VuoGraphicsLayer.m

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#import "VuoGraphicsLayer.h"
 
#import "VuoApp.h"
#import "VuoCompositionState.h"
#import "VuoCglPixelFormat.h"
#import "VuoEventLoop.h"
#import "VuoGraphicsView.h"
 
#import <OpenGL/gl.h>
#define glGenVertexArrays glGenVertexArraysAPPLE
#define glBindVertexArray glBindVertexArrayAPPLE
#define glDeleteVertexArrays glDeleteVertexArraysAPPLE
 
#import <IOSurface/IOSurface.h>
 
#ifdef VUO_COMPILER
VuoModuleMetadata({
    "title" : "VuoGraphicsLayer",
    "dependencies" : [
        "VuoCglPixelFormat",
        "VuoDisplayRefresh",
        "VuoGraphicsView",
        "OpenGL.framework",
        "QuartzCore.framework",
    ]
});
#endif
 
static GLuint CompileShader(GLenum type, const char *source)
{
    GLint length = (GLint)strlen(source);
    GLuint shader = glCreateShader(type);
    glShaderSource(shader, 1, (const GLchar**)&source, &length);
    glCompileShader(shader);
 
    int infologLength = 0;
    glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infologLength);
    if (infologLength > 0)
    {
        char *infoLog = (char *)malloc(infologLength);
        int charsWritten = 0;
        glGetShaderInfoLog(shader, infologLength, &charsWritten, infoLog);
        VUserLog("%s", infoLog);
        free(infoLog);
    }
    return shader;
}
 
@interface VuoGraphicsLayer ()
@property VuoGraphicsWindowInitCallback          initCallback;
@property VuoGraphicsWindowUpdateBackingCallback updateBackingCallback;
@property VuoGraphicsWindowResizeCallback        resizeCallback;
@property VuoGraphicsWindowDrawCallback          drawCallback;
@property void *userData;
 
@property dispatch_queue_t drawQueue;         
 
@property double renderScheduled;                      
 
@property VuoDisplayRefresh displayRefresh;   
 
@property GLuint receiveTextureUniform;                
@property GLuint receiveTextureOffsetUniform;          
 
@property bool firstFrame;              
@property bool closed;                  
 
@property uint64_t framesRenderedSinceProfileLogged; 
@property double lastProfileLoggedTime; 
@end
 
static void VuoGraphicsLayer_drawOnIOSurface(VuoGraphicsLayer *l);
 
static void VuoGraphicsLayer_drawOnIOSurface(VuoGraphicsLayer *l)
{
    if (l.ioSurface)
    {
        VuoIoSurfacePool_signal(VuoIoSurfacePool_getIOSurfaceRef(l.ioSurface));
        VuoIoSurfacePool_disuse(l.ioSurface, false);  // Guaranteed to have finished blitting to the window by this point, so no need to quarantine.
        l.ioSurface = NULL;
    }
 
    void *callerData = l.userData;
    VuoGraphicsWindow *gw = l.window;
    VuoGraphicsView *gv = (VuoGraphicsView *)gw.contentView;
 
    NSRect frame = l.frame;
    frame.origin.x *= gw.backingScaleFactor;
    frame.origin.y *= gw.backingScaleFactor;
    frame.size.width *= gw.backingScaleFactor;
    frame.size.height *= gw.backingScaleFactor;
 
    {
        // Dimensions, in pixels (not points).
        int x = 0;
        int y = 0;
        int width = frame.size.width;
        int height = frame.size.height;
 
        // When fullscreen and aspect-locked, letterbox the scene (render to a centered rectangle that fits the size of the screen and matches the aspect of the now-hidden window).
        NSSize desiredAspectSize = gw.contentAspectRatio;
        bool isAspectLocked = !NSEqualSizes(desiredAspectSize, NSMakeSize(0,0));
        if (gw.isFullScreen && isAspectLocked)
        {
            float desiredAspect = desiredAspectSize.width / desiredAspectSize.height;
            float screenAspect = frame.size.width / frame.size.height;
 
            if (desiredAspect > screenAspect)
            {
                // Match the screen's width.
                width = frame.size.width;
                height = frame.size.width / desiredAspect;
                x = 0;
                y = frame.size.height/2 - height/2;
            }
            else
            {
                // Match the screen's height.
                width = frame.size.height * desiredAspect;
                height = frame.size.height;
                x = frame.size.width/2 - width/2;
                y = 0;
            }
        }
 
