//
// 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游戏应用源代码——bufordtaylor-Tower-Defense--cocos2d.zip （269个子文件） 
glu.c 3KB base64.c 2KB ccUtils.c 364B LICENSE.cocos2d 1KB LICENSE.cocosdenshion 1KB uthash.h 63KB utlist.h 36KB CCNode.h 16KB CCCompatibility.h 14KB CCParticleSystem.h 14KB CocosDenshion.h 13KB CCActionInterval.h 13KB CCMenuItem.h 12KB CCSprite.h 12KB ccCArray.h 12KB CCTexture2D.h 11KB CCDirectorIOS.h 10KB CDAudioManager.h 9KB ccConfig.h 9KB CCDirector.h 9KB CCTransition.h 8KB CGPointExtension.h 8KB ccMacros.h 7KB CCActionGrid3D.h 7KB CCActionTiledGrid.h 7KB CCScheduler.h 6KB CCEventDispatcher.h 6KB EAGLView.h 6KB CCSpriteBatchNode.h 6KB CCLayer.h 6KB CCTMXLayer.h 6KB ccTypes.h 6KB CCTMXXMLParser.h 6KB CCAction.h 6KB CCActionEase.h 6KB CCLabelBMFont.h 6KB CCSpriteFrame.h 5KB CCTMXTiledMap.h 5KB CCActionGrid.h 5KB CCTextureCache.h 5KB CCTextureAtlas.h 5KB CCSpriteFrameCache.h 5KB OpenGL_Internal.h 4KB CCActionInstant.h 4KB Sprite.h 4KB CLScoreServerRequest.h 4KB CLScoreServerPost.h 4KB CCTouchDispatcher.h 4KB CCActionManager.h 4KB cocos2d.h 4KB CCRibbon.h 4KB FontLabelStringDrawing.h 4KB SimpleAudioEngine.h 4KB CCGrid.h 4KB CCProtocols.h 4KB CCConfiguration.h 3KB CCTouchHandler.h 3KB CCTexturePVR.h 3KB CDOpenALSupport.h 3KB FontManager.h 3KB ZAttributedString.h 3KB CCDrawingPrimitives.h 3KB CCRenderTexture.h 3KB CCAtlasNode.h 3KB CCGL.h 3KB CCArray.h 3KB CCTouchDelegateProtocol.h 3KB CCTileMapAtlas.h 3KB CCProgressTimer.h 3KB CCCamera.h 3KB CCMotionStreak.h 3KB CCLabelAtlas.h 3KB CCMenu.h 3KB CCParticleExamples.h 3KB CDConfig.h 3KB CCLabelTTF.h 3KB MacGLView.h 3KB CCSpriteSheet.h 2KB CCParticleSystemQuad.h 2KB CCActionCamera.h 2KB CCNS.h 2KB CDataScanner.h 2KB CCActionTween.h 2KB CCTransitionPageTurn.h 2KB CCDirectorMac.h 2KB CCTMXObjectGroup.h 2KB CCActionProgressTimer.h 2KB ES1Renderer.h 2KB CCBlockSupport.h 2KB CCParticleSystemPoint.h 2KB CJSONDeserializer.h 2KB CCParallaxNode.h 2KB CJSONScanner.h 2KB FontLabel.h 2KB ESRenderer.h 2KB CCProfiling.h 2KB CCScene.h 2KB CCFileUtils.h 2KB CJSONSerializer.h 2KB ZFont.h 2KB共 269 条
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