tests/shaders/glsl-uniform-update.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-uniform-update.c
  29  *
  30  * Tests that updates to uniforms between drawing calls get respected.
  31  *
  32  * Create a simple shader that passes through vertex data, and uses a uniform
  33  * to set a color, and just updates that uniform between draw calls.  This
  34  * catches a bug found in the 965 driver in an app I was writing.
  35  */
  36
  37 #include "piglit-util-gl.h"
  38
  39 PIGLIT_GL_TEST_CONFIG_BEGIN
  40
  41         config.supports_gl_compat_version = 10;
  42
  43         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 static int color_location;
  48 static GLint prog;
  49
  50 enum piglit_result
  51 piglit_display(void)
  52 {
  53         GLboolean pass = GL_TRUE;
  54
  55         static const float red[] = {1.0, 0.0, 0.0, 0.0};
  56         static const float blue[] = {0.0, 1.0, 0.0, 0.0};
  57
  58         glClearColor(0.5, 0.5, 0.5, 0.5);
  59         glClear(GL_COLOR_BUFFER_BIT);
  60
  61         glUniform4fv(color_location, 1, red);
  62         piglit_draw_rect(20, 20, 20, 20);
  63
  64         glUniform4fv(color_location, 1, blue);
  65         piglit_draw_rect(50, 20, 20, 20);
  66
  67         pass &= piglit_probe_pixel_rgb(30, 30, red);
  68         pass &= piglit_probe_pixel_rgb(60, 30, blue);
  69
  70         piglit_present_results();
  71
  72         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  73 }
  74
  75 void
  76 piglit_init(int argc, char **argv)
  77 {
  78         GLint vs, fs;
  79
  80         piglit_require_gl_version(20);
  81
  82         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  83
  84         vs = piglit_compile_shader(GL_VERTEX_SHADER,
  85                                    "shaders/glsl-mvp.vert");
  86         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
  87                                    "shaders/glsl-uniform-update.frag");
  88
  89         prog = piglit_link_simple_program(vs, fs);
  90
  91         glUseProgram(prog);
  92
  93         color_location = glGetUniformLocation(prog, "color");
  94 }