tests/glx/glx-multi-context-ib-1.c

   1 /*
   2  * Copyright © 2009-2011 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 glx-multi-context-ib.c
  25  *
  26  * Tests that multiple contexts drawing using index buffers work correctly.
  27  *
  28  * Catches a bug in the i965 driver in which index buffer state was
  29  * not reemitted across batchbuffer boundaries, if the first draw
  30  * after the batch didn't use the IB.
  31  */
  32
  33 #include <unistd.h>
  34 #include "piglit-util-gl.h"
  35 #include "piglit-glx-util.h"
  36
  37 int piglit_width = 50, piglit_height = 50;
  38 static Display *dpy;
  39 static Window win;
  40 static GLXContext ctx0, ctx1;
  41
  42 GLuint vb_c0, vb_c1, ib_c0, ib_c1;
  43 static float green[] = {0, 1, 0, 0};
  44 static float red[]   = {1, 0, 0, 0};
  45
  46 /* c0 sets up an IB that will mess up c1's drawing, by only indexing
  47  * outside of c0's VBO.
  48  */
  49 static void
  50 context0_init()
  51 {
  52         float vb_data[] = {
  53                 0, 0,
  54                 0, 0,
  55                 0, 0,
  56                 0, 0,
  57                 -1, -1,
  58                  1, -1,
  59                  1,  1,
  60                 -1,  1,
  61         };
  62         uint32_t ib_data[] = {
  63                 4, 5, 6, 7,
  64         };
  65
  66         glGenBuffersARB(1, &vb_c0);
  67         glGenBuffersARB(1, &ib_c0);
  68         glBindBufferARB(GL_ARRAY_BUFFER_ARB, vb_c0);
  69         glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, ib_c0);
  70
  71         glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(vb_data), vb_data,
  72                         GL_STATIC_DRAW);
  73         glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(ib_data), ib_data,
  74                         GL_STATIC_DRAW);
  75 }
  76
  77 static void
  78 context1_init()
  79 {
  80         float vb_data[] = {
  81                 -1, -1,
  82                  1, -1,
  83                  1,  1,
  84                 -1,  1,
  85         };
  86         uint32_t ib_data[] = {
  87                 0, 1, 2, 3,
  88         };
  89
  90         glGenBuffersARB(1, &vb_c1);
  91         glGenBuffersARB(1, &ib_c1);
  92         glBindBufferARB(GL_ARRAY_BUFFER_ARB, vb_c1);
  93         glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, ib_c1);
  94
  95         glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(vb_data), vb_data,
  96                         GL_STATIC_DRAW);
  97         glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(ib_data), ib_data,
  98                         GL_STATIC_DRAW);
  99 }
 100
 101 static void
 102 context0_frame(void)
 103 {
 104         glXMakeCurrent(dpy, win, ctx0);
 105
 106         glColor4fv(red);
 107
 108         glBindBufferARB(GL_ARRAY_BUFFER_ARB, vb_c0);
 109         glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, ib_c0);
 110         glEnableClientState(GL_VERTEX_ARRAY);
 111         glVertexPointer(2, GL_FLOAT, 0, (void *)0);
 112
 113         glDrawElements(GL_TRIANGLE_FAN, 4, GL_UNSIGNED_INT, (void *)0);
 114 }
 115
 116 static void
 117 context1_frame(int iter)
 118 {
 119         glXMakeCurrent(dpy, win, ctx1);
 120
 121         /* This is the drawing without an IB that triggered the driver
 122          * not reemitting IB state in the next draw call.
 123          *
 124          * The other context just exists to ensure that the race for
 125          * the IB getting smashed is lost, and is also the thing that
 126          * produces the glFlush()-based batchbuffer emits we rely on.
 127          */
 128         glColor4fv(red);
 129         glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 130
 131         /* Failing draw call. */
 132         if (iter == 1)
 133                 glColor4fv(green);
 134         else
 135                 glColor4fv(red);
 136
 137         glBindBufferARB(GL_ARRAY_BUFFER_ARB, vb_c0);
 138         glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, ib_c0);
 139         glEnableClientState(GL_VERTEX_ARRAY);
 140         glVertexPointer(2, GL_FLOAT, 0, (void *)0);
 141
 142         glDrawElements(GL_TRIANGLE_FAN, 4, GL_UNSIGNED_INT, (void *)0);
 143 }
 144
 145 enum piglit_result
 146 draw(Display *dpy)
 147 {
 148         bool pass;
 149
 150         context0_frame();
 151         context1_frame(0);
 152         /* The issue was that on the second frame, failure occurred. */
 153         context0_frame();
 154         context1_frame(1);
 155
 156         pass = piglit_probe_rect_rgb(0, 0, piglit_width, piglit_height, green);
 157
 158         glXSwapBuffers(dpy, win);
 159
 160         glXMakeCurrent(dpy, None, None);
 161
 162         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 163 }
 164
 165 int
 166 main(int argc, char **argv)
 167 {
 168         XVisualInfo *visinfo;
 169         int i;
 170
 171         for(i = 1; i < argc; ++i) {
 172                 if (!strcmp(argv[i], "-auto"))
 173                         piglit_automatic = 1;
 174                 else
 175                         fprintf(stderr, "Unknown option: %s\n", argv[i]);
 176         }
 177
 178         dpy = XOpenDisplay(NULL);
 179         if (dpy == NULL) {
 180                 fprintf(stderr, "couldn't open display\n");
 181                 piglit_report_result(PIGLIT_FAIL);
 182         }
 183         visinfo = piglit_get_glx_visual(dpy);
 184         win = piglit_get_glx_window(dpy, visinfo);
 185
 186         ctx0 = piglit_get_glx_context(dpy, visinfo);
 187         ctx1 = piglit_get_glx_context(dpy, visinfo);
 188
 189         glXMakeCurrent(dpy, win, ctx0);
 190         piglit_dispatch_default_init(PIGLIT_DISPATCH_GL);
 191         piglit_require_extension("GL_ARB_vertex_buffer_object");
 192         context0_init();
 193         glXMakeCurrent(dpy, win, ctx1);
 194         context1_init();
 195
 196         piglit_glx_event_loop(dpy, draw);
 197
 198         XFree(visinfo);
 199         glXDestroyContext(dpy, ctx0);
 200         glXDestroyContext(dpy, ctx1);
 201
 202         return 0;
 203 }