tests/fbo/fbo-alphatest-nocolor.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 /** @file fbo-alphatest-nocolor.c
  25  *
  26  * Tests that rendering to a depth texture with no color buffer bound
  27  * and alpha testing enabled does the alpha testing correctly.
  28  */
  29
  30 #include "piglit-util-gl.h"
  31
  32 #define BUF_WIDTH 32
  33
  34 PIGLIT_GL_TEST_CONFIG_BEGIN
  35
  36         config.supports_gl_compat_version = 10;
  37
  38         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_RGBA;
  39         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  40
  41 PIGLIT_GL_TEST_CONFIG_END
  42
  43 GLuint prog;
  44
  45 static const char *vs_source =
  46         "void main() \n"
  47         "{ \n"
  48         "   gl_Position = gl_Vertex;\n"
  49         "} \n";
  50
  51 static const char *fs_source =
  52         "uniform vec4 color;\n"
  53         "void main() \n"
  54         "{ \n"
  55         "   gl_FragColor = color;\n"
  56         "} \n";
  57 static int color_location;
  58
  59 static void create_fbo(GLuint *out_tex)
  60 {
  61         GLuint tex, fb;
  62         GLenum status;
  63
  64         /* Create the depth-stencil buffer. */
  65         glGenTextures(1, &tex);
  66         glBindTexture(GL_TEXTURE_2D, tex);
  67         glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
  68                      BUF_WIDTH, BUF_WIDTH, 0,
  69                      GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
  70         if (!piglit_check_gl_error(GL_NO_ERROR))
  71                 piglit_report_result(PIGLIT_FAIL);
  72
  73         /* Create the FBO. */
  74         glGenFramebuffersEXT(1, &fb);
  75         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
  76         glDrawBuffer(GL_NONE);
  77         glReadBuffer(GL_NONE);
  78
  79         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  80                                   GL_DEPTH_ATTACHMENT_EXT,
  81                                   GL_TEXTURE_2D,
  82                                   tex,
  83                                   0);
  84
  85         status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
  86         if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
  87                 piglit_report_result(PIGLIT_SKIP);
  88         }
  89
  90         glViewport(0, 0, BUF_WIDTH, BUF_WIDTH);
  91         glEnable(GL_DEPTH_TEST);
  92         glDepthFunc(GL_ALWAYS);
  93         glClearDepth(0.0);
  94         glClear(GL_DEPTH_BUFFER_BIT);
  95
  96         if (!piglit_check_gl_error(GL_NO_ERROR))
  97                 piglit_report_result(PIGLIT_FAIL);
  98
  99         glEnable(GL_ALPHA_TEST);
 100         glAlphaFunc(GL_GREATER, 0.5f);
 101         glUseProgram(prog);
 102
 103         /* Does not draw (depth texture = 1.0) */
 104         glUniform4f(color_location, 0.0, 1.0, 0.0, 0.0);
 105         piglit_draw_rect_z(1.0,
 106                            -1.0, -1.0, 1.0, 2.0);
 107
 108         /* Draws (depth texture = 0.0). */
 109         glUniform4f(color_location, 0.0, 1.0, 0.0, 1.0);
 110         piglit_draw_rect_z(1.0,
 111                            0.0, -1.0, 1.0, 2.0);
 112
 113         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 114         glDeleteFramebuffersEXT(1, &fb);
 115
 116         glDisable(GL_ALPHA_TEST);
 117         glDisable(GL_DEPTH_TEST);
 118         glUseProgram(0);
 119
 120         *out_tex = tex;
 121 }
 122
 123 enum piglit_result piglit_display(void)
 124 {
 125         GLboolean pass = GL_TRUE;
 126         float black[] = {0, 0, 0, 0};
 127         float white[] = {1, 1, 1, 1};
 128         GLuint tex;
 129
 130         glClearColor(0.0, 1.0, 0.0, 0.0);
 131         glClear(GL_COLOR_BUFFER_BIT);
 132
 133         create_fbo(&tex);
 134
 135         glBindTexture(GL_TEXTURE_2D, tex);
 136         glViewport(0, 0, piglit_width, piglit_height);
 137
 138         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, piglit_winsys_fbo);
 139
 140         glEnable(GL_TEXTURE_2D);
 141         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 142         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 143         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 144         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 145         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 146         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
 147         glTexParameteri(GL_TEXTURE_2D, GL_DEPTH_TEXTURE_MODE, GL_INTENSITY);
 148
 149         piglit_draw_rect_tex(-1, -1, 2, 2,
 150                              0, 0, 1, 1);
 151
 152         glDisable(GL_TEXTURE_2D);
 153
 154         pass = pass && piglit_probe_rect_rgba(0, 0,
 155                                               piglit_width / 2, piglit_height,
 156                                               black);
 157         pass = pass && piglit_probe_rect_rgba(piglit_width / 2, 0,
 158                                               piglit_width / 2, piglit_height,
 159                                               white);
 160
 161         glDeleteTextures(1, &tex);
 162
 163         piglit_present_results();
 164
 165         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 166 }
 167
 168 void piglit_init(int argc, char **argv)
 169 {
 170         GLuint fs, vs;
 171
 172         piglit_require_gl_version(20);
 173
 174         piglit_require_extension("GL_EXT_framebuffer_object");
 175
 176         vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vs_source);
 177         fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, fs_source);
 178         prog = piglit_link_simple_program(vs, fs);
 179
 180         if (!prog) {
 181                 piglit_report_result(PIGLIT_SKIP);
 182         }
 183
 184         color_location = glGetUniformLocation(prog, "color");
 185         if (color_location == -1) {
 186                 fprintf(stderr, "Failed to get uniform location");
 187                 piglit_report_result(PIGLIT_FAIL);
 188         }
 189 }