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-gl.h"
  35
  36 PIGLIT_GL_TEST_CONFIG_BEGIN
  37
  38         config.supports_gl_compat_version = 20;
  39
  40         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  41
  42 PIGLIT_GL_TEST_CONFIG_END
  43
  44
  45 /* Test size / region */
  46 #define WIDTH 100
  47 #define HEIGHT 100
  48
  49
  50 static const float black[4] = {0.0, 0.0, 0.0, 0.0};
  51 static const float red[4] = {1.0, 0.0, 0.0, 0.0};
  52 static const float green[4] = {0.0, 1.0, 0.0, 0.0};
  53 static const float yellow[4] = {1.0, 1.0, 0.0, 0.0};
  54 static const float gray25_l[4] = {0.25, 0.25, 0.0, 0.0};
  55 static const float gray25_r[4] = {0.25, 0.25, 1.0, 0.0};
  56 static const float gray75_l[4] = {0.75, 0.75, 0.5, 0.0};
  57 static const float gray75_r[4] = {0.75, 0.75, 1.0, 0.0};
  58
  59 static int test = 0;
  60
  61 /*
  62  * For each of the various pixel center/origin layout qualifier modes
  63  * draw a full-window quad where the fragment color is a function of
  64  * the fragment coordinate.
  65  */
  66 enum piglit_result
  67 piglit_display(void)
  68 {
  69    GLuint prog;
  70    GLuint vs, fs;
  71    GLboolean pass = GL_TRUE;
  72
  73    if (piglit_width < WIDTH || piglit_height < HEIGHT) {
  74       printf("window is too small.\n");
  75       return PIGLIT_SKIP;
  76    }
  77
  78    piglit_ortho_projection(WIDTH, HEIGHT, GL_FALSE);
  79
  80    vs = piglit_compile_shader(GL_VERTEX_SHADER, "shaders/glsl-mvp.vert");
  81
  82    /* No layout: test regular gl_FragCoord */
  83    if (piglit_automatic || test == 0)
  84    {
  85       const char *fragtext =
  86          "void main(void) \n"
  87          "{ \n"
  88          "   gl_FragColor = gl_FragCoord * 0.01; \n"
  89          "} \n";
  90
  91       printf("Regular gl_FragCoord\n");
  92       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
  93       prog = piglit_link_simple_program(vs, fs);
  94       glUseProgram(prog);
  95
  96       glClear(GL_COLOR_BUFFER_BIT);
  97       glViewport(0, 0, WIDTH, HEIGHT);
  98
  99       piglit_draw_rect(0, 0, WIDTH, HEIGHT);
 100
 101       /* lower-left corner */
 102       pass = piglit_probe_pixel_rgb(0, 0, black) && pass;
 103
 104       /* upper-right corner */
 105       pass = piglit_probe_pixel_rgb(WIDTH - 1, HEIGHT - 1, yellow) && pass;
 106    }
 107
 108    /* No layout, test pixel center is half integer */
 109    if (piglit_automatic || test == 1)
 110    {
 111       const char *fragtext =
 112          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 113          "void main(void) \n"
 114          "{ \n"
 115          "   gl_FragColor = fract(gl_FragCoord) + 0.25; \n"
 116          "   gl_FragColor.z = (gl_FragCoord.x + gl_FragCoord.y) * 0.5; \n"
 117          "} \n";
 118
 119       printf("Pixel center half integer\n");
 120       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 121       prog = piglit_link_simple_program(vs, fs);
 122       glUseProgram(prog);
 123
 124       glClear(GL_COLOR_BUFFER_BIT);
 125       glViewport(0, 0, WIDTH, HEIGHT);
 126
 127       piglit_draw_rect(0, 0, WIDTH, HEIGHT);
 128
 129       /* lower-left corner */
 130       pass = piglit_probe_pixel_rgb(0, 0, gray75_l) && pass;
 131
 132       /* upper-right corner */
 133       pass = piglit_probe_pixel_rgb(WIDTH - 1, HEIGHT - 1, gray75_r) && pass;
 134    }
 135
 136    /* Pixel center integer */
 137    if (piglit_automatic || test == 2)
 138    {
 139       const char *fragtext =
 140          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 141          "layout(pixel_center_integer) varying vec4 gl_FragCoord; \n"
 142          "void main(void) \n"
 143          "{ \n"
 144          "   gl_FragColor = fract(gl_FragCoord) + 0.25; \n"