        // When fullscreen and non-resizable, windowbox the scene (render to a centered rectangle matching the size of the now-hidden window).
        bool isWindowResizable = (gw.isFullScreen ? gw.styleMaskWhenWindowed : gw.styleMask) & NSResizableWindowMask;
        if (gw.isFullScreen && !isWindowResizable)
        {
            NSRect contentRectWhenWindowed = [gv convertRectToBacking:gw.contentRectWhenWindowed];
            width = contentRectWhenWindowed.size.width;
            height = contentRectWhenWindowed.size.height;
            x = frame.size.width/2 - width/2;
            y = frame.size.height/2 - height/2;
        }
 
 
        bool backingScaleFactorChanged = (gw.backingScaleFactorCached != gw.backingScaleFactor);
        NSRect newViewport = NSMakeRect(x, y, width, height);
        if (!NSEqualRects(gv.viewport, newViewport) || l.firstFrame || backingScaleFactorChanged)
        {
            // When moving a window between Retina and non-Retina displays,
            // viewDidChangeBackingProperties might be invoked either before or after the next
            // VuoGraphicsLayer_drawOnIOSurface execution.  Ensure that, if the backing has changed,
            // we call backingChangedCallback, then resizeCallback, then drawCallback
            // (since backingChangedCallback creates a new VuoSceneRenderer, without a size).
            // https://b33p.net/kosada/node/12273
            if (backingScaleFactorChanged)
                [l viewDidChangeBackingProperties];
 
            l.resizeCallback(callerData, width, height);
            gv.viewport = newViewport;
            l.firstFrame = NO;
        }
    }
 
 
    // Draw onto the IOSurface FBO.
    VuoIoSurface vis = l.drawCallback(callerData);
    if (!vis)
        return;
 
    [gw.recorder saveImage:vis];
 
    l.ioSurface = vis;
}
 
@implementation VuoGraphicsLayer
 
- (instancetype)initWithWindow:(VuoGraphicsWindow *)window
                        initCallback:(VuoGraphicsWindowInitCallback)initCallback
               updateBackingCallback:(VuoGraphicsWindowUpdateBackingCallback)updateBackingCallback
                  backingScaleFactor:(float)backingScaleFactor
                      resizeCallback:(VuoGraphicsWindowResizeCallback)resizeCallback
                        drawCallback:(VuoGraphicsWindowDrawCallback)drawCallback
                            userData:(void *)userData
{
    if (self = [super init])
    {
        _window = window;
        _initCallback = initCallback;
        _updateBackingCallback = updateBackingCallback;
        _resizeCallback = resizeCallback;
        _drawCallback = drawCallback;
        _userData = userData;
 
        if ([self respondsToSelector:@selector(setColorspace:)])
            [self performSelector:@selector(setColorspace:) withObject:(id)CGColorSpaceCreateWithName(kCGColorSpaceSRGB)];
 
        self.needsDisplayOnBoundsChange = YES;
 
        _drawQueue = dispatch_queue_create("org.vuo.VuoGraphicsLayer", VuoEventLoop_getDispatchInteractiveAttribute());
 
        _renderScheduled = VuoLogGetElapsedTime();
 
        _firstFrame = YES;
 
        _initCallback(_userData, backingScaleFactor);
 
        _displayRefresh = VuoDisplayRefresh_make(self);
        VuoRetain(_displayRefresh);
 
        _lastProfileLoggedTime = VuoLogGetTime();
    }
    return self;
}
 
- (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask
{
    return VuoGlContext_makePlatformPixelFormat(false, false, -1);
}
 
- (CGLContextObj)copyCGLContextForPixelFormat:(CGLPixelFormatObj)pixelFormat
{
    CGLContextObj context = [super copyCGLContextForPixelFormat:pixelFormat];
 
    // Initialize stuff for rendering the IOSurface to the window.
    {
        CGLSetCurrentContext(context);
 
