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POGLKit & adding tints to textures
 

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    <p>I am having issue with tinting a PNG image with GLKit.</p> <p>I have a white PNG image that I load into the application and then use it to create a texture:</p> <pre><code>UIImage *image = [ UIImage imageNamed:@"brushImage" ]; NSError *error = nil; texture_m = [[ GLKTextureLoader textureWithCGImage:image.CGImage options:nil error:&amp;error] retain ]; if (error) { NSLog(@"Error loading texture from image: %@",error); } </code></pre> <p>the texture is created with no errors.</p> <p>however when I want to render the texture with blend activated the colour seems to be ignored and I get a white image. I had no issues when I was doing this in OpenGL1 were the image would pick up the colour that was defined in <code>glColor4f()</code>. Here is my render code:</p> <pre><code>-(void)render{ if (texture_m != nil) { effect_m.texture2d0.enabled = GL_TRUE; effect_m.texture2d0.envMode = GLKTextureEnvModeReplace; effect_m.texture2d0.target = GLKTextureTarget2D; effect_m.texture2d0.name = texture_m.name; } [effect_m prepareToDraw]; glClear(GL_COLOR_BUFFER_BIT); GLfloat squareVertices[] = { 50, 50, 150, 50, 50, 150, 150, 150 }; GLfloat squareTexture[] = { 0, 0, 1, 0, 0, 1, 1, 1 }; glColor4f( 1, 0, 0, 1 ); glEnableVertexAttribArray(GLKVertexAttribPosition); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glEnable(GL_BLEND); glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ); glVertexAttribPointer(GLKVertexAttribPosition, 2, GL_FLOAT, GL_FALSE, 0, squareVertices); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 0, squareTexture ); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); glDisable(GL_BLEND); glDisableVertexAttribArray(GLKVertexAttribPosition); glDisableVertexAttribArray(GLKVertexAttribTexCoord0); } </code></pre> <p>Could anybody help to solve this issue Thanks</p> <p>Reza</p>
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