[Piglit] [PATCH] Add a test to check whether the LODs are independant in parallel texture lookups.

[Jose Fonseca]

I haven't tested it, but considering the recent discussion on mesa-dev about this, it looks good to me.

Do you have commit access to piglit?

Jose

----- Original Message -----
> Theorically, we should also test that as the fragment shader level,
> but the code would be way more complex and the code paths are shared
> in mesa.
>     
> That was designed to fix the issue in llvmpipe (which also exists in
> textureSize).  NVidia passes.  Surprisingly enough, softpipe fails.
>     
> Signed-off-by: Olivier Galibert <galibert at pobox.com>
> 
> diff --git
> a/tests/spec/glsl-1.30/execution/vs-textureLod-miplevels-2.shader_test
> b/tests/spec/glsl-1.30/execution/vs-textureLod-miplevels-2.shader_test
> new file mode 100644
> index 0000000..aed1fef
> --- /dev/null
> +++
> b/tests/spec/glsl-1.30/execution/vs-textureLod-miplevels-2.shader_test
> @@ -0,0 +1,58 @@
> +#
> +# A slightly more convoluted mipmap test.
> +#
> +# Create an 8x8 texture with four miplevels, colored red, green,
> blue, and
> +# white, respectively.  Draw a quad with each vertex looking up the
> color
> +# in a different lod.
> +#
> +# This verifies that textureLod() selects the proper miplevel for
> integer
> +# LODs when all vertices are given a different LOD.  Or on other
> words the
> +# test verifies that LODs are not improperly shared.
> +
> +[require]
> +GLSL >= 1.30
> +
> +[fragment shader]
> +#version 130
> +void main()
> +{
> +    gl_FragColor = gl_Color;
> +}
> +
> +[vertex shader]
> +#version 130
> +uniform sampler2D tex;
> +in vec4 vertex;
> +in float lod;
> +void main()
> +{
> +    gl_Position = gl_ModelViewProjectionMatrix * vertex;
> +    gl_FrontColor = textureLod(tex, vec2(0.5, 0.5), lod);
> +}
> +
> +[vertex data]
> +vertex/float/2  lod/float/1
> +-1.0 -1.0       0
> + 1.0 -1.0       1
> + 1.0  1.0       2
> +-1.0  1.0       3
> +
> +[test]
> +clear color 0.4 0.4 0.4 0.4
> +clear
> +
> +uniform int tex 0
> +texture miptree 0
> +
> +# Draw the miptree: basic integer LODs.
> +
> +texparameter 2D min nearest_mipmap_nearest
> +texparameter 2D mag nearest
> +
> +draw arrays GL_QUADS 0 4
> +
> +# Probes: integer LODs
> +relative probe rgba (0.0, 0.0) (1.0, 0.0, 0.0, 1.0)
> +relative probe rgba (1.0, 0.0) (0.0, 1.0, 0.0, 1.0)
> +relative probe rgba (1.0, 1.0) (0.0, 0.0, 1.0, 1.0)
> +relative probe rgba (0.0, 1.0) (1.0, 1.0, 1.0, 1.0)
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