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+/*
+ * cocos2d for iPhone: http://www.cocos2d-iphone.org
+ *
+ * Copyright (c) 2009 Leonardo Kasperavičius
+ *
+ * Copyright (c) 2008-2010 Ricardo Quesada
+ * Copyright (c) 2011 Zynga Inc.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+
+// opengl
+#import "Platforms/CCGL.h"
+
+// cocos2d
+#import "ccConfig.h"
+#import "CCParticleSystemQuad.h"
+#import "CCTextureCache.h"
+#import "ccMacros.h"
+#import "CCSpriteFrame.h"
+
+// support
+#import "Support/OpenGL_Internal.h"
+#import "Support/CGPointExtension.h"
+
+@implementation CCParticleSystemQuad
+
+
+// overriding the init method
+-(id) initWithTotalParticles:(NSUInteger) numberOfParticles
+{
+        // base initialization
+        if( (self=[super initWithTotalParticles:numberOfParticles]) ) {
+        
+                // allocating data space
+                quads_ = calloc( sizeof(quads_[0]) * totalParticles, 1 );
+                indices_ = calloc( sizeof(indices_[0]) * totalParticles * 6, 1 );
+                
+                if( !quads_ || !indices_) {
+                        NSLog(@"cocos2d: Particle system: not enough memory");
+                        if( quads_ )
+                                free( quads_ );
+                        if(indices_)
+                                free(indices_);
+                        
+                        [self release];
+                        return nil;
+                }
+                
+                // initialize only once the texCoords and the indices
+                [self initTexCoordsWithRect:CGRectMake(0, 0, [texture_ pixelsWide], [texture_ pixelsHigh])];
+                [self initIndices];
+
+#if CC_USES_VBO
+                // create the VBO buffer
+                glGenBuffers(1, &quadsID_);
+                
+                // initial binding
+                glBindBuffer(GL_ARRAY_BUFFER, quadsID_);
+                glBufferData(GL_ARRAY_BUFFER, sizeof(quads_[0])*totalParticles, quads_,GL_DYNAMIC_DRAW);        
+                glBindBuffer(GL_ARRAY_BUFFER, 0);
+#endif
+        }
+                
+        return self;
+}
+
+-(void) dealloc
+{
+        free(quads_);
+        free(indices_);
+#if CC_USES_VBO
+        glDeleteBuffers(1, &quadsID_);
+#endif
+        
+        [super dealloc];
+}
+
+// pointRect is in Points coordinates.
+-(void) initTexCoordsWithRect:(CGRect)pointRect
+{
+        // convert to pixels coords
+        CGRect rect = CGRectMake(
+                                                         pointRect.origin.x * CC_CONTENT_SCALE_FACTOR(),
+                                                         pointRect.origin.y * CC_CONTENT_SCALE_FACTOR(),
+                                                         pointRect.size.width * CC_CONTENT_SCALE_FACTOR(),
+                                                         pointRect.size.height * CC_CONTENT_SCALE_FACTOR() );
+
+        GLfloat wide = [texture_ pixelsWide];
+        GLfloat high = [texture_ pixelsHigh];
+
+#if CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
+        GLfloat left = (rect.origin.x*2+1) / (wide*2);
+        GLfloat bottom = (rect.origin.y*2+1) / (high*2);
+        GLfloat right = left + (rect.size.width*2-2) / (wide*2);
+        GLfloat top = bottom + (rect.size.height*2-2) / (high*2);
+#else
+        GLfloat left = rect.origin.x / wide;
+        GLfloat bottom = rect.origin.y / high;
+        GLfloat right = left + rect.size.width / wide;
+        GLfloat top = bottom + rect.size.height / high;
+#endif // ! CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
+        
+        // Important. Texture in cocos2d are inverted, so the Y component should be inverted
+        CC_SWAP( top, bottom);
+        
+        for(NSUInteger i=0; i<totalParticles; i++) {
+                // bottom-left vertex:
+                quads_[i].bl.texCoords.u = left;
+                quads_[i].bl.texCoords.v = bottom;
+                // bottom-right vertex:
+                quads_[i].br.texCoords.u = right;
+                quads_[i].br.texCoords.v = bottom;
+                // top-left vertex:
+                quads_[i].tl.texCoords.u = left;
+                quads_[i].tl.texCoords.v = top;
+                // top-right vertex:
+                quads_[i].tr.texCoords.u = right;
+                quads_[i].tr.texCoords.v = top;
+        }
+}
+
+-(void) setTexture:(CCTexture2D *)texture withRect:(CGRect)rect
+{
+        // Only update the texture if is different from the current one
+        if( [texture name] != [texture_ name] )
+                [super setTexture:texture];
+        
+        [self initTexCoordsWithRect:rect];
+}
+
+-(void) setTexture:(CCTexture2D *)texture
+{
+        CGSize s = [texture contentSize];
+        [self setTexture:texture withRect:CGRectMake(0,0, s.width, s.height)];
+}
+
+-(void) setDisplayFrame:(CCSpriteFrame *)spriteFrame
+{
+
+        NSAssert( CGPointEqualToPoint( spriteFrame.offsetInPixels , CGPointZero ), @"QuadParticle only supports SpriteFrames with no offsets");
+
+        // update texture before updating texture rect
+        if ( spriteFrame.texture.name != texture_.name )
+                [self setTexture: spriteFrame.texture]; 
+}
+
+-(void) initIndices
+{
+        for( NSUInteger i=0;i< totalParticles;i++) {
