tests/shaders/glsl-fs-color-matrix.c

   1 /*
   2  * Copyright © 2011 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 DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file glsl-fs-color-matrix.c
  26  * Transform the color value read from a texture by a matrix, keeping its alpha
  27  *
  28  * The shader in this test is fairly terrible (calling texture2D twice with
  29  * the same texture coordinate), but it reproduces a bug in the Mesa i915
  30  * driver.  See Meego bug #13005 (https://bugs.meego.com/show_bug.cgi?id=13005).
  31  */
  32 #include "piglit-util-gl.h"
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 10;
  37
  38         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  39
  40 PIGLIT_GL_TEST_CONFIG_END
  41
  42 const char *vs_text =
  43         "attribute vec4 vertex;\n"
  44         "attribute vec2 textureCoord;\n"
  45         "varying   vec2 coord;\n"
  46         "void main(void)\n"
  47         "{\n"
  48         "  gl_Position = vertex;\n"
  49         "  coord = textureCoord;\n"
  50         "}\n";
  51
  52 const char *fs_text =
  53         "uniform sampler2D  texture;\n"
  54         "uniform mat4 colorMatrix;\n"
  55         "varying vec2 coord;\n"
  56         "void main(void)\n"
  57         "{\n"
  58         "  vec4 color = vec4(texture2D(texture, coord.st).rgb, 1.0);\n"
  59         "  color = colorMatrix * color;\n"
  60         "  gl_FragColor = vec4(color.rgb, texture2D(texture, coord.st).a);\n"
  61         "}\n";
  62
  63 static const GLfloat identity_matrix[] = {
  64         0.0, 0.0, 1.0, 0.0,
  65         1.0, 0.0, 0.0, 0.0,
  66         0.0, 1.0, 0.0, 0.0,
  67         0.0, 0.0, 0.0, 1.0,
  68 };
  69
  70 static const GLfloat vertex[] = {
  71         -1.0, -1.0,
  72         +1.0, -1.0,
  73         +1.0,  1.0,
  74         -1.0,  1.0,
  75 };
  76
  77 static const GLfloat tex_coord[] = {
  78         0.0, 0.0,
  79         1.0, 0.0,
  80         1.0, 1.0,
  81         0.0, 1.0,
  82 };
  83
  84 static const GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
  85 static const GLfloat red[4]   = { 1.0, 0.0, 0.0, 1.0 };
  86 static const GLfloat green[4] = { 0.0, 1.0, 0.0, 1.0 };
  87 static const GLfloat blue[4]  = { 0.0, 0.0, 1.0, 1.0 };
  88
  89 static GLint prog;
  90
  91 enum piglit_result
  92 piglit_display(void)
  93 {
  94         GLboolean pass = GL_TRUE;
  95         GLuint tex;
  96
  97         tex = piglit_rgbw_texture(GL_RGBA8, 64, 64, GL_FALSE, GL_TRUE,
  98                                   GL_UNSIGNED_NORMALIZED);
  99
 100         glClear(GL_COLOR_BUFFER_BIT);
 101         glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 102
 103         pass = piglit_probe_pixel_rgb(1 * piglit_width / 3,
 104                                       1 * piglit_width / 3,
 105                                       blue);
 106         pass = piglit_probe_pixel_rgb(2 * piglit_width / 3,
 107                                       1 * piglit_width / 3,
 108                                       red)
 109                 && pass;
 110         pass = piglit_probe_pixel_rgb(1 * piglit_width / 3,
 111                                       2 * piglit_width / 3,
 112                                       green)
 113                 && pass;
 114         pass = piglit_probe_pixel_rgb(2 * piglit_width / 3,
 115                                       2 * piglit_width / 3,
 116                                       white)
 117                 && pass;
 118
 119         piglit_present_results();
 120
 121         glDeleteTextures(1, &tex);
 122
 123         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 124 }
 125
 126 void
 127 piglit_init(int argc, char **argv)
 128 {
 129         GLuint vs;
 130         GLuint fs;
 131         GLint loc;
 132         GLboolean ok;
 133
 134         piglit_require_GLSL();
 135
 136         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_text);
 137         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_text);
 138         prog = piglit_link_simple_program(vs, fs);
 139
 140         glBindAttribLocation(prog, 0, "vertex");
 141         glBindAttribLocation(prog, 1, "textureCoord");
 142
 143         glLinkProgram(prog);
 144         ok = piglit_link_check_status(prog);
 145         if (!ok)
 146                 piglit_report_result(PIGLIT_FAIL);
 147
 148         glUseProgram(prog);
 149
 150         loc = glGetUniformLocation(prog, "colorMatrix");
 151         glUniformMatrix4fv(loc, 1, GL_FALSE, identity_matrix);
 152
 153         loc = glGetUniformLocation(prog, "texture");
 154         glUniform1i(loc, 0);
 155
 156         glClearColor(0.2, 0.2, 0.2, 1.0);
 157
 158         glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE,
 159                                    2 * sizeof(GLfloat), vertex);
 160         glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE,
 161                                    2 * sizeof(GLfloat), tex_coord);
 162
 163         glEnableVertexAttribArray(0);
 164         glEnableVertexAttribArray(1);
 165 }