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opengl-es-2.0texturescompression
denis.chylik
denis.chylik

Reputation: 1

opengl es 2.0 etc1 powervr SGX 540

I have a problem with ETC1 textures. To load ETC1 textures I use own code that load raw data of ETC1 image, then i use GL operation to load data into GPU memory GLES20.glCompressedTexImage2D(GLES20.GL_TEXTURE_2D, 0, 0x8D64, textureWidth, textureHeight, 0, rawSize, data); but when device used PowerVR SGX540 GPU, only textures with dimension 512x512 draw correctly. And i don't understand why. OpenGL ES 2.0 standard says that I can use textures with non-power of two dimensions. Please help me to resolve my problem.

Upvotes: 0

Views: 1056

Answers (1)

Reigertje
Reigertje

Reputation: 735

It is true that OpenGL ES 2.0 does not have the power of two restriction, however wrap modes and min filter are restricted. Please read the notes on http://www.khronos.org/opengles/sdk/docs/man/xhtml/glTexParameter.xml which states:

Similarly, if the width or height of a texture image are not powers of two and either the GL_TEXTURE_MIN_FILTER is set to one of the functions that requires mipmaps or the GL_TEXTURE_WRAP_S or GL_TEXTURE_WRAP_T is not set to GL_CLAMP_TO_EDGE, then the texture image unit will return (R, G, B, A) = (0, 0, 0, 1).

Also I recommend you to read the answer and comments on this question: Can OpenGL ES render textures of non base 2 dimensions?

Upvotes: 1

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