+                const NSUInteger i6 = i*6;
+                const NSUInteger i4 = i*4;
+                indices_[i6+0] = (GLushort) i4+0;
+                indices_[i6+1] = (GLushort) i4+1;
+                indices_[i6+2] = (GLushort) i4+2;
+                
+                indices_[i6+5] = (GLushort) i4+1;
+                indices_[i6+4] = (GLushort) i4+2;
+                indices_[i6+3] = (GLushort) i4+3;
+        }
+}
+
+-(void) updateQuadWithParticle:(tCCParticle*)p newPosition:(CGPoint)newPos
+{
+        // colors
+        ccV2F_C4B_T2F_Quad *quad = &(quads_[particleIdx]);
+        
+        ccColor4B color = { p->color.r*255, p->color.g*255, p->color.b*255, p->color.a*255};
+        quad->bl.colors = color;
+        quad->br.colors = color;
+        quad->tl.colors = color;
+        quad->tr.colors = color;
+        
+        // vertices
+        GLfloat size_2 = p->size/2;
+        if( p->rotation ) {
+                GLfloat x1 = -size_2;
+                GLfloat y1 = -size_2;
+                
+                GLfloat x2 = size_2;
+                GLfloat y2 = size_2;
+                GLfloat x = newPos.x;
+                GLfloat y = newPos.y;
+                
+                GLfloat r = (GLfloat)-CC_DEGREES_TO_RADIANS(p->rotation);
+                GLfloat cr = cosf(r);
+                GLfloat sr = sinf(r);
+                GLfloat ax = x1 * cr - y1 * sr + x;
+                GLfloat ay = x1 * sr + y1 * cr + y;
+                GLfloat bx = x2 * cr - y1 * sr + x;
+                GLfloat by = x2 * sr + y1 * cr + y;
+                GLfloat cx = x2 * cr - y2 * sr + x;
+                GLfloat cy = x2 * sr + y2 * cr + y;
+                GLfloat dx = x1 * cr - y2 * sr + x;
+                GLfloat dy = x1 * sr + y2 * cr + y;
+                
+                // bottom-left
+                quad->bl.vertices.x = ax;
+                quad->bl.vertices.y = ay;
+                
+                // bottom-right vertex:
+                quad->br.vertices.x = bx;
+                quad->br.vertices.y = by;
+                
+                // top-left vertex:
+                quad->tl.vertices.x = dx;
+                quad->tl.vertices.y = dy;
+                
+                // top-right vertex:
+                quad->tr.vertices.x = cx;
+                quad->tr.vertices.y = cy;
+        } else {
+                // bottom-left vertex:
+                quad->bl.vertices.x = newPos.x - size_2;
+                quad->bl.vertices.y = newPos.y - size_2;
+                
+                // bottom-right vertex:
+                quad->br.vertices.x = newPos.x + size_2;
+                quad->br.vertices.y = newPos.y - size_2;
+                
+                // top-left vertex:
+                quad->tl.vertices.x = newPos.x - size_2;
+                quad->tl.vertices.y = newPos.y + size_2;
+                
+                // top-right vertex:
+                quad->tr.vertices.x = newPos.x + size_2;
+                quad->tr.vertices.y = newPos.y + size_2;                                
+        }
+}
+
+-(void) postStep
+{
+#if CC_USES_VBO
+        glBindBuffer(GL_ARRAY_BUFFER, quadsID_);
+        glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(quads_[0])*particleCount, quads_);
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+#endif
+}
+
+// overriding draw method
+-(void) draw
+{       
+        [super draw];
+
+        // Default GL states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
+        // Needed states: GL_TEXTURE_2D, GL_VERTEX_ARRAY, GL_COLOR_ARRAY, GL_TEXTURE_COORD_ARRAY
+        // Unneeded states: -
+
+        glBindTexture(GL_TEXTURE_2D, [texture_ name]);
+
+#define kQuadSize sizeof(quads_[0].bl)
+
+#if CC_USES_VBO
+        glBindBuffer(GL_ARRAY_BUFFER, quadsID_);
+
+        glVertexPointer(2,GL_FLOAT, kQuadSize, 0);
+
+        glColorPointer(4, GL_UNSIGNED_BYTE, kQuadSize, (GLvoid*) offsetof(ccV2F_C4B_T2F,colors) );
+        
+        glTexCoordPointer(2, GL_FLOAT, kQuadSize, (GLvoid*) offsetof(ccV2F_C4B_T2F,texCoords) );
+#else // vertex array list
+
+        NSUInteger offset = (NSUInteger) quads_;
+
+        // vertex
+        NSUInteger diff = offsetof( ccV2F_C4B_T2F, vertices);
+        glVertexPointer(2,GL_FLOAT, kQuadSize, (GLvoid*) (offset+diff) );
+        
+        // color
+        diff = offsetof( ccV2F_C4B_T2F, colors);
+        glColorPointer(4, GL_UNSIGNED_BYTE, kQuadSize, (GLvoid*)(offset + diff));
+        
+        // tex coords
+        diff = offsetof( ccV2F_C4B_T2F, texCoords);
+        glTexCoordPointer(2, GL_FLOAT, kQuadSize, (GLvoid*)(offset + diff));            
+
+#endif // ! CC_USES_VBO
+        
+        BOOL newBlend = blendFunc_.src != CC_BLEND_SRC || blendFunc_.dst != CC_BLEND_DST;
+        if( newBlend )
+                glBlendFunc( blendFunc_.src, blendFunc_.dst );
+        
+        NSAssert( particleIdx == particleCount, @"Abnormal error in particle quad");
+        glDrawElements(GL_TRIANGLES, (GLsizei) particleIdx*6, GL_UNSIGNED_SHORT, indices_);
+        
+        // restore blend state
+        if( newBlend )
+                glBlendFunc( CC_BLEND_SRC, CC_BLEND_DST );
+
+#if CC_USES_VBO
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+#endif
+
+        // restore GL default state
+        // -
+}
+
+@end
+
+