tests/spec/arb_map_buffer_alignment/map-invalidate-range.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 DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file map-invalidate-range.c
  26  * Try to exercise some corner cases of range mapping with alignment guarantees.
  27  *
  28  * Under certain circumstances, many OpenGL implementations will
  29  * allocate temporary storage for a mapping of a buffer object.  This
  30  * most commonly occurs when:
  31  *
  32  * 1. The buffer being mapped is being accessed by the GPU.
  33  * 2. The buffer is being mapped write-only.
  34  * 3. The range is mapped with invalidate (via \c GL_MAP_INVALIDATE_RANGE_BIT).
  35  *
  36  * Furthermore, at least some driver make different choices about the
  37  * allocation of the temporary storage depending on whether or not
  38  * explicit flushed (via \c GL_MAP_FLUSH_EXPLICIT_BIT) is requested.
  39  *
  40  * This test tries to make sure the temporary storage allocated for
  41  * the mapping still provides the alignment guarantees required by
  42  * GL_ARB_map_buffer_alignment.  This is accomplished by starting some
  43  * rendering that will use the entire buffer then immediately trying
  44  * to map some portion of the buffer.
  45  */
  46 #include "piglit-util-gl.h"
  47
  48 PIGLIT_GL_TEST_CONFIG_BEGIN
  49
  50         config.supports_gl_compat_version = 15;
  51
  52         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  53         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  54
  55 PIGLIT_GL_TEST_CONFIG_END
  56
  57 static bool
  58 do_test(uint8_t *vertex_data, unsigned num_verts, int buf_size, int map_size,
  59         int alignment, GLbitfield access)
  60 {
  61         bool pass = true;
  62         int offset;
  63
  64         for (offset = 0; offset < (buf_size - map_size); offset++) {
  65                 void *ptr;
  66                 uintptr_t mapping;
  67
  68                 glDrawArrays(GL_POINTS, 0, num_verts);
  69                 glDrawArrays(GL_POINTS, 0, num_verts);
  70                 glDrawArrays(GL_POINTS, 0, num_verts);
  71                 glDrawArrays(GL_POINTS, 0, num_verts);
  72                 glDrawArrays(GL_POINTS, 0, num_verts);
  73                 glFlush();
  74
  75                 ptr = glMapBufferRange(GL_ARRAY_BUFFER,
  76                                        offset,
  77                                        map_size,
  78                                        access);
  79
  80                 mapping = (uintptr_t) ptr;
  81                 if ((mapping - offset) % alignment != 0) {
  82                         printf("Bad mapping for offset = %d, alignment = %d: "
  83                                "%p\n",
  84                                offset, alignment, ptr);
  85                         pass = false;
  86                 }
  87
  88                 /* Invalidate throws away our data, so we have to restore the
  89                  * values.
  90                  */
  91                 memcpy(ptr, vertex_data + offset, map_size);
  92
  93                 glUnmapBuffer(GL_ARRAY_BUFFER);
  94         }
  95
  96         return pass;
  97 }
  98
  99 void
 100 piglit_init(int argc, char *argv[])
 101 {
 102         GLuint bo;
 103         int alignment = 0;
 104         int buf_size;
 105         int map_size;
 106         bool pass = true;
 107         uint8_t *vertex_data;
 108         unsigned num_verts;
 109
 110         piglit_require_extension("GL_ARB_map_buffer_range");
 111         piglit_require_extension("GL_ARB_map_buffer_alignment");
 112
 113         glGetIntegerv(GL_MIN_MAP_BUFFER_ALIGNMENT, &alignment);
 114
 115         buf_size = MAX2(10 * alignment, 4096);
 116         map_size = alignment - 1;
 117
 118         vertex_data = calloc(1, buf_size);
 119
 120         glGenBuffers(1, &bo);
 121         glBindBuffer(GL_ARRAY_BUFFER, bo);
 122         glBufferData(GL_ARRAY_BUFFER, buf_size, vertex_data, GL_STATIC_DRAW);
 123
 124         glVertexPointer(2, GL_FLOAT, 0, 0);
 125         glEnableClientState(GL_VERTEX_ARRAY);
 126         num_verts = buf_size / (2 * sizeof(float));
 127
 128         pass = do_test(vertex_data, num_verts, buf_size, map_size, alignment,
 129                        GL_MAP_WRITE_BIT
 130                        | GL_MAP_INVALIDATE_RANGE_BIT)
 131                 && pass;
 132
 133         pass = do_test(vertex_data, num_verts, buf_size, map_size, alignment,
 134                        GL_MAP_WRITE_BIT
 135                        | GL_MAP_INVALIDATE_RANGE_BIT
 136                        | GL_MAP_FLUSH_EXPLICIT_BIT)
 137                 && pass;
 138
 139         free(vertex_data);
 140         glBindBuffer(GL_ARRAY_BUFFER, 0);
 141         glDeleteBuffers(1, &bo);
 142
 143         piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
 144 }
 145
 146 enum piglit_result
 147 piglit_display(void)
 148 {
 149         /* UNREACHED */
 150         return PIGLIT_FAIL;
 151 }