tests/spec/arb_texture_rectangle/texrect-simple.c

   1 /* Copyright © 2013 Linaro Inc
   2  *
   3  * Permission is hereby granted, free of charge, to any person obtaining a
   4  * copy of this software and associated documentation files (the "Software"),
   5  * to deal in the Software without restriction, including without limitation
   6  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7  * and/or sell copies of the Software, and to permit persons to whom the
   8  * Software is furnished to do so, subject to the following conditions:
   9  *
  10  * The above copyright notice and this permission notice (including the next
  11  * paragraph) shall be included in all copies or substantial portions of the
  12  * Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  20  * IN THE SOFTWARE.
  21  */
  22
  23 /**
  24  * Ported from glean ttexrect.cpp into piglit.
  25  * Test the ARB_texture_rectangle extension
  26  *   Create a 255x127 texture of varying colors and bind it as a
  27  *   GL_ARB_texture_recangle target.  Draw that rectangle to the window, and
  28  *   check that the texture was drawn correctly.  The common failure to be
  29  *   caught with this test is not adjusting the non-normalized coordinates on
  30  *   hardware that expects normalized coordinates.
  31  * \author: Eric Anholt <eric@anholt.net> (original)
  32  * \author: Tom Gall <tom.gall@linaro.org> (port)
  33  */
  34 #include "piglit-util-gl.h"
  35
  36 #define TEXTURE_WIDTH   255
  37 #define TEXTURE_HEIGHT  127
  38 #define WINDOW_SIZE     256
  39
  40 float image[TEXTURE_WIDTH * TEXTURE_HEIGHT * 3];
  41
  42 PIGLIT_GL_TEST_CONFIG_BEGIN
  43
  44         config.supports_gl_compat_version = 10;
  45         config.window_width = WINDOW_SIZE;
  46         config.window_height = WINDOW_SIZE;
  47         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DEPTH
  48                 | PIGLIT_GL_VISUAL_DOUBLE;
  49         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53
  54 enum piglit_result
  55 piglit_display(void)
  56 {
  57         enum piglit_result result = PIGLIT_FAIL;
  58
  59         /* Draw our texture to the window such that each texel should map
  60          * to the corresponding pixel of the window.
  61          */
  62         glClear(GL_COLOR_BUFFER_BIT);
  63
  64         piglit_draw_rect_tex(0, 0, TEXTURE_WIDTH, TEXTURE_HEIGHT,
  65                 0, 0, TEXTURE_WIDTH, TEXTURE_HEIGHT);
  66
  67         if (piglit_probe_image_rgb(0, 0, TEXTURE_WIDTH, TEXTURE_HEIGHT,
  68                 (const float *) &image))
  69                 result = PIGLIT_PASS;
  70
  71         piglit_present_results();
  72
  73         return result;
  74 }
  75
  76
  77 void
  78 piglit_init(int argc, char *argv[])
  79 {
  80         int x, y, i;
  81
  82         /* Set up a texture that it's color ramps with red to black top to
  83          * bottom and green to black left to right.
  84          */
  85         for (y = 0; y < TEXTURE_HEIGHT; y++) {
  86                 for (x = 0; x < TEXTURE_WIDTH; x++) {
  87                         i = (y * TEXTURE_WIDTH + x) * 3;
  88
  89                         image[i + 0] = (float)x / (TEXTURE_WIDTH - 1);
  90                         image[i + 1] = 1.0 - ((float)  y / (TEXTURE_HEIGHT - 1));
  91                         image[i + 2] = 0.0;
  92                 }
  93         }
  94
  95         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  96
  97         glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGB,
  98                 TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, GL_RGB, GL_FLOAT, image);
  99         glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER,
 100                 GL_NEAREST);
 101         glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER,
 102                 GL_NEAREST);
 103         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 104         glEnable(GL_TEXTURE_RECTANGLE_ARB);
 105 }