Classes/VolumeOpenGLView.m

/*
 *  VolumeOpenGLView.m
 *
 *  Created by Michael Larson on Tue Mar 11 2003.
 *  Copyright (c) 2003 Apple Computer. All rights reserved.
 *
 
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 *
 */
 
#import "VolumeOpenGLView.h"
 
@implementation VolumeOpenGLView
// This loads the default values for this object
- (void) awakeFromNib
{
    m_glContextInited       = false;
    m_updateDisplay     = 0;
    m_frameNumber       = 0;
    m_vertexProgramString   = NULL;
}
 
// This overrides the pixel depth
- (id) initWithFrame: (NSRect) frame
{
    GLuint attribs[] = 
    {
        NSOpenGLPFANoRecovery,
        NSOpenGLPFAWindow,
        NSOpenGLPFAAccelerated,
        NSOpenGLPFADoubleBuffer,
        NSOpenGLPFAColorSize, 24,
        NSOpenGLPFAAlphaSize, 8,
        0
    };
    
    NSOpenGLPixelFormat* fmt = [[NSOpenGLPixelFormat alloc] initWithAttributes: (NSOpenGLPixelFormatAttribute*) attribs]; 
    
    if (!fmt)
    {
        NSLog(@"No OpenGL pixel format");
    }
    
    return self = [super initWithFrame:frame pixelFormat: [fmt autorelease]];
}
 
// Init GL for this context
- (void) initGL
{
    NSRect  rect = [self frame];
    
    // grab the gl context
    [[self openGLContext] makeCurrentContext];
    
    // Set the viewport
    glViewport(0, 0, (GLsizei) rect.size.width, (GLsizei) rect.size.height);
    glClearColor(0, 0, 0, 0);
    glClear(GL_COLOR_BUFFER_BIT);
 
    // Setup camera
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D (0, 1.0, 0, 1.0);
 
    // Enter modeling mode
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}
 
// Object rectangle initializer
- (void) drawRect: (NSRect) rect
{
    if (false == m_glContextInited)
    {
        [self initGL];
        
        m_glContextInited = true;
    }
 
    if (1 == m_updateDisplay)
    {
        [[self openGLContext] makeCurrentContext];
 
        [[self openGLContext] flushBuffer];
        
        m_updateDisplay = 0;
    }
}
 
// Matrix control
- (void) identity
{
    glLoadIdentity();
}
 
- (void) projection
{
    glMatrixMode(GL_PROJECTION);
}
 
- (void) modelview
{
    glMatrixMode(GL_MODELVIEW);
}
 
- (void) rotate_X: (GLfloat) x Y: (GLfloat) y Z: (GLfloat) z
{
    if (x)  glRotatef(x, 1, 0, 0);
    if (y)  glRotatef(y, 0, 1, 0);
    if (z)  glRotatef(z, 0, 0, 1);
}
 
- (void) scale_X: (GLfloat) x Y: (GLfloat) y Z: (GLfloat) z
{
    glScalef(x, y, z);
}
 
- (void) translate_X: (GLfloat) x Y: (GLfloat) y Z: (GLfloat) z
{
    glTranslatef(x, y, z);
}
 
// Frame control
- (int) frameNumber
{
    return m_frameNumber;
}
 
- (void) frameBegin: (int) frameNumber
{
    [[self openGLContext] makeCurrentContext];
    
    glClearColor(0, 0, 0, 0);
    glClear(GL_COLOR_BUFFER_BIT + GL_DEPTH_BUFFER_BIT);
 
    m_updateDisplay = 0;
 
    // Enter modeling mode
    glMatrixMode(GL_MODELVIEW);
    
    m_frameNumber = frameNumber;
}
 
- (void) frameBegin
{
    [self frameBegin: m_frameNumber + 1];
}
 
- (void) frameEnd
{
    [[self openGLContext] makeCurrentContext];
 
    m_updateDisplay = 1;
    
    [self setNeedsDisplay: true];
 
