tests/spec/gl-3.2/gl-coord-replace-doesnt-eliminate-frag-tex-coords.c

   1 /**
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * Verify that when GL_COORD_REPLACE is set, fragment shader texture
  26  * coordinates (via the gl_TexCoord built-ins) don't get eliminated.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 PIGLIT_GL_TEST_CONFIG_BEGIN
  32
  33         config.supports_gl_compat_version = 21;
  34
  35         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  36
  37         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  38
  39 PIGLIT_GL_TEST_CONFIG_END
  40
  41 static const char *vstext =
  42         "#version 130\n"
  43         "in vec3 vertex;\n"
  44         "void main() {\n"
  45         "       gl_Position = vec4(vertex, 1.);\n"
  46         "       gl_PointSize = 16;\n"
  47         "}\n";
  48
  49 static const char *fstext =
  50         "#version 130\n"
  51         "void main() {\n"
  52         "       gl_FragColor = gl_TexCoord[0];\n"
  53         "}\n";
  54
  55 static GLuint vao;
  56 static GLuint vertBuff;
  57 static GLuint indexBuf;
  58
  59 static GLfloat vertices[] = {
  60         0.0, 0.0, 0.0
  61 };
  62 static GLsizei vertSize = sizeof(vertices);
  63
  64 static GLuint indices[] = {
  65         0
  66 };
  67 static GLsizei indSize = sizeof(indices);
  68
  69 static GLuint prog;
  70
  71 void
  72 piglit_init(int argc, char **argv)
  73 {
  74         GLuint vertIndex;
  75         piglit_require_GLSL_version(130);
  76
  77         prog = piglit_build_simple_program(vstext, fstext);
  78
  79         glUseProgram(prog);
  80
  81         glGenBuffers(1, &vertBuff);
  82         glBindBuffer(GL_ARRAY_BUFFER, vertBuff);
  83         glBufferData(GL_ARRAY_BUFFER, vertSize, vertices, GL_STATIC_DRAW);
  84
  85         glGenBuffers(1, &indexBuf);
  86         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
  87         glBufferData(GL_ELEMENT_ARRAY_BUFFER, indSize,
  88                         indices, GL_STATIC_DRAW);
  89
  90         glGenVertexArrays(1, &vao);
  91         glBindVertexArray(vao);
  92
  93         vertIndex = glGetAttribLocation(prog, "vertex");
  94
  95         glEnableVertexAttribArray(vertIndex);
  96         glVertexAttribPointer(vertIndex, 3, GL_FLOAT, GL_FALSE, 0, 0);
  97 }
  98
  99 enum piglit_result
 100 piglit_display(void)
 101 {
 102         bool pass = true;
 103         int x, y;
 104         int ptSize = 16;
 105
 106         glClearColor(.4, .4, .4, 1.);
 107         glClear(GL_COLOR_BUFFER_BIT);
 108
 109         glBindVertexArray(vao);
 110         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBuf);
 111
 112         glEnable(GL_PROGRAM_POINT_SIZE);
 113         glEnable(GL_POINT_SPRITE);
 114         glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE);
 115
 116         glDrawElements(GL_POINTS, ARRAY_SIZE(indices),
 117                         GL_UNSIGNED_INT, NULL);
 118
 119         for (y = 0; y < ptSize; y++) {
 120                 for (x = 0; x < ptSize; x++) {
 121                         float test[] = {(2 * x + 1) / (float)(ptSize * 2),
 122                                         1 - ((2 * y + 1) / (float)(ptSize * 2)),
 123                                         0};
 124                         pass = piglit_probe_pixel_rgb(
 125                                         piglit_width/2 - ptSize/2 + x,
 126                                         piglit_height/2 - ptSize/2 + y,
 127                                         test)
 128                                 && pass;
 129                 }
 130         }
 131
 132         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 133
 134         piglit_present_results();
 135
 136         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 137 }