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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
attribute vec4 gtf_Vertex;
uniform mat4 gtf_ModelViewProjectionMatrix;
varying vec4 color;
#define ERROR_EPSILON 0.1
void main (void)
{
float x;
// Declare a 2 by 2 matrix with unique elements.
mat2 a = mat2(1.0, 2.0, // 1.0 4.0
4.0, 8.0); // 2.0 8.0
// Copy the matrix to another non-const matrix.
mat2 b = a;
// Check each element of the copy.
bool elms = true;
if(b[0][0] != 1.0) elms = false;
if(b[0][1] != 2.0) elms = false;
if(b[1][0] != 4.0) elms = false;
if(b[1][1] != 8.0) elms = false;
// Add up each row of the copy.
bool rows = true;
x = b[0][0] + b[1][0];
if(x < 5.0-ERROR_EPSILON || x > 5.0+ERROR_EPSILON) rows = false;
x = b[0][1] + b[1][1];
if(x < 10.0-ERROR_EPSILON || x > 10.0+ERROR_EPSILON) rows = false;
// Add up each column of the copy.
bool cols = true;
x = b[0][0] + b[0][1];
if(x < 3.0-ERROR_EPSILON || x > 3.0+ERROR_EPSILON) cols = false;
x = b[1][0] + b[1][1];
if(x < 12.0-ERROR_EPSILON || x > 12.0+ERROR_EPSILON) cols = false;
// Check if all of the operations were successful.
float gray = elms && rows && cols ? 1.0 : 0.0;
// Assign the varying variable color.
color = vec4(gray, gray, gray, 1.0);
// Transform the vertex position.
gl_Position = gtf_ModelViewProjectionMatrix * gtf_Vertex;
}
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