tests/shaders/glsl-novertexdata.c

   1 /*
   2  * Copyright © 2009 Intel Corporation
   3  * Copyright © 2010 VMware, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file glsl-novertexdata.c
  27  *
  28  * Test if we can draw something without specifying/enabling any vertex
  29  * arrays.  The vertex shader simply sets gl_Position=(0,0,0,1) and we
  30  * try to draw a GL_POINT.
  31  *
  32  * This is an obscure case, but it works with NVIDIA's OpenGL driver,
  33  * works with Mesa/swrast, but Mesa/gallium fails (at the time of
  34  * writing this).
  35  *
  36  * This test is based on the glsl-dlist-getattriblocation.c test written
  37  * by Ian.
  38  *
  39  * \author Ian Romanick <ian.d.romanick@intel.com>
  40  * \author Brian Paul
  41  */
  42
  43 #include "piglit-util-gl.h"
  44
  45 PIGLIT_GL_TEST_CONFIG_BEGIN
  46
  47         config.supports_gl_compat_version = 10;
  48
  49         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53 static const GLchar *vertShaderText =
  54         "attribute vec4 attrib;\n"
  55         "void main()\n"
  56         "{\n"
  57         "       gl_Position = vec4(0.0, 0.0, 0.0, 1.0);\n"
  58         "       gl_FrontColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
  59         "} \n";
  60
  61
  62 enum piglit_result
  63 piglit_display(void)
  64 {
  65         static const GLfloat expColor[4] = {0, 1, 0, 1};
  66         GLint vs;
  67         GLint prog;
  68         GLint stat;
  69         enum piglit_result result;
  70
  71         vs = glCreateShader(GL_VERTEX_SHADER);
  72         glShaderSource(vs, 1, &vertShaderText, NULL);
  73
  74         glCompileShader(vs);
  75         glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
  76         if (!stat) {
  77                 printf("glsl-novertexdata:  error compiling vertex shader!\n");
  78                 exit(1);
  79         }
  80
  81         prog = glCreateProgram();
  82         glAttachShader(prog, vs);
  83         glLinkProgram(prog);
  84         glUseProgram(prog);
  85
  86         glMatrixMode(GL_PROJECTION);
  87         glLoadIdentity();
  88         glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
  89
  90         glClear(GL_COLOR_BUFFER_BIT);
  91
  92         glPointSize(20.0);
  93         glDrawArrays(GL_POINTS, 0, 1);
  94
  95         result = piglit_probe_pixel_rgba(piglit_width /2, piglit_height / 2,
  96                                          expColor)
  97                 ? PIGLIT_PASS : PIGLIT_FAIL;
  98
  99         piglit_present_results();
 100
 101         return result;
 102 }
 103
 104
 105 void
 106 piglit_init(int argc, char **argv)
 107 {
 108         piglit_require_gl_version(20);
 109 }