1 files changed, 246 insertions, 0 deletions
diff --git a/progs/perf/vbo.c b/progs/perf/vbo.c
new file mode 100644
index 0000000000..b326c056ec
--- /dev/null
+++ b/progs/perf/vbo.c
@@ -0,0 +1,246 @@
+/*
+ * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VMWARE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * Measure VBO upload speed.
+ * That is, measure glBufferDataARB() and glBufferSubDataARB().
+ *
+ * Brian Paul
+ * 16 Sep 2009
+ */
+
+#include <string.h>
+#include "glmain.h"
+#include "common.h"
+
+/* Copy data out of a large array to avoid caching effects:
+ */
+#define DATA_SIZE (16*1024*1024)
+
+int WinWidth = 100, WinHeight = 100;
+
+static GLuint VBO;
+
+static GLsizei VBOSize = 0;
+static GLsizei SubSize = 0;
+static GLubyte *VBOData = NULL;  /* array[DATA_SIZE] */
+
+static const GLboolean DrawPoint = GL_TRUE;
+static const GLboolean BufferSubDataInHalves = GL_TRUE;
+
+static const GLfloat Vertex0[2] = { 0.0, 0.0 };
+
+
+/** Called from test harness/main */
+void
+PerfInit(void)
+{
+   /* setup VBO */
+   glGenBuffersARB(1, &VBO);
+   glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBO);
+   glVertexPointer(2, GL_FLOAT, sizeof(Vertex0), (void *) 0);
+   glEnableClientState(GL_VERTEX_ARRAY);
+}
+
+
+static void
+UploadVBO(unsigned count)
+{
+   unsigned i;
+   unsigned total = 0;
+   unsigned src = 0;
+
+   for (i = 0; i < count; i++) {
+      glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData + src, GL_STREAM_DRAW_ARB);
+      glDrawArrays(GL_POINTS, 0, 1);
+
+      /* Throw in an occasional flush to work around a driver crash:
+       */
+      total += VBOSize;
+      if (total >= 16*1024*1024) {
+         glFlush();
+         total = 0;
+      }
+
+      src += VBOSize;
+      src %= DATA_SIZE;
+   }
+   glFinish();
+}
+
+
+static void
+UploadSubVBO(unsigned count)
+{
+   unsigned i;
+   unsigned src = 0;
+
+   for (i = 0; i < count; i++) {
+      unsigned offset = (i * SubSize) % VBOSize;
+      glBufferSubDataARB(GL_ARRAY_BUFFER, offset, SubSize, VBOData + src);
+
+      if (DrawPoint) {
+         glDrawArrays(GL_POINTS, offset / sizeof(Vertex0), 1);
+      }
+
+      src += SubSize;
+      src %= DATA_SIZE;
+   }
+   glFinish();
+}
+
+
+/* Do multiple small SubData uploads, then call DrawArrays.  This may be a
+ * fairer comparison to back-to-back BufferData calls:
+ */
+static void
+BatchUploadSubVBO(unsigned count)
+{
+   unsigned i = 0, j;
+   unsigned period = VBOSize / SubSize;
+   unsigned src = 0;
+
+   while (i < count) {
+      for (j = 0; j < period && i < count; j++, i++) {
+         unsigned offset = j * SubSize;
+         glBufferSubDataARB(GL_ARRAY_BUFFER, offset, SubSize, VBOData + src);
+      }
+
+      glDrawArrays(GL_POINTS, 0, 1);
+
+      src += SubSize;
+      src %= DATA_SIZE;
+   }
+   glFinish();
+}
+
+
+/**
+ * Test the sequence:
+ *    create/load VBO
+ *    draw
+ *    destroy VBO
+ */
+static void
+CreateDrawDestroyVBO(unsigned count)
+{
+   unsigned i;
+   for (i = 0; i < count; i++) {
+      GLuint vbo;
+      /* create/load */
+      glGenBuffersARB(1, &vbo);
+      glBindBufferARB(GL_ARRAY_BUFFER_ARB, vbo);
+      glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData, GL_STREAM_DRAW_ARB);
+      /* draw */
+      glVertexPointer(2, GL_FLOAT, sizeof(Vertex0), (void *) 0);
+      glDrawArrays(GL_POINTS, 0, 1);
+      /* destroy */
+      glDeleteBuffersARB(1, &vbo);
+   }
+   glFinish();
+}
+
+
+static const GLsizei Sizes[] = {
+   64,
+   1024,
+   16*1024,
+   256*1024,
+   1024*1024,
+   16*1024*1024,
+   0 /* end of list */
+};
+
+void
+PerfNextRound(void)
+{
+}
+
+/** Called from test harness/main */
+void
+PerfDraw(void)
+{
+   double rate, mbPerSec;
+   int i, sz;
+
+   /* Load VBOData buffer with duplicated Vertex0.
+    */
+   VBOData = calloc(DATA_SIZE, 1);
+
+   for (i = 0; i < DATA_SIZE / sizeof(Vertex0); i++) {
+      memcpy(VBOData + i * sizeof(Vertex0), 
+             Vertex0, 
+             sizeof(Vertex0));
+   }
+
+   /* glBufferDataARB()
+    */
+   for (sz = 0; Sizes[sz]; sz++) {
+      SubSize = VBOSize = Sizes[sz];
+      rate = PerfMeasureRate(UploadVBO);
+      mbPerSec = rate * VBOSize / (1024.0 * 1024.0);
+      perf_printf("  glBufferDataARB(size = %d): %.1f MB/sec\n",
+                  VBOSize, mbPerSec);
+   }
+
+   /* glBufferSubDataARB()
+    */
+   for (sz = 0; Sizes[sz]; sz++) {
+      SubSize = VBOSize = Sizes[sz];
+      rate = PerfMeasureRate(UploadSubVBO);
+      mbPerSec = rate * VBOSize / (1024.0 * 1024.0);
+      perf_printf("  glBufferSubDataARB(size = %d): %.1f MB/sec\n",
+                  VBOSize, mbPerSec);
+   }
+
+   /* Batch upload
+    */
+   VBOSize = 1024 * 1024;
+   glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData, GL_STREAM_DRAW_ARB);
+
+   for (sz = 0; Sizes[sz] < VBOSize; sz++) {
+      SubSize = Sizes[sz];
+      rate = PerfMeasureRate(UploadSubVBO);
+      mbPerSec = rate * SubSize / (1024.0 * 1024.0);
+      perf_printf("  glBufferSubDataARB(size = %d, VBOSize = %d): %.1f MB/sec\n",
+                  SubSize, VBOSize, mbPerSec);
+   }
+
+   for (sz = 0; Sizes[sz] < VBOSize; sz++) {
+      SubSize = Sizes[sz];
+      rate = PerfMeasureRate(BatchUploadSubVBO);
+      mbPerSec = rate * SubSize / (1024.0 * 1024.0);
+      perf_printf("  glBufferSubDataARB(size = %d, VBOSize = %d), batched: %.1f MB/sec\n",
+                  SubSize, VBOSize, mbPerSec);
+   }
+
+   /* Create/Draw/Destroy
+    */
+   for (sz = 0; Sizes[sz]; sz++) {
+      SubSize = VBOSize = Sizes[sz];
+      rate = PerfMeasureRate(CreateDrawDestroyVBO);
+      mbPerSec = rate * VBOSize / (1024.0 * 1024.0);
+      perf_printf("  VBO Create/Draw/Destroy(size = %d): %.1f MB/sec, %.1f draws/sec\n",
+                  VBOSize, mbPerSec, rate);
+   }
+
+   exit(0);
+}