tests/shaders/vp-ignore-input.c

   1 /*
   2  * Copyright © 2009 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 // author: Ben Holmes
  25
  26 /*
  27  * draws using a vertex program that ignores inputs and instead just
  28  * writes a constant to gl_Position.
  29  */
  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_width = 400;
  38         config.window_height = 300;
  39         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 static GLint prog;
  44 static GLint fs;
  45 static GLint vs;
  46
  47
  48 static GLfloat vertices[12] = {150.0, 125.0, 0.0,
  49                                 150.0, 175.0, 0.0,
  50                                 100.0, 125.0, 0.0,
  51                                 100.0, 175.0, 0.0};
  52
  53 static const char *vertShaderText =
  54         "void main()\n"
  55         "{ \n"
  56         "       gl_Position = vec4(100, 50, 0, 0);\n"
  57         "} \n";
  58
  59 static const char *fragShaderText =
  60         "void main()\n"
  61         "{ \n"
  62         "       gl_FragColor = vec4(0.0, 1.0, 1.0, 1.0);\n"
  63         "} \n";
  64
  65 static void compileLinkProg(void);
  66
  67 void
  68 piglit_init(int argc, char **argv)
  69 {
  70         glMatrixMode(GL_PROJECTION);
  71         glPushMatrix();
  72         glLoadIdentity();
  73         glOrtho(0, 400, 0, 300, -1, 1);
  74
  75         glMatrixMode(GL_MODELVIEW);
  76         glPushMatrix();
  77         glLoadIdentity();
  78
  79         glClearColor(0.2, 0.2, 0.2, 1.0);
  80
  81         piglit_require_gl_version(20);
  82
  83         compileLinkProg();
  84 }
  85
  86 static void
  87 compileLinkProg(void)
  88 {
  89         GLint stat;
  90
  91         vs = glCreateShader(GL_VERTEX_SHADER);
  92         fs = glCreateShader(GL_FRAGMENT_SHADER);
  93         glShaderSource(vs, 1, (const GLchar **) &vertShaderText, NULL);
  94         glShaderSource(fs, 1, (const GLchar **) &fragShaderText, NULL);
  95         glCompileShader(vs);
  96         glGetShaderiv(vs, GL_COMPILE_STATUS, &stat);
  97         if (!stat) {
  98                 printf("error compiling vertex shader!\n");
  99                 exit(1);
 100         }
 101         glCompileShader(fs);
 102         glGetShaderiv(fs, GL_COMPILE_STATUS, &stat);
 103         if (!stat) {
 104                 printf("error compiling fragment shader!\n");
 105                 exit(1);
 106         }
 107
 108         prog = glCreateProgram();
 109         glAttachShader(prog, vs);
 110         glAttachShader(prog, fs);
 111         glLinkProgram(prog);
 112         glUseProgram(prog);
 113
 114         glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(GLfloat),
 115                                 vertices);
 116
 117         glEnableVertexAttribArray(0);
 118 }
 119
 120
 121 enum piglit_result
 122 piglit_display(void)
 123 {
 124         glClear(GL_COLOR_BUFFER_BIT);
 125
 126         glDrawArrays(GL_POINTS, 0, 4);
 127
 128         glPushMatrix();
 129         glTranslatef(75.0, 0.0, 0.0);
 130
 131         glDrawArrays(GL_POINTS, 0, 4);
 132
 133         glPopMatrix();
 134
 135         glFinish();
 136         piglit_present_results();
 137
 138         return PIGLIT_PASS;
 139 }