# Reading mat4 components from UBOs should respect row/column_major layouts.

[require]
GLSL >= 1.30
GL_ARB_uniform_buffer_object

[vertex shader passthrough]

[fragment shader]
#extension GL_ARB_uniform_buffer_object: require

out vec4 outcolor;

uniform Block {
    uint test_variant;
    layout(row_major) mat4 m_row_major;
    layout(column_major) mat4 m_col_major;
};

vec4 extract_by_index(mat4 m) {
    return vec4(m[0][0], m[3][0], m[0][3], m[1][2]);
}

vec4 extract_swizzle(mat4 m) {
    return vec4(m[0].x,  m[3].x,  m[0].w,  m[1].z);
}

void main()
{
    /* These variants should result in the same color */
    if (test_variant == 0u)
        outcolor = extract_by_index(m_col_major);
    else if (test_variant == 1u)
        outcolor = extract_swizzle(m_col_major);
    else if (test_variant == 2u)
        outcolor = extract_by_index(m_row_major);
    else if (test_variant == 3u)
        outcolor = extract_swizzle(m_row_major);


    /* These variants should result in the same color (col sum) */
    else if (test_variant == 100u)
        outcolor = vec4(1, 1, 1, 1) * m_col_major;
    else if (test_variant == 101u)
        outcolor = vec4(1, 1, 1, 1) * m_row_major;


    /* These variants should result in the same color (row sum) */
    else if (test_variant == 200u)
        outcolor = m_col_major * vec4(1, 1, 1, 1);
    else if (test_variant == 201u)
        outcolor = m_row_major * vec4(1, 1, 1, 1);
}

[test]
# Matrix:
# 0.01 0.05 0.09 0.13
# 0.02 0.06 0.10 0.14
# 0.03 0.07 0.11 0.15
# 0.04 0.08 0.12 0.16

# shader_runner "uniform" command always expects data in column-major format,
# but will use the layout specified in the uniform block to upload matrix data
# to the GPU, so both lines look similar, but result in different buffer
# contents.
uniform mat4 m_row_major   0.01 0.02 0.03 0.04   0.05 0.06 0.07 0.08   0.09 0.10 0.11 0.12   0.13 0.14 0.15 0.16
uniform mat4 m_col_major   0.01 0.02 0.03 0.04   0.05 0.06 0.07 0.08   0.09 0.10 0.11 0.12   0.13 0.14 0.15 0.16
clear color 0.0 0.0 0.0 0.0

clear
uniform uint test_variant 0
draw rect -1 -1 2 2
probe all rgba 0.01 0.13 0.04 0.07

clear
uniform uint test_variant 1
draw rect -1 -1 2 2
probe all rgba 0.01 0.13 0.04 0.07

clear
uniform uint test_variant 2
draw rect -1 -1 2 2
probe all rgba 0.01 0.13 0.04 0.07

clear
uniform uint test_variant 3
draw rect -1 -1 2 2
probe all rgba 0.01 0.13 0.04 0.07

clear
uniform uint test_variant 100
draw rect -1 -1 2 2
probe all rgba 0.1 0.26 0.42 0.58

clear
uniform uint test_variant 101
draw rect -1 -1 2 2
probe all rgba 0.1 0.26 0.42 0.58

clear
uniform uint test_variant 200
draw rect -1 -1 2 2
probe all rgba 0.28 0.32 0.36 0.40

clear
uniform uint test_variant 201
draw rect -1 -1 2 2
probe all rgba 0.28 0.32 0.36 0.40