        GLuint vertexArray;
        glGenVertexArrays(1, &vertexArray);
        glBindVertexArray(vertexArray);
 
        const GLfloat trianglePositions[] = {
            -1, -1,
             3, -1,
            -1,  3,
        };
        GLuint trianglePositionBuffer;
        glGenBuffers(1, &trianglePositionBuffer);
        glBindBuffer(GL_ARRAY_BUFFER, trianglePositionBuffer);
        glBufferData(GL_ARRAY_BUFFER, sizeof(trianglePositions), trianglePositions, GL_STATIC_DRAW);
        VuoGlPool_logVRAMAllocated(sizeof(trianglePositions));
 
        const char *vertexShaderSource = VUOSHADER_GLSL_SOURCE(120,
            attribute vec2 position;
            void main()
            {
                gl_Position = vec4(position.x, position.y, 0., 1.);
            }
        );
        const char *fragmentShaderSource = VUOSHADER_GLSL_SOURCE(120,
            uniform sampler2DRect t;
            uniform vec2 textureOrigin;
            void main()
            {
                gl_FragColor = texture2DRect(t, gl_FragCoord.xy - textureOrigin);
            }
        );
        GLuint   vertexShader = CompileShader(GL_VERTEX_SHADER,     vertexShaderSource);
        GLuint fragmentShader = CompileShader(GL_FRAGMENT_SHADER, fragmentShaderSource);
        GLuint program = glCreateProgram();
        glAttachShader(program, vertexShader);
        glAttachShader(program, fragmentShader);
        glLinkProgram(program);
 
        GLuint positionAttribute = glGetAttribLocation(program, "position");
 
        _receiveTextureUniform = glGetUniformLocation(program, "t");
        _receiveTextureOffsetUniform = glGetUniformLocation(program, "textureOrigin");
        glUseProgram(program);
        glVertexAttribPointer(positionAttribute, 2, GL_FLOAT, GL_FALSE, sizeof(GLfloat)*2, (void*)0);
        glEnableVertexAttribArray(positionAttribute);
 
        CGLSetCurrentContext(NULL);
    }
 
    return context;
}
 
- (void)viewDidChangeBackingProperties
{
    float backingScaleFactor = _window.backingScaleFactor;
    if (backingScaleFactor != _window.backingScaleFactorCached)
    {
        VDebugLog("backingScaleFactor changed from %g to %g", _window.backingScaleFactorCached, backingScaleFactor);
        // Get the window's current size in pixels.
        NSRect contentRect = [_window contentRectForFrameRect:_window.frame];
        NSSize oldContentRectPixelSize = NSMakeSize(contentRect.size.width  * _window.backingScaleFactorCached,
                                                    contentRect.size.height * _window.backingScaleFactorCached);
 
        _window.backingScaleFactorCached = backingScaleFactor;
        self.contentsScale = backingScaleFactor;
 
        _updateBackingCallback(_userData, backingScaleFactor);
 
        if (_window.maintainsPixelSizeWhenBackingChanges)
        {
            // Resize the window to maintain its pixel size.
 
            NSSize newContentRectPointSize = NSMakeSize(oldContentRectPixelSize.width  / _window.backingScaleFactorCached,
                                                        oldContentRectPixelSize.height / _window.backingScaleFactorCached);
 
            NSRect contentRect = [_window contentRectForFrameRect:_window.frame];
 
            // Adjust the y position by the change in height, so that the window appears to be anchored in its top-left corner
            // (instead of its bottom-left corner as the system does by default).
            contentRect.origin.y += contentRect.size.height - newContentRectPointSize.height;
 
            contentRect.size = newContentRectPointSize;
            [_window setFrame:[_window frameRectForContentRect:contentRect] display:YES animate:NO];
        }
    }
}
 
- (void)enableTriggers
{
    VuoGraphicsWindow *gw = self.window;
    VuoDisplayRefresh_enableTriggers(_displayRefresh, gw.requestedFrame, NULL);
}
 
- (void)disableTriggers
{
    VuoDisplayRefresh_disableTriggers(_displayRefresh);
}
 
- (void)setBounds:(CGRect)bounds
{
    [super setBounds:bounds];
}
 
- (void)draw
{
    double now = VuoLogGetElapsedTime();
    if (now - _renderScheduled > 0.4)
    {
        _renderScheduled = now;
        dispatch_async(dispatch_get_main_queue(), ^{
            [self setNeedsDisplay];
        });
    }
}
 
