tests/fast_color_clear/blit-between-clears.c

   1 /*
   2  * Copyright © 2013 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file blit-between-clears.c
  26  *
  27  * Some implementations (i965/gen7+ in particular) contain logic to
  28  * avoid performing a redundant fast color clear on a buffer that is
  29  * already in the cleared state.  This test verifies that blitting to
  30  * a buffer takes it out of the cleared state, so a subsequent fast
  31  * color clear will take effect.
  32  */
  33
  34 #include "piglit-util-gl.h"
  35
  36 #define RB_WIDTH 512
  37 #define RB_HEIGHT 512
  38
  39 PIGLIT_GL_TEST_CONFIG_BEGIN
  40         config.supports_gl_compat_version = 11;
  41         config.window_width = RB_WIDTH;
  42         config.window_height = RB_HEIGHT;
  43         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  44         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47
  48 static GLuint fb;
  49
  50
  51 void
  52 piglit_init(int argc, char **argv)
  53 {
  54         GLuint rb;
  55         GLenum fb_status;
  56
  57         /* Requirements */
  58         piglit_require_gl_version(11);
  59         piglit_require_extension("GL_ARB_framebuffer_object");
  60
  61         /* Set up framebuffer */
  62         glGenFramebuffers(1, &fb);
  63         glBindFramebuffer(GL_FRAMEBUFFER, fb);
  64         glGenRenderbuffers(1, &rb);
  65         glBindRenderbuffer(GL_RENDERBUFFER, rb);
  66         glRenderbufferStorage(GL_RENDERBUFFER, GL_RGBA,
  67                               RB_WIDTH, RB_HEIGHT);
  68         glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
  69                                   GL_RENDERBUFFER, rb);
  70         if (!piglit_check_gl_error(GL_NO_ERROR))
  71                 piglit_report_result(PIGLIT_FAIL);
  72         fb_status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
  73         if (fb_status != GL_FRAMEBUFFER_COMPLETE) {
  74                 printf("Framebuffer status: %s\n",
  75                        piglit_get_gl_enum_name(fb_status));
  76                 piglit_report_result(PIGLIT_FAIL);
  77         }
  78 }
  79
  80
  81 enum piglit_result
  82 piglit_display(void)
  83 {
  84         bool pass = true;
  85         static const GLfloat green[] = { 0.0, 1.0, 0.0, 1.0 };
  86
  87         /* Fast clear the auxiliary framebuffer to red. */
  88         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fb);
  89         glClearColor(1, 0, 0, 1);
  90         glClear(GL_COLOR_BUFFER_BIT);
  91
  92         /* Fast clear the window system framebuffer to green. */
  93         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  94         glClearColor(0, 1, 0, 1);
  95         glClear(GL_COLOR_BUFFER_BIT);
  96
  97         /* Blit the auxiliary framebuffer to the window system
  98          * framebuffer, turning it red.
  99          */
 100         glBindFramebuffer(GL_READ_FRAMEBUFFER, fb);
 101         glBlitFramebuffer(0, 0, RB_WIDTH, RB_HEIGHT,
 102                           0, 0, piglit_width, piglit_height,
 103                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 104
 105         /* Fast clear the window system framebuffer back to green. */
 106         glClear(GL_COLOR_BUFFER_BIT);
 107
 108         /* Verify that the second clear actually took effect. */
 109         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 110         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
 111                                       green) && pass;
 112
 113         if (!piglit_check_gl_error(GL_NO_ERROR))
 114                 pass = false;
 115
 116         piglit_present_results();
 117         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 118 }