vk-bootstrap/example/shaders/vert.glsl

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#version 450
#extension GL_ARB_separate_shader_objects : enable
layout (location = 0) out vec3 fragColor;
vec2 positions[3] = vec2[](vec2 (0.0, -0.5), vec2 (0.5, 0.5), vec2 (-0.5, 0.5));
vec3 colors[3] = vec3[](vec3 (1.0, 0.0, 0.0), vec3 (0.0, 1.0, 0.0), vec3 (0.0, 0.0, 1.0));
void main ()
{
gl_Position = vec4 (positions[gl_VertexIndex], 0.0, 1.0);
fragColor = colors[gl_VertexIndex];
}