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POGLKit on iOS5: setting texture prevents other drawing
 

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  1. POGLKit on iOS5: setting texture prevents other drawing
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    <p>I am attempting to do some very simple 2D drawing with GLKit, including using a texture. However, if I load the texture, but don't even use it in the drawing, somehow it prevents the drawing from taking place!</p> <p>Here is my setup code:</p> <pre><code>-(void) setup { effect = [[GLKBaseEffect alloc] init]; // comment this out - drawing takes place texture = [GLKTextureLoader textureWithCGImage:[UIImage imageNamed: @"arrow.png"].CGImage options:nil error: nil]; if (texture) { effect.texture2d0.envMode = GLKTextureEnvModeReplace; effect.texture2d0.target = GLKTextureTarget2D; effect.texture2d0.name = texture.name; }; // end of comment this out... effect.transform.projectionMatrix = GLKMatrix4MakeOrtho(0.0, self.bounds.size.width, self.bounds.size.height, 0.0, 1, -1); } </code></pre> <p>Here is my drawing code:</p> <pre><code>- (void)drawRect:(CGRect)rect { GLKVector2 vertices[4]; GLKVector4 colors[4]; vertices[0] = GLKVector2Make(20.0, 30.0); vertices[1] = GLKVector2Make(120.0, 45.0); vertices[2] = GLKVector2Make(70.0, 88.0); vertices[3] = GLKVector2Make(20.0, 80.0); for(int i = 0; i &lt; 4; i++) { colors[i] = GLKVector4Make(0.3, 0.8, 0.5, 1.0); }; glClearColor(0.85, 0.05, 0.1, 1.0); glClear(GL_COLOR_BUFFER_BIT); [effect prepareToDraw]; glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glEnableVertexAttribArray(GLKVertexAttribPosition); glEnableVertexAttribArray(GLKVertexAttribColor); glVertexAttribPointer(GLKVertexAttribPosition, 2, GL_FLOAT, GL_FALSE, 0, vertices); glVertexAttribPointer(GLKVertexAttribColor, 4, GL_FLOAT, GL_FALSE, 0, colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, 3); glDisableVertexAttribArray(GLKVertexAttribPosition); glDisableVertexAttribArray(GLKVertexAttribColor); glDisable(GL_BLEND); } </code></pre>
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    1. CODoes something basic like clearing the color buffer with something other than black give you the expected results? Is it possible that `GLKTextureLoader` is enabling texturing just by you uploading the texture? What do you see if you upload a texture that's a solid color and set it to clamp to edge?
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      1. POGLKit on iOS5: setting texture prevents other drawing
      1. USuser1118321
 

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