1 files changed, 140 insertions, 0 deletions
diff --git a/Sources/Compositor/OwlIOSurfaceBuffer.m b/Sources/Compositor/OwlIOSurfaceBuffer.m
new file mode 100644
index 0000000..eb25021
--- /dev/null
+++ b/Sources/Compositor/OwlIOSurfaceBuffer.m
@@ -0,0 +1,140 @@
+/* This file is part of Owl.
+ *
+ * Copyright © 2019-2021 Sergey Bugaev <bugaevc@gmail.com>
+ *
+ * Owl is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published
+ * by the Free Software Foundation, either version 3 of the License,
+ * or (at your option) any later version.
+ *
+ * Owl is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Owl.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#import "OwlFeatures.h"
+#ifdef OWL_PLATFORM_APPLE
+
+#import "OwlIOSurfaceBuffer.h"
+#import <OpenGL/gl.h>
+#import <OpenGL/CGLIOSurface.h>
+
+
+@implementation OwlIOSurfaceBuffer
+
+- (id) initWithResource: (struct wl_resource *) resource
+            surfacePort: (mach_port_t) surfacePort
+{
+    self = [super initWithResource: resource];
+    _surface = IOSurfaceLookupFromMachPort(surfacePort);
+    return self;
+}
+
+- (void) dealloc {
+    IOSurfaceDecrementUseCount(_surface);
+    [super dealloc];
+}
+
+- (void) invalidate {
+    // ???
+}
+
+- (NSSize) size {
+    size_t width = IOSurfaceGetWidth(_surface);
+    size_t height = IOSurfaceGetHeight(_surface);
+    return NSMakeSize(width, height);
+}
+
+- (BOOL) needsGLForRendering {
+    return YES;
+}
+
+- (void) setupTextureWithCGLContext: (CGLContextObj) context {
+    glGenTextures(1, &_tex);
+    glBindTexture(GL_TEXTURE_RECTANGLE_ARB, _tex);
+
+    size_t width = IOSurfaceGetWidth(_surface);
+    size_t height = IOSurfaceGetHeight(_surface);
+
+    CGLTexImageIOSurface2D(
+        context,
+        GL_TEXTURE_RECTANGLE_ARB,  // target
+        GL_RGBA,  // internal_format
+        width,
+        height,
+        GL_BGRA,  // format
+        GL_UNSIGNED_INT_8_8_8_8_REV,  // type
+        _surface,
+        0  // plane
+    );
+
+    glTexParameteri(
+        GL_TEXTURE_RECTANGLE_ARB,
+        GL_TEXTURE_MIN_FILTER,
+        GL_LINEAR
+    );
+    glTexParameteri(
+        GL_TEXTURE_RECTANGLE_ARB,
+        GL_TEXTURE_MAG_FILTER,
+        GL_LINEAR
+    );
+    glTexParameteri(
+        GL_TEXTURE_RECTANGLE_ARB,
+        GL_TEXTURE_WRAP_S,
+        GL_CLAMP_TO_EDGE
+    );
+    glTexParameteri(
+        GL_TEXTURE_RECTANGLE_ARB,
+        GL_TEXTURE_WRAP_T,
+        GL_CLAMP_TO_EDGE
+    );
+}
+
+- (void) drawInRect: (NSRect) rect {
+    glViewport(0, 0, rect.size.width, rect.size.height);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(0, rect.size.width, 0, rect.size.height, -1, 1);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    struct {
+        GLfloat x, y;
+    } coord[4] = {
+        {0, 0},
+        {rect.size.width, 0},
+        {0, rect.size.height},
+        {rect.size.width, rect.size.height}
+    };
+
+    glEnable(GL_TEXTURE_RECTANGLE_ARB);
+
+    NSOpenGLContext *currentContext = [NSOpenGLContext currentContext];
+    [self setupTextureWithCGLContext: [currentContext CGLContextObj]];
+
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+
+    glPushMatrix();
+    glTexCoordPointer(2, GL_FLOAT, 0, coord);
+    glVertexPointer(2, GL_FLOAT, 0, coord);
+
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+    glPopMatrix();
+
+    glFlush();
+}
+
+- (void) notifyDetached {
+    [self sendRelease];
+}
+
+@end
+
+#endif /* OWL_PLATFORM_APPLE */