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POcocos2d and glReadPixels don't work?
 

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  1. POcocos2d and glReadPixels don't work?
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    <p>i have a problem with cocos2d and glReadPixels because don't work correctly. I found in web a code for pixel perfect collision and i modified for my app, but with the animation or more fast animation don't work.</p> <p>This is the code:</p> <p><code>-(BOOL) isCollisionBetweenSpriteA:(CCSprite*)spr1 spriteB:(CCSprite*)spr2 pixelPerfect:(BOOL)pp { BOOL isCollision = NO; CGRect intersection = CGRectIntersection([spr1 boundingBox], [spr2 boundingBox]);</p> <pre><code>// Look for simple bounding box collision if (!CGRectIsEmpty(intersection)) { // If we're not checking for pixel perfect collisions, return true if (!pp) {return YES;} // Get intersection info unsigned int x = intersection.origin.x; unsigned int y = intersection.origin.y; unsigned int w = intersection.size.width; unsigned int h = intersection.size.height; unsigned int numPixels = w * h; //NSLog(@"\nintersection = (%u,%u,%u,%u), area = %u",x,y,w,h,numPixels); // Draw into the RenderTexture [_rt beginWithClear:0 g:0 b:0 a:0]; // Render both sprites: first one in RED and second one in GREEN glColorMask(1, 0, 0, 1); [spr1 visit]; glColorMask(0, 1, 0, 1); [spr2 visit]; glColorMask(1, 1, 1, 1); // Get color values of intersection area ccColor4B *buffer = malloc( sizeof(ccColor4B) * numPixels ); glReadPixels(x, y, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buffer); /******* All this is for testing purposes *********/ // Draw the intersection rectangle in BLUE (testing purposes) /**************************************************/ [_rt end]; // Read buffer unsigned int step = 1; for(unsigned int q=0; q&lt;1; q+=step) { ccColor4B color = buffer[q]; if (color.r &gt; 0 &amp;&amp; color.g &gt; 0) { isCollision = YES; break; } } // Free buffer memory free(buffer); } return isCollision; </code></pre> <p>}</code></p> <p>where is the problem?I tried but nothing.</p> <p>Thank you very much. regards.</p>
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