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ServerOpenGLView.m

/*

    File: ServerOpenGLView.m

Abstract:

This class implements the server specific subclass of NSOpenGLView.

It handles the server side rendering, which calls into the GLUT-based

Atlantis rendering code to draw into an IOSurface using an FBO.  It

also performs local rendering of each frame for display purposes.

It also shows how to bind IOSurface objects to OpenGL textures, and

how to use those for rendering with FBOs.

 Version: 1.2

Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

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terms, and your use, installation, modification or redistribution of

this Apple software constitutes acceptance of these terms.  If you do

not agree with these terms, please do not use, install, modify or

redistribute this Apple software.

In consideration of your agreement to abide by the following terms, and

subject to these terms, Apple grants you a personal, non-exclusive

license, under Apple's copyrights in this original Apple software (the

"Apple Software"), to use, reproduce, modify and redistribute the Apple

Software, with or without modifications, in source and/or binary forms;

provided that if you redistribute the Apple Software in its entirety and

without modifications, you must retain this notice and the following

text and disclaimers in all such redistributions of the Apple Software.

Neither the name, trademarks, service marks or logos of Apple Inc. may

be used to endorse or promote products derived from the Apple Software

without specific prior written permission from Apple.  Except as

expressly stated in this notice, no other rights or licenses, express or

implied, are granted by Apple herein, including but not limited to any

patent rights that may be infringed by your derivative works or by other

works in which the Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

Copyright (C) 2014 Apple Inc. All Rights Reserved.

*/

#import "ServerOpenGLView.h"

#import "ServerController.h"

#import "BoingRenderer.h"

#import <OpenGL/OpenGL.h>

#import <OpenGL/gl3.h>

#import <OpenGL/CGLIOSurface.h>

#import <GLKit/GLKit.h>

programInfo_t program[NUM_PROGRAMS] = {

    { "lighting.vsh",   "color.fsh"         },  // PROGRAM_LIGHTING

    { "color.vsh",      "color.fsh"         },  // PROGRAM_PASSTHRU

    { "texture.vsh",    "textureRect.fsh"   },  // PROGRAM_TEXTURE_RECT

};

@interface ServerOpenGLView()

    GLuint quadVAOId, quadVBOId;

    BOOL quadInit;

    GLuint depthBufferName;

    BoingRenderer *renderer;

@end

@implementation ServerOpenGLView

- (instancetype)initWithFrame:(NSRect)frame

    NSOpenGLPixelFormat *pix_fmt;

    NSOpenGLPixelFormatAttribute attribs[] =

        NSOpenGLPFAAllowOfflineRenderers,

        NSOpenGLPFAAccelerated,

        NSOpenGLPFADoubleBuffer,

        NSOpenGLPFAColorSize, 32,

        NSOpenGLPFADepthSize, 24,

        NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core, // Core Profile is the future

};

    pix_fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes:attribs];

    if(!pix_fmt)

        NSLog(@"couldn't create pixel format\n");

        [NSApp terminate:nil];

    self = [super initWithFrame:frame pixelFormat:pix_fmt];

    [pix_fmt release];

    [[self openGLContext] makeCurrentContext];

    return self;

- (void)prepareOpenGL

    [super prepareOpenGL];

    glGenVertexArrays(1, &quadVAOId);

    glGenBuffers(1, &quadVBOId);

    glBindVertexArray(quadVAOId);

    [self setupShaders];

    // Create a BoingRenderer object which handles the rendering of a Boing ball.

    renderer = [[BoingRenderer alloc] init];

    [renderer initShaders:program];

    glBindVertexArray(0);

- (void)update

    // Override to do nothing.

- (NSArray *)rendererNames

    NSMutableArray *rendererNames;

    GLint i, numScreens;

    rendererNames = [[NSMutableArray alloc] init];

    numScreens = [[self pixelFormat] numberOfVirtualScreens];

    for(i = 0; i < numScreens; i++)

        [[self openGLContext] setCurrentVirtualScreen:i];

        [rendererNames addObject:@((const char *)glGetString(GL_RENDERER))];

    return [rendererNames autorelease];

- (void)setRendererIndex:(uint32_t)index

    [[self openGLContext] setCurrentVirtualScreen:index];

// Create an IOSurface backed texture

// Create an FBO using the name of this texture and bind the texture to the color attachment of the FBO

- (GLuint)setupIOSurfaceTexture:(IOSurfaceRef)ioSurfaceBuffer fboName:(GLuint *)fboName

    GLuint name, namef;

    CGLContextObj cgl_ctx = (CGLContextObj)[[self openGLContext] CGLContextObj];

    glGenTextures(1, &name);

    glBindTexture(GL_TEXTURE_RECTANGLE, name);

    // At the moment, CGLTexImageIOSurface2D requires the GL_TEXTURE_RECTANGLE target

    CGLTexImageIOSurface2D(cgl_ctx, GL_TEXTURE_RECTANGLE, GL_RGBA, 512, 512, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,

                    ioSurfaceBuffer, 0);

    glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

    glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    // Generate an FBO and bind the texture to it as a render target.

    glBindTexture(GL_TEXTURE_RECTANGLE, 0);

    glGenFramebuffers(1, &namef);

    glBindFramebuffer(GL_FRAMEBUFFER, namef);

    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_RECTANGLE, name, 0);

    if(!depthBufferName)

        glGenRenderbuffers(1, &depthBufferName);

        glRenderbufferStorage(GL_TEXTURE_RECTANGLE, GL_DEPTH, 512, 512);