    [[self openGLContext] flushBuffer];
}
 
// Debug
- (void) drawAxis
{
    glBegin(GL_LINES);
    
    glColor3f(1, 0, 0);
    glVertex3f(0, 0, 0);
    glVertex3f(1, 0, 0);
 
    
    glColor3f(0, 1, 0);
    glVertex3f(0, 0, 0);
    glVertex3f(0, 1, 0);
    
    glColor3f(0, 0, 1);
    glVertex3f(0, 0, 0);
    glVertex3f(0, 0, 1);
    
    glEnd();
}
 
// Vertex array attributes
- (void) setGLVertexArrayAttributes: (VariableFormatVertex *) vertices atVertex: (GLfloat *) pVertex
{
    unsigned int    vertexAttributes = [vertices vertexAttributes];
    int         byteStride = [vertices byteStride]; 
    int         i;
 
    // Always enable XYZ
    glEnableClientState(GL_VERTEX_ARRAY);
    glVertexPointer(4, GL_FLOAT, byteStride, pVertex);
 
    // Enable / Disable all texture vertex arrays
    for(i=0; i<8; i++)
    {
        // Select texture unit
        glClientActiveTexture(GL_TEXTURE0 + i);
        
        // enable / disable unit
        if (vertexAttributes & (0x1 << i))
        {
            glEnable(GL_TEXTURE_2D);
            glEnableClientState(GL_TEXTURE_COORD_ARRAY);
            glTexCoordPointer(2, GL_FLOAT, byteStride, [vertices Texture: i atVertex: pVertex]);
        }
        else
        {
            glDisable(GL_TEXTURE_2D);
            glDisableClientState(GL_TEXTURE_COORD_ARRAY);
        }
    }
 
    // Normal
    if (vertexAttributes & (0x1 << 8))
    {
        glEnableClientState(GL_NORMAL_ARRAY);
        glNormalPointer(GL_FLOAT, byteStride, [vertices Normal: pVertex]);
    }
    else
    {
        glDisableClientState(GL_NORMAL_ARRAY);    
    }
    
    // Color
    if (vertexAttributes & (0x1 << 9))
    {
        glEnableClientState(GL_COLOR_ARRAY);
        glColorPointer(3, GL_FLOAT, byteStride, [vertices Color: pVertex]);
    }
    else
    {
        glColor4f(0,0,0,1);
        glDisableClientState(GL_COLOR_ARRAY);    
    }
 
    // SecondaryColor
    if (vertexAttributes & (0x1 << 10))
    {
        glColor4f(0,0,0,1);
        glEnable(GL_COLOR_SUM);
        glEnableClientState(GL_SECONDARY_COLOR_ARRAY);
        glSecondaryColorPointer(3, GL_FLOAT, byteStride, [vertices SecondaryColor: pVertex]);
    }
    else
    {
        glColor4f(1,1,1,1);
        glDisable(GL_COLOR_SUM);
        glDisableClientState(GL_SECONDARY_COLOR_ARRAY);    
    }
 
    // Fog
    if (vertexAttributes & (0x1 << 11))
    {
        glEnableClientState(GL_FOG_COORDINATE_ARRAY);
        glFogCoordPointer(GL_FLOAT, byteStride, [vertices Fog: pVertex]);
    }
    else
    {
        glDisableClientState(GL_FOG_COORDINATE_ARRAY);    
    }
 
    if ([vertices useVAR])
    {
        [vertices flushVertexArrayRange];
    }    
}
 
// Vertex Array Primitive draw routines
- (void) drawVertexArray: (VariableFormatVertex *) vertices ofType: (GLint) type
{
    GLfloat *pVertex = [vertices atVertex: 0];
    int     nVertices = [vertices vertexCount];
 
    [self setGLVertexArrayAttributes: vertices atVertex: pVertex];
 
    switch(type)
    {
        case GL_POINTS:
        case GL_QUADS:
        case GL_LINES:
            glDrawArrays(type, 0, nVertices);
        break;
 
        case GL_LINE_STRIP:
        {
            if ([vertices isMesh])
            {
                GLint   i, j, rows, cols;
                GLint   *indices;
                
                rows = [vertices rows];
                cols = [vertices cols];
                
                indices = (GLint *)malloc(sizeof(GLint) * (cols + 1));
                
                for(i=0; i<rows; i++)
                {
                    for(j=0; j<cols; j++)
                    {
                        indices[j] = (i * cols) + j;
                    }
 
