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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/GraphicsImaging/index.html">Graphics & Imaging</a> > <a href="../../samplecode/GraphicsImaging/idxOpenGL-date.html">OpenGL</a> > <A HREF="javascript:location.replace('index.html');">SurfaceVertexProgram</A> >
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<pre class="sourcecodebox">/*
* VolumeOpenGLView.m
*
* Created by Michael Larson on Tue Mar 11 2003.
* Copyright (c) 2003 Apple Computer. All rights reserved.
*
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
("Apple") in consideration of your agreement to the following 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 Computer, 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.
*
*/
#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
</pre>
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