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-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 = gl_ModelViewProjectionMatrix * attrib;\n"
  58         "       gl_FrontColor = vec4(0.0, 1.0, 0.0, 1.0);\n"
  59         "} \n";
  60
  61
  62 static const GLfloat Vcoords[4][2] = { {-1, -1}, {1, -1}, {1, 1}, {-1, 1}};
  63
  64
  65 enum piglit_result
  66 piglit_display(void)
  67 {
  68         static const GLfloat expColor[4] = {0, 1, 0, 1};
  69         GLint vs;
  70         GLint prog;
  71         GLint stat;
  72         GLint attrib_loc;
  73         enum piglit_result result;
  74
  75         vs = glCreateShader(GL_VERTEX_SHADER);
  76         glShaderSource(vs, 1, &vertShaderText, NULL);
  77
  78         glCompileShader(vs);
  79         glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
  80         if (!stat) {
  81                 fprintf(stderr, "glsl-getattriblocation: error compiling vertex shader!\n");
  82                 exit(1);
  83         }
  84
  85         prog = glCreateProgram();
  86         glAttachShader(prog, vs);
  87         glLinkProgram(prog);
  88
  89         attrib_loc = glGetAttribLocation(prog, "attrib");
  90         if (!piglit_automatic)
  91                 printf("attrib_loc = %d\n", attrib_loc);
  92
  93         glUseProgram(prog);
  94
  95         glMatrixMode(GL_PROJECTION);
  96         glLoadIdentity();
  97         glOrtho(-1.1, 1.1, -1.1, 1.1, -1, 1);
  98
  99         glClear(GL_COLOR_BUFFER_BIT);
 100
 101         glVertexAttribPointer(attrib_loc, 2, GL_FLOAT, GL_FALSE, 0, Vcoords);
 102         glEnableVertexAttribArray(attrib_loc);
 103
 104         glDrawArrays(GL_POLYGON, 0, 4);
 105
 106         result = piglit_probe_pixel_rgba(20, 20, expColor)
 107                 ? PIGLIT_PASS : PIGLIT_FAIL;
 108
 109         glDisableVertexAttribArray(attrib_loc);
 110
 111         piglit_present_results();
 112
 113         return result;
 114 }
 115
 116
 117 void
 118 piglit_init(int argc, char **argv)
 119 {
 120         piglit_require_gl_version(20);
 121 }