Google released a new version with native x86 processor support, which sped things up a bit. It also supports OpenGL ES 2.0,faster-emulator-with-better-hardware : As a bonus, since we’re now supporting OpenGL ES 2.0, your OpenGL games can now run inside the emulator. Note: When creating a virtual machine, make sure to select the “GPU emulation” … Read more
Each shader stage has its own frequency of invocations. I will use the OpenGL terminology, but D3D works the same way (since they’re both modelling the same hardware relationships). Vertex Shaders These are the second most complicated. They execute once for every input vertex… kinda. If you are using non-indexed rendering, then the ratio is … Read more
I haven’t test the following but i will decompose the conversion in 3 steps: Extract info for your image: UIImage* image = [UIImage imageNamed:@”imageToApplyAsATexture.png”]; CGImageRef imageRef = [image CGImage]; int width = CGImageGetWidth(imageRef); int height = CGImageGetHeight(imageRef); Allocate a textureData with the above properties: GLubyte* textureData = (GLubyte *)malloc(width * height * 4); // if … Read more
The following code is specifically for the iPhone 4 GPU using OpenGL ES 2.0. I have no experience with WebGL so I cant claim to know how the code will work in that context. Furthermore the main problem here is that highp float is not 32 bits but is instead 24 bit. My solution is … Read more
Make sure your graphics driver is updated Go to tools Go to Android Select AVD Manager. click on the pencil icon in under Action Click Advanced Settings button. In Emulated Performance row change Graphics to Software GLES 2.0 In Memory, row change RAM field to 512(minimum).
Yes, on iOS Core Graphics (Quartz) appears to be layered on top of OpenGL ES for drawing that targets the screen, although not in an explicit way that we have access to. Core Graphics takes vector elements (lines, arcs, etc.) and some raster ones (images) and processes them for display to the screen or for … Read more
As explained in ‘OpenGLES preloading textures in other thread‘ there are two separate steps: bitmap creation and bitmap upload. In most cases you should be fine by just doing the bitmap creation on a secondary thread — which is fairly easy. If you experience frame drops while uploading the textures, call texImage2D from a background … Read more
A highly optimized shader-based approach for performing a nine-hit Gaussian blur was presented by Daniel Rákos. His process uses the underlying interpolation provided by texture filtering in hardware to perform a nine-hit filter using only five texture reads per pass. This is also split into separate horizontal and vertical passes to further reduce the number … Read more
First thing you should know is that in OpenGL, transformation matrices are multiplied from right. What does it mean? It means that the last transformation you write gets applied to the object first. So let’s look at your code: gl.glScalef(0.8f, 0.8f, 0.8f); gl.glTranslatef(0.0f, 0.0f, -z); gl.glRotatef(xrot, 1.0f, 0.0f, 0.0f); //X gl.glRotatef(yrot, 0.0f, 1.0f, 0.0f); //Y … Read more
You need to create an EAGLSharegroup. Check out this thread on sharing OpenGL contexts between threads. UPDATE Previous to iOS5 I shared OpenGL contexts between threads to allow asynchronous loading of textures from disk. But iOS5’s CVOpenGLESTextureCaches essentially make texture uploads free so I don’t need shareGroups anymore and my code is simpler and faster.