                    glDrawElements(type, cols, GL_UNSIGNED_INT, indices);
                }
                
                for(j=0; j<cols; j++)
                {
                    for(i=0; i<rows; i++)
                    {
                        indices[i] = (i * cols) + j;
                    }
 
                    glDrawElements(type, rows, GL_UNSIGNED_INT, indices);
                }
                
                free(indices);
            }
        }
        break;
        
        case GL_QUAD_STRIP:
        {
            if ([vertices isMesh])
            {
                GLint   i, j, index, rows, cols;
                GLint   *indices;
                
                rows = [vertices rows];
                cols = [vertices cols];
                
                indices = (GLint *)malloc(2 * sizeof(GLint) * (cols + 1));
                
                for(i=0; i<rows-1; i++)
                {
                    for(index=0, j=0; j<cols; j++)
                    {
                        indices[index++] =       i * cols + j;
                        indices[index++] = (i + 1) * cols + j;
                    }
 
                    glDrawElements(type, 2*cols, GL_UNSIGNED_INT, indices);
                }
 
                for(i=rows-1,index=0, j=0; j<cols; j++)
                {
                    indices[index++] =       i * cols + j;
                    indices[index++] =          j;
                }
 
                glDrawElements(GL_QUAD_STRIP, 2*cols, GL_UNSIGNED_INT, indices);
                
                free(indices);
            }
        }
        break;
 
        case (GL_QUAD_STRIP | 0x1000):
        {
            if ([vertices isMesh])
            {
                GLint   i, j, index, rows, cols;
                GLint   *indices;
             
                rows = [vertices rows];
                cols = [vertices cols];
                
                indices = (GLint *)malloc(2 * sizeof(GLint) * (cols + 1));
                
                for(i=0; i<rows-1; i++)
                {
                    for(index=0, j=0; j<cols-1; j++)
                    {
                        indices[index++] =       i * cols + j;
                        indices[index++] = (i + 1) * cols + j;
                    }
 
                    glDrawElements(GL_QUAD_STRIP, 2*(cols-1), GL_UNSIGNED_INT, indices);
                }
                
                free(indices);
            }
        }
        break;
        
        case GL_LINE_LOOP:
        case GL_TRIANGLES:
        case GL_POLYGON:
        case GL_TRIANGLE_STRIP:
        case GL_TRIANGLE_FAN:
        break;
        
        default:
        break;        
    }
}
 
 
// Vertex program routines
- (void) loadVertexProgram: (NSString *) vertexProgramFilename
{
    const char  *pCstring;
    NSString    *temp_vertexProgramString;
    
    NSBundle    *pBundle = [NSBundle mainBundle];
    NSString    *pBundlePath = NULL;
    char    fullPath[1024];
    
    if (pBundle)
    {
        pBundlePath = [NSString stringWithString: [pBundle resourcePath]];
    }
    
    if (pBundlePath)
    {
        sprintf(fullPath, "%s/%s", [pBundlePath cString], [vertexProgramFilename cString]);
        
        m_vertexProgramString = [NSString stringWithContentsOfFile: [NSString stringWithCString: fullPath]];
    }
 
    temp_vertexProgramString = [NSString stringWithContentsOfFile: vertexProgramFilename];
 
    if (m_vertexProgramString)
    {
        pCstring = [m_vertexProgramString cString];
        
        glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
                            strlen(pCstring), pCstring);
 
        if (GL_NO_ERROR != glGetError())
        {
                fprintf(stderr, "Loading Program returned %s\n", (unsigned char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
        }
    }
}
 
- (void) unloadVertexProgram
{
    [m_vertexProgramString dealloc];
    
    m_vertexProgramString = NULL;
}
 
- (void) enableVertexPrograms
{
    glEnable(GL_VERTEX_PROGRAM_ARB);
}
 
- (void) disableVertexPrograms
{
    glDisable(GL_VERTEX_PROGRAM_ARB);
}
 
 
- (BOOL)acceptsFirstResponder
{
   return NO;
}
 
- (BOOL)becomeFirstResponder
{
   return  NO;
}
 
- (BOOL)resignFirstResponder
{
   return NO;
}
 
@end


Copyright © 2003 Apple Computer, Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2003-07-07