tests/shaders/glsl-unused-varying.c

   1 /*
   2  * Copyright © 2009 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  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file glsl-unused-varying.c
  29  *
  30  * Tests that a vertex/fragment program combination with a varying that's
  31  * unused gets the right varying contents for the one that is used.
  32  *
  33  * This reveals a bug in the 965 brw_wm_glsl.c code.  Note that the
  34  * conditional in the fragment shader is required to trigger brw_wm_glsl.c.
  35  */
  36
  37 #include "piglit-util.h"
  38
  39 int piglit_width = 100, piglit_height = 100;
  40 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  41
  42 static int do_red_location;
  43 static int red_location;
  44 static int green_location;
  45 static GLint prog;
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         static const float red[] = {1.0, 0.0, 0.0, 0.0};
  51         static const float green[] = {0.0, 1.0, 0.0, 0.0};
  52         GLboolean pass = GL_TRUE;
  53
  54         glClearColor(0.5, 0.5, 0.5, 0.5);
  55         glClear(GL_COLOR_BUFFER_BIT);
  56
  57         glUniform4fv(red_location, 1, red);
  58         glUniform4fv(green_location, 1, green);
  59
  60         glUniform1i(do_red_location, 1);
  61         piglit_draw_rect(10, 10, 10, 10);
  62
  63         glUniform1i(do_red_location, 0);
  64         piglit_draw_rect(10, 30, 10, 10);
  65
  66         pass &= piglit_probe_pixel_rgb(15, 15, red);
  67         pass &= piglit_probe_pixel_rgb(15, 35, green);
  68
  69         glutSwapBuffers();
  70
  71         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  72 }
  73
  74 void piglit_init(int argc, char **argv)
  75 {
  76         GLint vs, fs;
  77
  78         if (!GLEW_VERSION_2_0) {
  79                 printf("Requires OpenGL 2.0\n");
  80                 piglit_report_result(PIGLIT_SKIP);
  81         }
  82
  83         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  84
  85         vs = piglit_compile_shader(GL_VERTEX_SHADER,
  86                                    "shaders/glsl-unused-varying.vert");
  87         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
  88                                    "shaders/glsl-unused-varying.frag");
  89
  90         prog = piglit_link_simple_program(vs, fs);
  91
  92         glUseProgram(prog);
  93
  94         red_location = glGetUniformLocation(prog, "red");
  95         green_location = glGetUniformLocation(prog, "green");
  96         do_red_location = glGetUniformLocation(prog, "do_red");
  97 }