tests/spec/ext_transform_feedback/discard-drawarrays.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 #include "piglit-util-gl.h"
  25
  26 /**
  27  * @file discard-drawarrays.c
  28  *
  29  * Tests that GL_RASTERIZER_DISCARD appropriately affects a basic
  30  * glDrawArrays().
  31  *
  32  * From the EXT_transform_feedback spec:
  33  *
  34  *     "Primitives can be optionally discarded before rasterization by
  35  *      calling Enable and Disable with RASTERIZER_DISCARD_EXT. When
  36  *      enabled, primitives are discarded right before the
  37  *      rasterization stage, but after the optional transform feedback
  38  *      stage. When disabled, primitives are passed through to the
  39  *      rasterization stage to be processed
  40  *      normally. RASTERIZER_DISCARD_EXT applies to the DrawPixels,
  41  *      CopyPixels, Bitmap, Clear and Accum commands as well."
  42  */
  43
  44 PIGLIT_GL_TEST_CONFIG_BEGIN
  45
  46         config.supports_gl_compat_version = 10;
  47
  48         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  49         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53 enum piglit_result
  54 piglit_display(void)
  55 {
  56         bool pass = true;
  57         float green[4] = {0.0, 1.0, 0.0, 0.0};
  58         float vertex_data[] = {
  59                 -0.5, -0.5,
  60                 0.5, -0.5,
  61                 0.0, 0.5,
  62                 0.0, 0.0
  63         };
  64
  65         glDisable(GL_RASTERIZER_DISCARD);
  66         glColor4f(0.0, 1.0, 0.0, 0.0);
  67         piglit_draw_rect(-1, -1, 2, 2);
  68
  69         glEnable(GL_RASTERIZER_DISCARD);
  70         glColor4f(1.0, 0.0, 0.0, 0.0);
  71         piglit_draw_rect(-1, -1, 2, 2);
  72         glVertexPointer(2, GL_FLOAT, 0, vertex_data);
  73         glEnableClientState(GL_VERTEX_ARRAY);
  74         glDrawArrays(GL_LINE_LOOP, 0, 3);
  75         glDrawArrays(GL_POINTS, 3, 1);
  76
  77         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
  78
  79         piglit_present_results();
  80
  81         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  82 }
  83
  84 void
  85 piglit_init(int argc, char **argv)
  86 {
  87         piglit_require_transform_feedback();
  88 }