Initial work on Metal support.

Hello world sort of works with this, but not perfectly.  There are still clipping issues, and probably performance issues.
Only implements a few of the key executable ops - enough to get hello world working.

Author: shannah

Ports/iOSPort/nativeSources/CN1ES2compat.h

@@ -20,13 +20,56 @@
  * Please contact Codename One through http://www.codenameone.com/ if you
  * need additional information or have any questions.
  */
+//#define CN1_USE_METAL
+
+#ifndef CN1_USE_METAL
 #define USE_ES2 1
+#endif
+
 enum CN1GLenum {
     CN1_GL_ALPHA_TEXTURE,
     CN1_GL_VERTEX_COLORS
 };
 
-#ifdef USE_ES2
+#ifdef CN1_USE_METAL
+// Metal compatibility layer
+// These macros are no-ops for Metal since it uses a different rendering model
+// Transform operations are handled by CN1METALTransform instead
+#import "CN1METALTransform.h"
+
+#define _glMatrixMode(foo) ((void)0)
+#define _glLoadIdentity() CN1_Metal_LoadIdentity()
+#define _glOrthof(p1,p2,p3,p4,p5,p6) ((void)0)
+#define _glDisable(foo) ((void)0)
+#define _glEnable(foo) ((void)0)
+#define _glScalef(xScale,yScale,zScale) CN1_Metal_Scale(xScale,yScale,zScale)
+#define _glTranslatef(x,y,z) CN1_Metal_Translate(x,y,z)
+#define _glColor4f(r,g,b,a) ((void)0)
+#define _glEnableClientState(s) ((void)0)
+#define _glDisableClientState(s) ((void)0)
+#define _glTexCoordPointer(size,type,stride,pointer) ((void)0)
+#define _glVertexPointer(size,type,stride,pointer) ((void)0)
+#define _glDrawArrays(mode,first,count) ((void)0)
+#define _glRotatef(angle,x,y,z) CN1_Metal_Rotate(angle,x,y,z)
+#define _glEnableCN1State(state) ((void)0)
+#define _glDisableCN1State(state) ((void)0)
+#define _glAlphaMaskTexCoordPointer(size,type,stride,pointer) ((void)0)
+
+// Define GL constants as no-ops for Metal
+#define GL_TEXTURE_2D 0
+#define GL_BLEND 0
+#define GL_ONE_MINUS_SRC_ALPHA 0
+#define GL_SRC_ALPHA 0
+#define GL_MODELVIEW 0
+#define GL_PROJECTION 0
+#define GL_VERTEX_ARRAY 0
+#define GL_TEXTURE_COORD_ARRAY 0
+#define GL_TRIANGLES 0
+#define GL_TRIANGLE_FAN 0
+#define GL_TRIANGLE_STRIP 0
+#define GL_NO_ERROR 0
+
+#elif USE_ES2
 #import <GLKit/GLKit.h>
 #import <OpenGLES/ES2/gl.h>
 #import "ExecutableOp.h"

Ports/iOSPort/nativeSources/ClipRect.m

@@ -23,6 +23,9 @@
 #import "ClipRect.h"
 #import "CodenameOne_GLViewController.h"
 #import "FillRect.h"
+#ifdef CN1_USE_METAL
+#import <Metal/Metal.h>
+#endif
 #ifdef USE_ES2
 #import "DrawTextureAlphaMask.h"
 #import "FillPolygon.h"
@@ -92,7 +95,74 @@ -(void)executeWithLog {
 }
 
