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.h"
  44 #include "piglit-framework.h"
  45
  46 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE;
  47 int piglit_width = 100;
  48 int piglit_height = 100;
  49
  50 static const GLchar *vertShaderText =
  51         "attribute vec4 attrib;\n"
  52         "void main()\n"
  53         "{\n"
  54         "       gl_Position = vec4(0.0, 0.0, 0.0, 1.0);\n"
  55         "       gl_FrontColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
  56         "} \n";
  57
  58
  59 enum piglit_result
  60 piglit_display(void)
  61 {
  62         static const GLfloat expColor[4] = {0, 1, 0, 1};
  63         GLint vs;
  64         GLint prog;
  65         GLint stat;
  66         enum piglit_result result;
  67
  68         vs = glCreateShader(GL_VERTEX_SHADER);
  69         glShaderSource(vs, 1, &vertShaderText, NULL);
  70
  71         glCompileShader(vs);
  72         glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
  73         if (!stat) {
  74                 printf("glsl-novertexdata:  error compiling vertex shader!\n");
  75                 exit(1);
  76         }
  77
  78         prog = glCreateProgram();
  79         glAttachShader(prog, vs);
  80         glLinkProgram(prog);
  81         glUseProgram(prog);
  82
  83         glMatrixMode(GL_PROJECTION);
  84         glLoadIdentity();
  85         glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
  86
  87         glClear(GL_COLOR_BUFFER_BIT);
  88
  89         glPointSize(20.0);
  90         glDrawArrays(GL_POINTS, 0, 1);
  91
  92         result = piglit_probe_pixel_rgba(piglit_width /2, piglit_height / 2,
  93                                          expColor)
  94                 ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  95
  96         glutSwapBuffers();
  97
  98         return result;
  99 }
 100
 101
 102 void
 103 piglit_init(int argc, char **argv)
 104 {
 105         if (!GLEW_VERSION_2_0) {
 106                 printf("Requires OpenGL 2.0\n");
 107                 piglit_report_result(PIGLIT_SKIP);
 108                 exit(1);
 109         }
 110 }