i965: Disable EXT_texture_integer on Gfx4 and Gfx5
st_init_extensions (src/mesa/state_tracker/st_extensions.c) already enforces the GLSL 1.30 or EXT_gpu_shader4 requirement, so Crocus will already behave this way on this hardware. The EXT_texture_integer spec says: NV_gpu_program4 or EXT_gpu_shader4 is required. Without one of these extensions or GLSL 1.30, it is impossible to read integer values from a texture. The spec also says: This extension does not enforce type consistency for texture accesses or between fragment shaders and the corresponding framebuffer attachments. The results of a texture lookup from an integer texture are undefined: * for fixed-function fragment processing, or * for shader texture accesses expecting floating-point return values. The color components used for per-fragment operations and written into a color buffer are undefined: * for fixed-function fragment processing with an integer color buffer, * for fragment shaders that write floating-point color components to an integer color buffer, or * for fragment shaders that write integer color components to a color buffer with floating point or normalized integer components. So it's really a soft requirement, but also kind of rude to expose the extension without a way to use it properly. Closes: #4497 CC: mesa-stable