- (void)drawInCGLContext:(CGLContextObj)context pixelFormat:(CGLPixelFormatObj)pixelFormat forLayerTime:(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp
{
    _renderScheduled = -INFINITY;
 
    if (_closed)
        return;
 
    dispatch_sync(_drawQueue, ^{
        VuoGraphicsLayer_drawOnIOSurface(self);
        if (!_ioSurface)
            return;
 
        NSRect frameInPoints = self.frame;
        double s = _window.backingScaleFactor;
        NSRect frameInPixels = NSMakeRect(frameInPoints.origin.x * s, frameInPoints.origin.y * s, frameInPoints.size.width * s, frameInPoints.size.height * s);
        size_t ioSurfaceWidth  = VuoIoSurfacePool_getWidth(_ioSurface);
        size_t ioSurfaceHeight = VuoIoSurfacePool_getHeight(_ioSurface);
 
        VuoGraphicsView *gv = (VuoGraphicsView *)_window.contentView;
        NSRect viewport = gv.viewport;
 
        // Prepare a texture to receive the IOSurface onto the local OpenGL context.
        GLuint receiveTexture;
        GLuint receiveTextureBytes;
        {
            glGenTextures(1, &receiveTexture);  // This can't participate in the VuoGlTexturePool since it's not on Vuo's shared context.
            glActiveTexture(GL_TEXTURE0);
            glBindTexture(GL_TEXTURE_RECTANGLE_EXT, receiveTexture);
            glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
            glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
            glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
//          glTexParameteri(GL_TEXTURE_RECTANGLE_EXT, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
            glUniform1i(_receiveTextureUniform, 0);
 
            CGLError err = CGLTexImageIOSurface2D(context, GL_TEXTURE_RECTANGLE_EXT, GL_RGB, ioSurfaceWidth, ioSurfaceHeight, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, VuoIoSurfacePool_getIOSurfaceRef(_ioSurface), 0);
            if(err != kCGLNoError)
            {
                VUserLog("Error in CGLTexImageIOSurface2D() 2: %s", CGLErrorString(err));
                return;
            }
 
            receiveTextureBytes = ioSurfaceWidth * ioSurfaceHeight * 4;
            VuoGlPool_logVRAMAllocated(receiveTextureBytes);
 
            glUniform2f(_receiveTextureOffsetUniform, viewport.origin.x, viewport.origin.y);
            glViewport(viewport.origin.x, viewport.origin.y, viewport.size.width, viewport.size.height);
        }
 
 
        // Draw the active IOSurface onto the window, using the local OpenGL context.
        {
            if (!NSEqualRects(viewport, frameInPixels))
            {
                // Clear the parts of the view that we aren't rendering over.
                glClearColor(0,0,0,1);
                glClear(GL_COLOR_BUFFER_BIT);
            }
 
            glBindTexture(GL_TEXTURE_RECTANGLE_EXT, receiveTexture);
            glDrawArrays(GL_TRIANGLES, 0, 3);
 
            glBindTexture(GL_TEXTURE_RECTANGLE_EXT, 0);
            glDeleteTextures(1, &receiveTexture);
            VuoGlPool_logVRAMFreed(receiveTextureBytes);
 
            glFlush();
        }
    });
 
    if (VuoIsDebugEnabled())
    {
        ++_framesRenderedSinceProfileLogged;
        double t = VuoLogGetTime();
        const double profileSeconds = 10;
        if (t > _lastProfileLoggedTime + profileSeconds)
        {
            VDebugLog("%4.1f fps", _framesRenderedSinceProfileLogged / profileSeconds);
            _lastProfileLoggedTime = t;
            _framesRenderedSinceProfileLogged = 0;
        }
    }
}
 
 
- (void)close
{
    _closed = YES;
    VuoRelease(_displayRefresh);
}
 
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wobjc-missing-super-calls"
 
- (void)dealloc
{
    // Dynamically changing the layer's contentsScale causes dealloc to be called
    // even though the layer has a nonzero retain count (!),
    // so we can't do anything here.
 
//  dispatch_release(_drawQueue);
//  if (_ioSurface)
//      VuoIoSurfacePool_disuse(_ioSurface);
//  [super dealloc];
}
#pragma clang diagnostic pop
 
@end