tests/fbo/fbo-fragcoord.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
  24 /** @file glsl-fs-fragcoord.c
  25  *
  26  * Tests that gl_FragCoord produces the expected output in a fragment shader.
  27  */
  28
  29 #include "piglit-util-gl.h"
  30
  31 #define WIDTH 256
  32 #define HEIGHT 256
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 10;
  37
  38         config.window_width = WIDTH;
  39         config.window_height = HEIGHT;
  40         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  41         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  42
  43 PIGLIT_GL_TEST_CONFIG_END
  44
  45 static GLint prog;
  46
  47 static int
  48 create_fbo(unsigned width, unsigned height, GLuint *out_tex)
  49 {
  50         GLuint tex;
  51         GLuint fb;
  52         GLenum status;
  53         GLenum internal_format = GL_RGBA;
  54
  55         glGenTextures(1, &tex);
  56         glBindTexture(GL_TEXTURE_2D, tex);
  57         glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height,
  58                      0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
  59         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  60         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
  61         if (!piglit_check_gl_error(GL_NO_ERROR))
  62                 piglit_report_result(PIGLIT_FAIL);
  63
  64         glGenFramebuffersEXT(1, &fb);
  65         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  66         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
  67                                   GL_TEXTURE_2D, tex, 0);
  68         if (!piglit_check_gl_error(GL_NO_ERROR))
  69                 piglit_report_result(PIGLIT_FAIL);
  70
  71         status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
  72         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  73                 if (status == GL_FRAMEBUFFER_UNSUPPORTED_EXT)
  74                         printf("FBO with 0x%04x texture is unsupported\n",
  75                                internal_format);
  76                 else
  77                         fprintf(stderr, "FBO with 0x%04x texture is incomplete"
  78                                 " (0x%04x)\n",
  79                                 internal_format, status);
  80
  81                 glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
  82                 glDeleteFramebuffersEXT(1, &fb);
  83                 glDeleteTextures(1, &tex);
  84                 piglit_report_result((status == GL_FRAMEBUFFER_UNSUPPORTED_EXT)
  85                                      ? PIGLIT_SKIP : PIGLIT_FAIL);
  86         }
  87
  88         *out_tex = tex;
  89         return fb;
  90 }
  91
  92 enum piglit_result
  93 piglit_display(void)
  94 {
  95         int x, y;
  96         GLuint fb, tex;
  97
  98         /* Draw the shader to the fbo. */
  99         fb = create_fbo(WIDTH, HEIGHT, &tex);
 100         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
 101         glViewport(0, 0, WIDTH, HEIGHT);
 102
 103         glClearColor(1.0, 0.0, 0.0, 0.0);
 104         glClear(GL_COLOR_BUFFER_BIT);
 105
 106         glUseProgram(prog);
 107         piglit_draw_rect(-1, -1, 2, 2);
 108
 109         /* Draw the FBO to the screen. */
 110         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 111         glViewport(0, 0, piglit_width, piglit_height);
 112
 113         glClearColor(0.0, 0.0, 1.0, 0.0);
 114         glClear(GL_COLOR_BUFFER_BIT);
 115
 116         glBindTexture(GL_TEXTURE_2D, tex);
 117         glEnable(GL_TEXTURE_2D);
 118         glUseProgram(0);
 119         piglit_draw_rect_tex(-1, -1, 2, 2,
 120                              0, 0, 1, 1);
 121
 122         glDisable(GL_TEXTURE_2D);
 123         glDeleteTextures(1, &tex);
 124         glDeleteFramebuffersEXT(1, &fb);
 125
 126         if (!piglit_check_gl_error(GL_NO_ERROR))
 127                 piglit_report_result(PIGLIT_FAIL);
 128
 129         float *color = malloc(piglit_width * piglit_height * 3 * sizeof(float));
 130
 131         for (y = 0; y < piglit_height; y++) {
 132                 for (x = 0; x < piglit_width; x++) {
 133                         color[(y * piglit_width + x) * 3 + 0] = x / 256.0;
 134                         color[(y * piglit_width + x) * 3 + 1] = y / 256.0;
 135                         color[(y * piglit_width + x) * 3 + 2] = 0;
 136                 }
 137         }
 138
 139         bool pass = piglit_probe_image_rgb(0, 0, piglit_width, piglit_height, color);
 140
 141         free(color);
 142
 143         piglit_present_results();
 144
 145         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 146 }
 147
 148 void
 149 piglit_init(int argc, char **argv)
 150 {
 151         GLint vs, fs;
 152
 153         piglit_require_gl_version(20);
 154         piglit_require_extension("GL_EXT_framebuffer_object");
 155
 156         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 157                                    "shaders/glsl-mvp.vert");
 158         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
 159                                    "shaders/glsl-fs-fragcoord.frag");
 160
 161         prog = piglit_link_simple_program(vs, fs);
 162 }