# Tests non-uniform control flow in the vertex shader
# with fp64 functionality.
#
# The Intel vec4 backend used in gen7 for VS programs
# has peculiarities related to non-uniform control-flow
# with fp64 code. This test should verify that these
# situations are handled correctly.
#
# Expected result: red to green horizontal gradient

[require]
GLSL >= 1.50
GL_ARB_gpu_shader_fp64

[vertex shader]
#extension GL_ARB_gpu_shader_fp64 : require
#extension GL_ARB_explicit_attrib_location : require

layout(location=0) in vec4 pos;
layout(location=1) in float col;
uniform dvec2 u0;
uniform dvec2 u1;

out vec4 color;

void main()
{
  dvec2 res;
  gl_Position = pos;

  if (col == 0.0f) {
    res = 2.0lf * (u0 + u1);             // res = (1, 1) : yellow
    res.y -= 1.0;                        // res = (1, 0) : red
  } else {
    res = u1 - u0 - dvec2(0.3lf, 0.1lf); // res = (0, 0) : black
    res.y += 1.0lf;                      // res = (0, 1) : green
  }

  color = vec4(res.x, res.y, 0, 1);
}

[fragment shader]
varying vec4 color;

void main()
{
  gl_FragColor = color;
}

[vertex data]
pos/float/2   col/float/1
-1.0 -1.0     1.0
 1.0 -1.0     0.0
-1.0  1.0     0.0
 1.0  1.0     0.0

[test]
clear color 0.0 0.0 1.0 1.0
clear
uniform dvec2 u0 0.1 0.2
uniform dvec2 u1 0.4 0.3
draw arrays GL_TRIANGLE_STRIP 0 4