//
// cocos2d (incomplete) GLU implementation
//
// gluLookAt and gluPerspective from:
// http://jet.ro/creations (San Angeles Observation)
//
//
// Only compile this code on iOS. These files should NOT be included on your Mac project.
// But in case they are included, it won't be compiled.
#import <Availability.h>
#ifdef __IPHONE_OS_VERSION_MAX_ALLOWED
#import <OpenGLES/ES1/gl.h>
#import <math.h>
#import "../../Support/OpenGL_Internal.h"
#include "glu.h"
void gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
{
GLfloat xmin, xmax, ymin, ymax;
ymax = zNear * (GLfloat)tanf(fovy * (float)M_PI / 360);
ymin = -ymax;
xmin = ymin * aspect;
xmax = ymax * aspect;
glFrustumf(xmin, xmax,
ymin, ymax,
zNear, zFar);
}
void gluLookAt(GLfloat eyex, GLfloat eyey, GLfloat eyez,
GLfloat centerx, GLfloat centery, GLfloat centerz,
GLfloat upx, GLfloat upy, GLfloat upz)
{
GLfloat m[16];
GLfloat x[3], y[3], z[3];
GLfloat mag;
/* Make rotation matrix */
/* Z vector */
z[0] = eyex - centerx;
z[1] = eyey - centery;
z[2] = eyez - centerz;
mag = (float)sqrtf(z[0] * z[0] + z[1] * z[1] + z[2] * z[2]);
if (mag) {
z[0] /= mag;
z[1] /= mag;
z[2] /= mag;
}
/* Y vector */
y[0] = upx;
y[1] = upy;
y[2] = upz;
/* X vector = Y cross Z */
x[0] = y[1] * z[2] - y[2] * z[1];
x[1] = -y[0] * z[2] + y[2] * z[0];
x[2] = y[0] * z[1] - y[1] * z[0];
/* Recompute Y = Z cross X */
y[0] = z[1] * x[2] - z[2] * x[1];
y[1] = -z[0] * x[2] + z[2] * x[0];
y[2] = z[0] * x[1] - z[1] * x[0];
/* cross product gives area of parallelogram, which is < 1.0 for
* non-perpendicular unit-length vectors; so normalize x, y here
*/
mag = (float)sqrtf(x[0] * x[0] + x[1] * x[1] + x[2] * x[2]);
if (mag) {
x[0] /= mag;
x[1] /= mag;
x[2] /= mag;
}
mag = (float)sqrtf(y[0] * y[0] + y[1] * y[1] + y[2] * y[2]);
if (mag) {
y[0] /= mag;
y[1] /= mag;
y[2] /= mag;
}
#define M(row,col) m[col*4+row]
M(0, 0) = x[0];
M(0, 1) = x[1];
M(0, 2) = x[2];
M(0, 3) = 0.0f;
M(1, 0) = y[0];
M(1, 1) = y[1];
M(1, 2) = y[2];
M(1, 3) = 0.0f;
M(2, 0) = z[0];
M(2, 1) = z[1];
M(2, 2) = z[2];
M(2, 3) = 0.0f;
M(3, 0) = 0.0f;
M(3, 1) = 0.0f;
M(3, 2) = 0.0f;
M(3, 3) = 1.0f;
#undef M
glMultMatrixf(m);
/* Translate Eye to Origin */
glTranslatef(-eyex, -eyey, -eyez);
}
#endif // __IPHONE_OS_VERSION_MAX_ALLOWED
IOS应用源码之纹理过滤样例AWTextureFilter .zip （296个子文件） 
glu.c 3KB glu.c 2KB base64.c 2KB ccUtils.c 364B LICENSE.cocos2d 1KB LICENSE.cocosdenshion 1KB .DS_Store 6KB .DS_Store 6KB uthash.h 63KB utlist.h 36KB CCNode.h 17KB CCCompatibility.h 14KB CCParticleSystem.h 14KB CocosDenshion.h 14KB CCSprite.h 13KB CCMenuItem.h 13KB CCIntervalAction.h 13KB CCActionInterval.h 13KB ccCArray.h 12KB CCTexture2D.h 11KB CCDirectorIOS.h 11KB ccConfig.h 10KB CCDirector.h 9KB CDAudioManager.h 9KB CCTransition.h 8KB CCLayer.h 8KB CGPointExtension.h 8KB ccMacros.h 7KB EAGLView.h 7KB CCActionGrid3D.h 7KB CCTiledGridAction.h 7KB CCActionTiledGrid.h 7KB CCEventDispatcher.h 7KB CCGrid3DAction.h 6KB CCScheduler.h 6KB CCSpriteBatchNode.h 6KB CCTMXLayer.h 6KB EAGLView.h 6KB ccTypes.h 6KB CCTMXXMLParser.h 6KB CCAction.h 6KB CCEaseAction.h 6KB CCActionEase.h 6KB CCLabelBMFont.h 6KB CCBitmapFontAtlas.h 5KB CCTMXTiledMap.h 5KB CCTextureCache.h 5KB CCGridAction.h 5KB CCActionGrid.h 5KB CCTextureAtlas.h 5KB CCActionInstant.h 5KB CCSpriteFrameCache.h 5KB CCAnimation.h 5KB OpenGL_Internal.h 4KB CCInstantAction.h 4KB cocos2d.h 4KB CLScoreServerRequest.h 4KB CLScoreServerPost.h 4KB CCTouchDispatcher.h 4KB CCActionManager.h 4KB CCRibbon.h 4KB CCTouchDispatcher.h 4KB CCProtocols.h 4KB FontLabelStringDrawing.h 4KB CCRenderTexture.h 4KB SimpleAudioEngine.h 4KB CCGrid.h 4KB CCTexturePVR.h 3KB CCTouchHandler.h 3KB CCSpriteFrame.h 3KB CCConfiguration.h 3KB CDOpenALSupport.h 3KB FontManager.h 3KB CCTouchHandler.h 3KB CCCamera.h 3KB CCDirectorMac.h 3KB CCPVRTexture.h 3KB CCDrawingPrimitives.h 3KB ZAttributedString.h 3KB CCAtlasNode.h 3KB CCGL.h 3KB CCArray.h 3KB CCTouchDelegateProtocol.h 3KB CCTileMapAtlas.h 3KB MacGLView.h 3KB CCProgressTimer.h 3KB CCMotionStreak.h 3KB CCMenu.h 3KB CCLabelAtlas.h 3KB CCParticleExamples.h 3KB CCTouchDelegateProtocol.h 3KB CDConfig.h 3KB CCLabelTTF.h 3KB CCLabel.h 3KB CCSpriteSheet.h 2KB CCParticleSystemQuad.h 2KB CCActionCamera.h 2KB CCQuadParticleSystem.h 2KB CCCameraAction.h 2KB CCNS.h 2KB共 296 条
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