 145          "   gl_FragColor.z = (gl_FragCoord.x + gl_FragCoord.y) * 0.5; \n"
 146          "} \n";
 147
 148       printf("Pixel center integer\n");
 149       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 150       prog = piglit_link_simple_program(vs, fs);
 151       glUseProgram(prog);
 152
 153       glClear(GL_COLOR_BUFFER_BIT);
 154       glViewport(0, 0, WIDTH, HEIGHT);
 155
 156       piglit_draw_rect(0, 0, WIDTH, HEIGHT);
 157
 158       /* lower-left corner */
 159       pass = piglit_probe_pixel_rgb(0, 0, gray25_l) && pass;
 160
 161       /* upper-right corner */
 162       pass = piglit_probe_pixel_rgb(WIDTH - 1, HEIGHT - 1, gray25_r) && pass;
 163    }
 164
 165    /* Pixel origin upper left */
 166    if (piglit_automatic || test == 3)
 167    {
 168       const char *fragtext =
 169          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 170          "layout(origin_upper_left) varying vec4 gl_FragCoord; \n"
 171          "void main(void) \n"
 172          "{ \n"
 173          "   gl_FragColor = gl_FragCoord * 0.01; \n"
 174          "   gl_FragColor.z = 0.0; \n"
 175          "} \n";
 176       int y0 = piglit_height - HEIGHT;
 177
 178       printf("Pixel origin upper left\n");
 179       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 180       prog = piglit_link_simple_program(vs, fs);
 181       glUseProgram(prog);
 182
 183       glClear(GL_COLOR_BUFFER_BIT);
 184       glViewport(0, y0, WIDTH, HEIGHT);
 185
 186       piglit_draw_rect(0, 0, WIDTH, HEIGHT);
 187
 188       /* lower-left corner */
 189       pass = piglit_probe_pixel_rgb(0, y0, green) && pass;
 190
 191       /* upper-right corner */
 192       pass = piglit_probe_pixel_rgb(WIDTH - 1, y0 + HEIGHT - 1, red) && pass;
 193    }
 194
 195    /* Pixel origin upper left and pixel center integer */
 196    if (piglit_automatic || test == 4)
 197    {
 198       static const float color1[4] = {0.125, 0.3725, 0.0, 0.0};
 199       static const float color2[4] = {0.3725, 0.125, 0.0, 0.0};
 200       const char *fragtext =
 201          "#extension GL_ARB_fragment_coord_conventions: enable \n"
 202          "layout(origin_upper_left, pixel_center_integer) varying vec4 gl_FragCoord; \n"
 203          "void main(void) \n"
 204          "{ \n"
 205          "   gl_FragColor = gl_FragCoord * 0.0025 + 0.125; \n"
 206          "   gl_FragColor.z = 0.0; \n"
 207          "} \n";
 208       int y0 = piglit_height - HEIGHT;
 209
 210       printf("Pixel origin upper left and pixel center integer\n");
 211       fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fragtext);
 212       prog = piglit_link_simple_program(vs, fs);
 213       glUseProgram(prog);
 214
 215       glClear(GL_COLOR_BUFFER_BIT);
 216       glViewport(0, y0, WIDTH, HEIGHT);
 217
 218       piglit_draw_rect(0, 0, WIDTH, HEIGHT);
 219
 220       /* lower-left corner */
 221       pass = piglit_probe_pixel_rgb(0, y0, color1) && pass;
 222
 223       /* upper-right corner */
 224       pass = piglit_probe_pixel_rgb(WIDTH - 1, y0 + HEIGHT - 1, color2) && pass;
 225    }
 226
 227    piglit_present_results();
 228
 229    return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 230 }
 231
 232 static void key_func(unsigned char key, int x, int y)
 233 {
 234    switch (key) {
 235    case 't':
 236       test = (test + 1) % 5;
 237       break;
 238    }
 239
 240    piglit_escape_exit_key(key, x, y);
 241 }
 242
 243 void piglit_init(int argc, char **argv)
 244 {
 245         piglit_require_extension("GL_ARB_fragment_coord_conventions");
 246
 247         if (!piglit_automatic) {
 248                 printf("Press t to switch between subtests.\n");
 249                 piglit_set_keyboard_func(key_func);
 250         }
 251 }