (void *)getProcAddressWithName:(const char *)name {
+  if (NSIsSymbolNameDefined(name)) {
+    return NSAddressOfSymbol(NSLookupAndBindSymbol(name));
+  } else {
+    return NULL;
+  }
+};
+
+@end
+
+MwClassRec MwOpenGLClassRec = {create,       /* create */
+                               destroy,      /* destroy */
+                               NULL,         /* draw */
+                               NULL,         /* click */
+                               NULL,         /* parent_resize */
+                               NULL,         /* prop_change */
+                               NULL,         /* mouse_move */
+                               NULL,         /* mouse_up */
+                               NULL,         /* mouse_down */
+                               NULL,         /* key */
+                               func_handler, /* execute */
+                               NULL,         /* tick */
+                               NULL,         /* resize */
+                               NULL,         /* children_update */
+                               NULL,         /* children_prop_change */
+                               NULL,         /* clipboard */
+                               NULL,         NULL, NULL, NULL};
+MwClass MwOpenGLClass = &MwOpenGLClassRec;