tests/shaders/glsl-fs-user-varying-ff.c

   1 /*
   2  * Copyright © 2010 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file glsl-fs-user-varying-ff.c
  26  * Test that a fragment shader drawing with an undefined varying color
  27  * at least runs.
  28  *
  29  * \author Ian Romanick <ian.d.romanick@intel.com>
  30  */
  31 #include "piglit-util-gl.h"
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34
  35         config.supports_gl_compat_version = 10;
  36
  37         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  38
  39 PIGLIT_GL_TEST_CONFIG_END
  40
  41 static const char fs_text[] =
  42         "varying vec4 color;\n"
  43         "\n"
  44         "void main()\n"
  45         "{\n"
  46         "  gl_FragColor = color;\n"
  47         "}\n"
  48         ;
  49
  50 GLuint prog;
  51
  52 enum piglit_result
  53 piglit_display(void)
  54 {
  55         static const float green[3] = { 0.0, 1.0, 0.0 };
  56         float junk[4];
  57
  58         glClear(GL_COLOR_BUFFER_BIT);
  59
  60         glColor3fv(green);
  61         piglit_draw_rect(10, 10, 10, 10);
  62
  63         /* The result is undefined (and in particular we may find
  64          * green since so many other tests happen to load our
  65          * registers with green), but the GPU shouldn't hang.
  66          * So we read the value, but don't test it for anything.
  67          */
  68         glReadPixels(15, 15, 1, 1, GL_RGBA, GL_FLOAT, junk);
  69
  70         piglit_present_results();
  71
  72         return PIGLIT_PASS;
  73 }
  74
  75 void
  76 piglit_init(int argc, char **argv)
  77 {
  78         GLuint fs;
  79
  80         piglit_require_gl_version(20);
  81
  82         glClearColor(0.3, 0.3, 0.3, 0.0);
  83         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  84
  85         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_text);
  86
  87         prog = piglit_link_simple_program(fs, 0);
  88
  89         glDeleteShader(fs);
  90
  91         /* Don't try to render if the program failed to link, and linking
  92          * had better succeed!
  93          */
  94         if (!prog)
  95                 piglit_report_result(PIGLIT_FAIL);
  96
  97         glUseProgram(prog);
  98 }