    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_RECTANGLE, depthBufferName);

    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    *fboName = namef;

    return name;

// Render to the current IOSurface via the corresponding FBO previously setuped in -setupIOSurfaceTexture:fboName

- (void)renderToCurrentIOSurface

    glBindFramebuffer(GL_FRAMEBUFFER, [(ServerController *)[NSApp delegate] currentFBOName]);

    glClearColor(0.675f, 0.675f, 0.675f, 1.0f);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glViewport(0,0,512,512);

    // Delegate to the BoingRenderer object to setup an appropriate projection matrix

    [renderer makeOrthographicForWidth:512 height:512];

    // Let the BoingRenderer object update the physics stuff

    [renderer update];

    // Delegate to the BoingRenderer object for drawing the boling ball

    [renderer render:program];

    // Bind back to system drawable.

    glBindFramebuffer(GL_FRAMEBUFFER, 0);

    glFlush();

// Fill the view with the IOSurface backed texture

- (void)renderTextureFromCurrentIOSurface

    NSRect bounds = [self bounds];

    GLfloat width = self.bounds.size.width;

    GLfloat height = self.bounds.size.height;

    GLfloat quad[] = {

        //x, y           s, t

        0.0f, 0.0f,      0.0f, 0.0f,

        width, 0.0f,     512.0f, 0.0f,

        0.0f, height,    0.0f, 512.0f,

        width, height,   512.0f, 512.0f,

};

    if (!quadInit) {

        glBindVertexArray(quadVAOId);

        glBindBuffer(GL_ARRAY_BUFFER, quadVBOId);

        glBufferData(GL_ARRAY_BUFFER, sizeof(quad), quad, GL_STATIC_DRAW);

        // positions

        glVertexAttribPointer(ATTRIB_VERTEX, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), NULL);

        // texture coordinates

        glVertexAttribPointer(ATTRIB_TEXCOORD, 2, GL_FLOAT, GL_FALSE, 4*sizeof(GLfloat), (const GLvoid*)(2*sizeof(GLfloat)));

        quadInit = YES;

    glViewport(0, 0, (GLint)bounds.size.width, (GLint)bounds.size.height);

    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

    glClear(GL_COLOR_BUFFER_BIT);

    glUseProgram(program[PROGRAM_TEXTURE_RECT].id);

    GLKMatrix4 projection = GLKMatrix4MakeOrtho(0.0, (GLfloat)bounds.size.width, 0.0f, (GLfloat)bounds.size.height, -1.0f, 1.0f);

    GLKMatrix4 modelView = GLKMatrix4Identity;

    GLKMatrix4 mvp = GLKMatrix4Multiply(projection, modelView);

    glUniformMatrix4fv(program[PROGRAM_TEXTURE_RECT].uniform[UNIFORM_MVP], 1, GL_FALSE, mvp.m);

    glUniform1i(program[PROGRAM_TEXTURE_RECT].uniform[UNIFORM_TEXTURE], 0);

    // Render quad from our iosurface texture

    glBindTexture(GL_TEXTURE_RECTANGLE, [(ServerController *)[NSApp delegate] currentTextureName]);

    glEnable(GL_TEXTURE_RECTANGLE);

    glBindVertexArray(quadVAOId);

    glEnableVertexAttribArray(ATTRIB_VERTEX);

    glEnableVertexAttribArray(ATTRIB_TEXCOORD);

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

    glDisableVertexAttribArray(ATTRIB_VERTEX);

    glDisableVertexAttribArray(ATTRIB_TEXCOORD);

    glDisable(GL_TEXTURE_RECTANGLE);

- (BOOL)isOpaque

    return YES;

- (void)drawRect:(NSRect)theRect

    // Only the Master app renders to the IOSurface

    [self renderToCurrentIOSurface];

    // Render a view size quad with the IOSurface backed texture

    glDisable(GL_DEPTH_TEST);

    [self renderTextureFromCurrentIOSurface];

    [[self openGLContext] flushBuffer];

    // This flush is necessary to ensure proper behavior if the MT engine is enabled.

    glFlush();

- (void)setupShaders

    for (int i = 0; i < NUM_PROGRAMS; i++)

        char *vsrc = readFile(pathForResource(program[i].vert));

        char *fsrc = readFile(pathForResource(program[i].frag));

        GLsizei attribCt = 0;

        GLchar *attribUsed[NUM_ATTRIBS];

        GLint attrib[NUM_ATTRIBS];

        GLchar *attribName[NUM_ATTRIBS] = {

            "inVertex", "inColor", "inNormal", "inTexCoord",

};

        const GLchar *uniformName[NUM_UNIFORMS] = {

            "MVP", "ModelView", "ModelViewIT", "lightDir", "ambient", "diffuse", "specular", "shininess", "constantColor", "tex",

};

        // auto-assign known attribs

        for (int j = 0; j < NUM_ATTRIBS; j++)

            if (strstr(vsrc, attribName[j]))

                attrib[attribCt] = j;

                attribUsed[attribCt++] = attribName[j];

        glueCreateProgram(vsrc, fsrc,

                          attribCt, (const GLchar **)&attribUsed[0], attrib,

                          NUM_UNIFORMS, &uniformName[0], program[i].uniform,

                          &program[i].id);

        free(vsrc);

        free(fsrc);

@end

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