tests/shaders/glsl-getattriblocation.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-getattriblocation.c
  27  *
  28  * Check glGetAttribLocation().
  29  *
  30  * We'd typically expect that the first user-defined vertex attribute
  31  * to wind up in location 0, but that's not guaranteed.  Check that
  32  * rendering works when there's only one user-defined vertex attribute.
  33  * If the GLSL compiler chooses a location other than zero, this might
  34  * cause a failure.
  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 = gl_ModelViewProjectionMatrix * attrib;\n"
  55         "       gl_FrontColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
  56         "} \n";
  57
  58
  59 static const GLfloat Vcoords[4][2] = { {-1, -1}, {1, -1}, {1, 1}, {-1, 1}};
  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         GLint attrib_loc;
  70         enum piglit_result result;
  71
  72         vs = glCreateShader(GL_VERTEX_SHADER);
  73         glShaderSource(vs, 1, &vertShaderText, NULL);
  74
  75         glCompileShader(vs);
  76         glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
  77         if (!stat) {
  78                 fprintf(stderr, "glsl-getattriblocation: error compiling vertex shader!\n");
  79                 exit(1);
  80         }
  81
  82         prog = glCreateProgram();
  83         glAttachShader(prog, vs);
  84         glLinkProgram(prog);
  85
  86         attrib_loc = glGetAttribLocation(prog, "attrib");
  87         if (!piglit_automatic)
  88                 printf("attrib_loc = %d\n", attrib_loc);
  89
  90         glUseProgram(prog);
  91
  92         glMatrixMode(GL_PROJECTION);
  93         glLoadIdentity();
  94         glOrtho(-1.1, 1.1, -1.1, 1.1, -1, 1);
  95
  96         glClear(GL_COLOR_BUFFER_BIT);
  97
  98         glVertexAttribPointer(attrib_loc, 2, GL_FLOAT, GL_FALSE, 0, Vcoords);
  99         glEnableVertexAttribArray(attrib_loc);
 100
 101         glDrawArrays(GL_POLYGON, 0, 4);
 102
 103         result = piglit_probe_pixel_rgba(20, 20, expColor)
 104                 ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 105
 106         glDisableVertexAttribArray(attrib_loc);
 107
 108         glutSwapBuffers();
 109
 110         return result;
 111 }
 112
 113
 114 void
 115 piglit_init(int argc, char **argv)
 116 {
 117         if (!GLEW_VERSION_2_0) {
 118                 printf("Requires OpenGL 2.0\n");
 119                 piglit_report_result(PIGLIT_SKIP);
 120                 exit(1);
 121         }
 122 }