 -(void)execute {
-#ifdef USE_ES2
+#ifdef CN1_USE_METAL
+    // Metal implementation using scissor rectangle
+    // For polygon/texture clipping, we'd need stencil buffer - not implemented yet
+    if (texture != 0 || numPoints > 0) {
+        NSLog(@"ClipRect: Polygon/texture clipping not yet implemented in Metal");
+        return;
+    }
+
+    clipIsTexture = NO;
+    int x2 = x + width;
+    int y2 = y + height;
+    int orX = drawingRect.origin.x;
+    int orY = drawingRect.origin.y;
+    if(x < orX) {
+        x = orX;
+        width = x2 - x;
+    }
+    if(y < orY) {
+        y = orY;
+        height = y2 - y;
+    }
+    int destX2 = (int)(drawingRect.origin.x + drawingRect.size.width);
+    int destY2 = (int)(drawingRect.origin.y + drawingRect.size.height);
+    if(x2 > destX2) {
+        width = destX2 - x;
+    }
+    if(y2 > destY2) {
+        height = destY2 - y;
+    }
+
+    if(width > 0 && height > 0) {
+        [super clipBlock:NO];
+        int scale = scaleValue;
+        int displayHeight = [CodenameOne_GLViewController instance].view.bounds.size.height * scale;
+
+        // Check if this is full screen - if so, disable scissor
+        if(width == [CodenameOne_GLViewController instance].view.bounds.size.width * scale && height == displayHeight) {
+            MTLScissorRect fullScreenRect = {0, 0, 0, 0};
+            [[CodenameOne_GLViewController instance] setScissorRect:fullScreenRect enabled:NO];
+            return;
+        }
+
+        // Set scissor rectangle for Metal
+        clipX = x;
+        clipW = width;
+        if (clipX < 0) {
+            clipX = 0;
+            clipW = width;
+        }
+
+        clipY = y;
+        clipH = height;
+        if (clipY < 0) {
+            clipY = 0;
+            clipH = height;
+        }
+
+        [ClipRect updateClipToScale];
+
+        // Apply scissor to Metal encoder
+        MTLScissorRect scissor = {clipX, clipY, clipW, clipH};
+        [[CodenameOne_GLViewController instance] setScissorRect:scissor enabled:YES];
+
+        clipApplied = YES;
+    } else {
+        [super clipBlock:YES];
+    }
+#elif defined(USE_ES2)
     if ( texture != 0 || numPoints > 0 ){
         clipX = x; clipY=y; clipW=width; clipH=height;
         glClearStencil(0x0);
@@ -131,8 +201,9 @@ -(void)execute {
         return;
     }
 
-    
+
 #endif
+#ifndef CN1_USE_METAL
     clipIsTexture = NO;
     int x2 = x + width;
     int y2 = y + height;
@@ -210,6 +281,7 @@ -(void)execute {
 #endif
         clipApplied = NO;
     }
+#endif  // #ifndef CN1_USE_METAL
 
 }
 

Ports/iOSPort/nativeSources/CodenameOne_GLViewController.h

@@ -23,12 +23,17 @@
 #import "CN1ES2compat.h"
 #import <UIKit/UIKit.h>
 
+#ifdef CN1_USE_METAL
+#import "METALView.h"
+#else
 #import <OpenGLES/EAGL.h>
 #import "EAGLView.h"
 #import <OpenGLES/ES1/gl.h>
 #import <OpenGLES/ES1/glext.h>
 #import <OpenGLES/ES2/gl.h>
 #import <OpenGLES/ES2/glext.h>
+#endif
+
 #import "ExecutableOp.h"
 #import "PaintOp.h"
 #import "GLUIImage.h"
@@ -159,7 +164,11 @@
 #define CN1_CAP_ROUND 1
 #define CN1_CAP_SQUARE 2
 
+#ifdef CN1_USE_METAL
+#define METALVIEW [[CodenameOne_GLViewController instance] metalView]
+#else
 #define EAGLVIEW [[CodenameOne_GLViewController instance] eaglView]
+#endif
 
 //ADD_INCLUDE
 
@@ -191,8 +200,10 @@ MFMessageComposeViewControllerDelegate, CLLocationManagerDelegate, AVAudioRecord
 #endif
 > {
 @private
+#ifndef CN1_USE_METAL
     EAGLContext *context;
     GLuint program;
+#endif
 
     BOOL animating;
     NSInteger animationFrameInterval;
@@ -227,7 +238,13 @@ MFMessageComposeViewControllerDelegate, CLLocationManagerDelegate, AVAudioRecord
 - (void)signIn:(GIDSignIn *)signIn didDisconnectWithUser:(GIDGoogleUser *)user withError:(NSError *)error;
 #endif
 
+#ifdef CN1_USE_METAL
+-(METALView*)metalView;
+-(void)setScissorRect:(MTLScissorRect)rect enabled:(BOOL)enabled;
+#else
 -(EAGLView*)eaglView;
+#endif
+
 -(void)startAnimation;
 -(void)stopAnimation;
 +(BOOL)isDrawTextureSupported;