# Test generated by:
# ../../../glsl-1.10/variable-index-read.sh 1.10

[require]
GLSL >= 1.10

[vertex shader]
#version 110
uniform int index;
uniform int col;
uniform vec4 expect;
varying mat4 m[3];
varying vec4 color;

void main()
{
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

    m[0] = mat4(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0);
    m[1] = mat4(17.0, 18.0, 19.0, 20.0, 21.0, 22.0, 23.0, 24.0, 25.0, 26.0, 27.0, 28.0, 29.0, 30.0, 31.0, 32.0);
    m[2] = mat4(33.0, 34.0, 35.0, 36.0, 37.0, 38.0, 39.0, 40.0, 41.0, 42.0, 43.0, 44.0, 45.0, 46.0, 47.0, 48.0);

    /* From page 23 (page 30 of the PDF) of the GLSL 1.10 spec:
     *
     *     "A vertex shader may also read varying variables, getting back the
     *     same values it has written. Reading a varying variable in a vertex
     *     shader returns undefined values if it is read before being
     *     written."
     */
    color = (m[index][col] == expect)
        ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
}

[fragment shader]
#version 110
uniform int index;
uniform int col;
uniform vec4 expect;
varying mat4 m[3];
varying vec4 color;

void main()
{
    /* There is some trickery here.  The fragment shader has to actually use
     * the varyings generated by the vertex shader, or the compiler (more
     * likely the linker) might demote the varying outputs to just be vertex
     * shader global variables.  Since the point of the test is the vertex
     * shader reading from a varying, that would defeat the test.
     */
    gl_FragColor = (m[index][col] == expect)
        ? color : vec4(1.0, 0.0, 0.0, 1.0);
}

[test]
clear color 0.5 0.5 0.5 0.5
clear
ortho

uniform int index 0
uniform int col 0
uniform vec4 expect 1 2 3 4
draw rect 5 5 10 10
probe rgb 10 10 0.0 1.0 0.0

uniform int col 1
uniform vec4 expect 5 6 7 8
draw rect 20 5 10 10
probe rgb 25 10 0.0 1.0 0.0

uniform int col 2
uniform vec4 expect 9 10 11 12
draw rect 35 5 10 10
probe rgb 40 10 0.0 1.0 0.0

uniform int col 3
uniform vec4 expect 13 14 15 16
draw rect 50 5 10 10
probe rgb 55 10 0.0 1.0 0.0

uniform int index 1
uniform int col 0
uniform vec4 expect 17 18 19 20
draw rect 75 5 10 10
probe rgb 80 10 0.0 1.0 0.0

uniform int col 1
uniform vec4 expect 21 22 23 24
draw rect 90 5 10 10
probe rgb 95 10 0.0 1.0 0.0

uniform int col 2
uniform vec4 expect 25 26 27 28
draw rect 105 5 10 10
probe rgb 110 10 0.0 1.0 0.0

uniform int col 3
uniform vec4 expect 29 30 31 32
draw rect 120 5 10 10
probe rgb 125 10 0.0 1.0 0.0

uniform int index 2
uniform int col 0
uniform vec4 expect 33 34 35 36
draw rect 145 5 10 10
probe rgb 150 10 0.0 1.0 0.0

uniform int col 1
uniform vec4 expect 37 38 39 40
draw rect 160 5 10 10
probe rgb 165 10 0.0 1.0 0.0

uniform int col 2
uniform vec4 expect 41 42 43 44
draw rect 175 5 10 10
probe rgb 180 10 0.0 1.0 0.0

uniform int col 3
uniform vec4 expect 45 46 47 48
draw rect 190 5 10 10
probe rgb 195 10 0.0 1.0 0.0