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Commit 597766f0 authored by Ian Romanick's avatar Ian Romanick Committed by Eric Engestrom
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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
parent 89ed84a0
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