tests/shaders/glsl-arb-fragment-coord-conventions.c

   1 /*
   2  * Copyright © 2009 VMware, Inc.
   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  * Author:
  24  *    Brian Paul
  25  *
  26  */
  27
  28 /**
  29  * @file glsl-arb-fragment-coord-conventions.c
  30  *
  31  * Test ARB_fragment_coord_conventions extension.
  32  */
  33
  34 #include "piglit-util.h"
  35
  36 int piglit_width = 100, piglit_height = 100;
  37 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  38
  39 static const float black[4] = {0.0, 0.0, 0.0, 0.0};
  40 static const float red[4] = {1.0, 0.0, 0.0, 0.0};
  41 static const float green[4] = {0.0, 1.0, 0.0, 0.0};
  42 static const float yellow[4] = {1.0, 1.0, 0.0, 0.0};
  43 static const float gray25[4] = {0.25, 0.25, 0.0, 0.0};
  44 static const float gray75[4] = {0.75, 0.75, 0.0, 0.0};
  45
  46
  47 /*
  48  * For each of the various pixel center/origin layout qualifier modes
  49  * draw a full-window quad where the fragment color is a function of
  50  * the fragment coordinate.
  51  */
  52 enum piglit_result
  53 piglit_display(void)
  54 {
  55    GLuint prog;
  56    GLuint vs, fs;
  57    GLboolean pass = GL_TRUE;
  58
  59    piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  60
  61    vs = piglit_compile_shader(GL_VERTEX_SHADER, "shaders/glsl-mvp.vert");
  62
  63    /* No layout: test regular gl_FragCoord */
  64    {
  65       const char *fragtext =
  66          "void main(void) \n"
  67          "{ \n"
  68          "   gl_FragColor = gl_FragCoord * 0.01; \n"
  69          "} \n";
  70
  71       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
  72       prog = piglit_link_simple_program(vs, fs);
  73       glUseProgram(prog);
  74
  75       glClear(GL_COLOR_BUFFER_BIT);
  76
  77       piglit_draw_rect(0, 0, piglit_width, piglit_height);
  78
  79       /* lower-left corner */
  80       pass = pass && piglit_probe_pixel_rgb(0, 0, black);
  81
  82       /* upper-right corner */
  83       pass = pass && piglit_probe_pixel_rgb(99, 99, yellow);
  84    }
  85
  86    /* No layout, test pixel center is half integer */
  87    {
  88       const char *fragtext =
  89          "#extension GL_ARB_fragment_coord_conventions: enable \n"
  90          "void main(void) \n"
  91          "{ \n"
  92          "   gl_FragColor = fract(gl_FragCoord) + 0.25; \n"
  93          "   gl_FragColor.z = 0.0; \n"
  94          "} \n";
  95
  96       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
  97       prog = piglit_link_simple_program(vs, fs);
  98       glUseProgram(prog);
  99
 100       glClear(GL_COLOR_BUFFER_BIT);
 101
 102       piglit_draw_rect(0, 0, piglit_width, piglit_height);
 103
 104       /* lower-left corner */
 105       pass = pass && piglit_probe_pixel_rgb(0, 0, gray75);
 106
 107       /* upper-right corner */
 108       pass = pass && piglit_probe_pixel_rgb(99, 99, gray75);
 109    }
 110
 111    /* Pixel center integer */
 112    {
 113       const char *fragtext =
 114          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 115          "layout(pixel_center_integer) varying vec4 gl_FragCoord; \n"
 116          "void main(void) \n"
 117          "{ \n"
 118          "   gl_FragColor = fract(gl_FragCoord) + 0.25; \n"
 119          "   gl_FragColor.z = 0.0; \n"
 120          "} \n";
 121
 122       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 123       prog = piglit_link_simple_program(vs, fs);
 124       glUseProgram(prog);
 125
 126       glClear(GL_COLOR_BUFFER_BIT);
 127
 128       piglit_draw_rect(0, 0, piglit_width, piglit_height);
 129
 130       /* lower-left corner */
 131       pass = pass && piglit_probe_pixel_rgb(0, 0, gray25);
 132
 133       /* upper-right corner */
 134       pass = pass && piglit_probe_pixel_rgb(99, 99, gray25);
 135    }
 136
 137    /* Pixel origin upper left */
 138    {
 139       const char *fragtext =
 140          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 141          "layout(origin_upper_left) varying vec4 gl_FragCoord; \n"
 142          "void main(void) \n"
 143          "{ \n"
 144          "   gl_FragColor = gl_FragCoord * 0.01; \n"
 145          "   gl_FragColor.z = 0.0; \n"
 146          "} \n";
 147
 148       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 149       prog = piglit_link_simple_program(vs, fs);
 150       glUseProgram(prog);
 151
 152       glClear(GL_COLOR_BUFFER_BIT);
 153
 154       piglit_draw_rect(0, 0, piglit_width, piglit_height);
 155
 156       /* lower-left corner */
 157       pass = pass && piglit_probe_pixel_rgb(0, 0, green);
 158
 159       /* upper-right corner */
 160       pass = pass && piglit_probe_pixel_rgb(99, 99, red);
 161    }
 162
 163    /* Pixel origin upper left and pixel center integer */
 164    {
 165       static const float color1[4] = {0.125, 0.3725, 0.0, 0.0};
 166       static const float color2[4] = {0.3725, 0.125, 0.0, 0.0};
 167       const char *fragtext =
 168          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 169          "layout(origin_upper_left, pixel_center_integer) varying vec4 gl_FragCoord; \n"
 170          "void main(void) \n"
 171          "{ \n"
 172          "   gl_FragColor = gl_FragCoord * 0.0025 + 0.125; \n"
 173          "   gl_FragColor.z = 0.0; \n"
 174          "} \n";
 175
 176       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 177       prog = piglit_link_simple_program(vs, fs);
 178       glUseProgram(prog);
 179
 180       glClear(GL_COLOR_BUFFER_BIT);
 181
 182       piglit_draw_rect(0, 0, piglit_width, piglit_height);
 183
 184       /* lower-left corner */
 185       pass = pass && piglit_probe_pixel_rgb(0, 0, color1);
 186
 187       /* upper-right corner */
 188       pass = pass && piglit_probe_pixel_rgb(99, 99, color2);
 189    }
 190
 191    glutSwapBuffers();
 192
 193    return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 194 }
 195
 196
 197 void
 198 piglit_init(int argc, char **argv)
 199 {
 200    if (!GLEW_VERSION_2_0) {
 201       printf("Requires OpenGL 2.0\n");
 202       piglit_report_result(PIGLIT_SKIP);
 203    }
 204
 205    piglit_require_extension("GL_ARB_fragment_coord_conventions");
 206 }