tests/shaders/glsl-fs-absoluteDifference-uint.shader_test

   1 [require]
   2 GL >= 3.0
   3 GLSL >= 1.30
   4 GL_EXT_shader_integer_mix
   5
   6 [vertex shader passthrough]
   7
   8 [fragment shader]
   9 #extension GL_EXT_shader_integer_mix: require
  10
  11 // { A, B, absoluteDifference(A, B) }
  12 uniform uvec3 data[40];
  13
  14 out vec4 color;
  15
  16 uint abs_diff(uint a, uint b)
  17 {
  18     /* This can fail if the compiler replaces the (a < b) with the result of
  19      * one of the subtractions.  For inputs a = 0x80000000, b = 4,
  20      * int(0x80000000) < 4, but int(0x80000000)-4 overflows and results in
  21      * 0x7ffffffc.  That's not less than zero, so the flags get set
  22      * differently than for (a < b).
  23      */
  24     return mix(a - b, b - a, a < b);
  25 }
  26
  27 void main()
  28 {
  29     uint idx = uint(gl_FragCoord.x) % uint(data.length());
  30     uvec3 v = data[idx];
  31
  32     if (abs_diff(v.x, v.y) == uint(v.z)) {
  33         color = vec4(0.0, 1.0, 0.0, 1.0);
  34     } else {
  35         color = vec4(1.0, 0.0, 0.0, 1.0);
  36     }
  37 }
  38
  39 [test]
  40 uniform uvec3 data[0] 0x80000000 0x80000000 0x00000000
  41 uniform uvec3 data[1] 0x80000000 0x80000001 0x00000001
  42 uniform uvec3 data[2] 0x80000000 0xf8000000 0x78000000
  43 uniform uvec3 data[3] 0x80000000 0xf8000001 0x78000001
  44 uniform uvec3 data[4] 0x80000000 0xff800000 0x7f800000
  45 uniform uvec3 data[5] 0x80000000 0xff800001 0x7f800001
  46 uniform uvec3 data[6] 0x80000000 0xfff80000 0x7ff80000
  47 uniform uvec3 data[7] 0x80000000 0xfff80001 0x7ff80001
  48 uniform uvec3 data[8] 0x80000000 0xffff8000 0x7fff8000
  49 uniform uvec3 data[9] 0x80000000 0xffff8001 0x7fff8001
  50 uniform uvec3 data[10] 0x80000000 0xfffff800 0x7ffff800
  51 uniform uvec3 data[11] 0x80000000 0xfffff801 0x7ffff801
  52 uniform uvec3 data[12] 0x80000000 0xffffff80 0x7fffff80
  53 uniform uvec3 data[13] 0x80000000 0xffffff81 0x7fffff81
  54 uniform uvec3 data[14] 0x80000000 0xfffffff8 0x7ffffff8
  55 uniform uvec3 data[15] 0x80000000 0xfffffff9 0x7ffffff9
  56 uniform uvec3 data[16] 0x80000000 0xfffffffa 0x7ffffffa
  57 uniform uvec3 data[17] 0x80000000 0xfffffffb 0x7ffffffb
  58 uniform uvec3 data[18] 0x80000000 0xfffffffc 0x7ffffffc
  59 uniform uvec3 data[19] 0x80000000 0xfffffffd 0x7ffffffd
  60 uniform uvec3 data[20] 0x80000000 0xfffffffe 0x7ffffffe
  61 uniform uvec3 data[21] 0x80000000 0xffffffff 0x7fffffff
  62 uniform uvec3 data[22] 0x80000000 0x00000000 0x80000000
  63 uniform uvec3 data[23] 0x80000000 0x00000001 0x7fffffff
  64 uniform uvec3 data[24] 0x80000000 0x00000002 0x7ffffffe
  65 uniform uvec3 data[25] 0x80000000 0x00000003 0x7ffffffd
  66 uniform uvec3 data[26] 0x80000000 0x00000004 0x7ffffffc
  67 uniform uvec3 data[27] 0x80000000 0x00000005 0x7ffffffb
  68 uniform uvec3 data[28] 0x80000000 0x00000006 0x7ffffffa
  69 uniform uvec3 data[29] 0x80000000 0x00000007 0x7ffffff9
  70 uniform uvec3 data[30] 0x80000000 0x00000008 0x7ffffff8
  71 uniform uvec3 data[31] 0x80000000 0x0000007f 0x7fffff81
  72 uniform uvec3 data[32] 0x80000000 0x00000080 0x7fffff80
  73 uniform uvec3 data[33] 0x80000000 0x000007ff 0x7ffff801
  74 uniform uvec3 data[34] 0x80000000 0x00000800 0x7ffff800
  75 uniform uvec3 data[35] 0x80000000 0x00007fff 0x7fff8001
  76 uniform uvec3 data[36] 0x80000000 0x00008000 0x7fff8000
  77 uniform uvec3 data[37] 0x80000000 0x0007ffff 0x7ff80001
  78 uniform uvec3 data[38] 0x80000000 0x00080000 0x7ff80000
  79 uniform uvec3 data[39] 0x80000000 0x007fffff 0x7f800001
  80
  81 draw rect -1 -1 2 2
  82 probe all rgb 0.0 1.0 0.0