tests/shaders/glsl-fs-texture2drect.c

   1 /*
   2  * Copyright © 2010 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  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file glsl-fs-texture2drect.c
  29  *
  30  * Tests that we can access rectangular textures in the fragment shader.
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 10;
  38
  39         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 static GLint prog;
  44 float red[4]   = {1.0, 0.0, 0.0, 1.0};
  45 float green[4] = {0.0, 1.0, 0.0, 1.0};
  46 float blue[4]  = {0.0, 0.0, 1.0, 1.0};
  47 float white[4] = {1.0, 1.0, 1.0, 1.0};
  48 GLboolean proj3 = GL_FALSE, proj4 = GL_FALSE;
  49
  50 GLuint
  51 rgbw_texture(GLenum format, int w, int h)
  52 {
  53         GLfloat *data;
  54         int x, y;
  55         GLuint tex;
  56
  57         glGenTextures(1, &tex);
  58         glBindTexture(GL_TEXTURE_RECTANGLE, tex);
  59         glTexParameteri(GL_TEXTURE_RECTANGLE,
  60                         GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  61         glTexParameteri(GL_TEXTURE_RECTANGLE,
  62                         GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  63         glTexParameteri(GL_TEXTURE_RECTANGLE,
  64                         GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  65         glTexParameteri(GL_TEXTURE_RECTANGLE,
  66                         GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  67
  68         data = malloc(w * h * 4 * sizeof(GLfloat));
  69
  70         for (y = 0; y < h; y++) {
  71                 for (x = 0; x < w; x++) {
  72                         const float *color;
  73
  74                         if (x < w / 2 && y < h / 2)
  75                                 color = red;
  76                         else if (y < h / 2)
  77                                 color = green;
  78                         else if (x < w / 2)
  79                                 color = blue;
  80                         else
  81                                 color = white;
  82
  83                         memcpy(data + (y * w + x) * 4, color,
  84                                4 * sizeof(float));
  85                 }
  86         }
  87         glTexImage2D(GL_TEXTURE_RECTANGLE, 0,
  88                      format,
  89                      w, h, 0,
  90                      GL_RGBA, GL_FLOAT, data);
  91
  92         free(data);
  93         return tex;
  94 }
  95
  96 enum piglit_result
  97 piglit_display(void)
  98 {
  99         GLboolean pass = GL_TRUE;
 100         GLuint tex;
 101         int tx1 = piglit_width * 1 / 4;
 102         int tx2 = piglit_width * 3 / 4;
 103         int ty1 = piglit_height * 1 / 4;
 104         int ty2 = piglit_height * 3 / 4;
 105         float proj;
 106
 107         /* Create the texture. */
 108         tex = rgbw_texture(GL_RGBA, 50, 25);
 109
 110         glEnable(GL_TEXTURE_RECTANGLE);
 111
 112         if (proj3 || proj4)
 113                 proj = 2.0;
 114         else
 115                 proj = 1.0;
 116
 117         piglit_draw_rect_tex(-1, -1, 2, 2,
 118                              0, 0, 50 * proj, 25 * proj);
 119
 120         pass = pass && piglit_probe_pixel_rgb(tx1, ty1, red);
 121         pass = pass && piglit_probe_pixel_rgb(tx2, ty1, green);
 122         pass = pass && piglit_probe_pixel_rgb(tx1, ty2, blue);
 123         pass = pass && piglit_probe_pixel_rgb(tx2, ty2, white);
 124
 125         glDeleteTextures(1, &tex);
 126
 127         piglit_present_results();
 128
 129         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 130 }
 131
 132 void piglit_init(int argc, char **argv)
 133 {
 134         GLint vs, fs;
 135         int loc;
 136         char *fs_name;
 137         int i = 0;
 138
 139         for (i = 0; i < argc; i++) {
 140                 if (!strcmp(argv[i], "-proj3"))
 141                         proj3 = GL_TRUE;
 142                 if (!strcmp(argv[i], "-proj4"))
 143                         proj4 = GL_TRUE;
 144         }
 145
 146         piglit_require_gl_version(20);
 147         piglit_require_extension("GL_ARB_texture_rectangle");
 148
 149         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 150                                    "shaders/glsl-tex-mvp.vert");
 151         if (proj4) {
 152                 fs_name = "shaders/glsl-fs-texture2drect-proj4.frag";
 153         } else if (proj3) {
 154                 fs_name = "shaders/glsl-fs-texture2drect-proj3.frag";
 155         } else {
 156                 fs_name = "shaders/glsl-fs-texture2drect.frag";
 157         }
 158         fs = piglit_compile_shader(GL_FRAGMENT_SHADER, fs_name);
 159
 160         prog = piglit_link_simple_program(vs, fs);
 161         if (!piglit_link_check_status(prog))
 162                 piglit_report_result(PIGLIT_FAIL);
 163
 164         glUseProgram(prog);
 165
 166         loc = glGetUniformLocation(prog, "sampler");
 167         glUniform1i(loc, 0);
 168 }