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/*
* 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"
int WinWidth = 100, WinHeight = 100;
static GLuint VBO;
static GLsizei VBOSize = 0;
static GLubyte *VBOData = NULL;
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;
for (i = 0; i < count; i++) {
glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData, GL_STREAM_DRAW_ARB);
if (DrawPoint)
glDrawArrays(GL_POINTS, 0, 1);
}
glFinish();
}
static void
UploadSubVBO(unsigned count)
{
unsigned i;
for (i = 0; i < count; i++) {
if (BufferSubDataInHalves) {
GLsizei half = VBOSize / 2;
glBufferSubDataARB(GL_ARRAY_BUFFER, 0, half, VBOData);
glBufferSubDataARB(GL_ARRAY_BUFFER, half, half, VBOData + half);
}
else {
glBufferSubDataARB(GL_ARRAY_BUFFER, 0, VBOSize, VBOData);
}
if (DrawPoint)
glDrawArrays(GL_POINTS, 0, 1);
}
glFinish();
}
static const GLsizei Sizes[] = {
64,
1024,
16*1024,
256*1024,
1024*1024,
16*1024*1024,
0 /* end of list */
};
/** Called from test harness/main */
void
PerfDraw(void)
{
double rate, mbPerSec;
int sub, sz;
/* loop over whole/sub buffer upload */
for (sub = 0; sub < 2; sub++) {
/* loop over VBO sizes */
for (sz = 0; Sizes[sz]; sz++) {
VBOSize = Sizes[sz];
VBOData = malloc(VBOSize);
memcpy(VBOData, Vertex0, sizeof(Vertex0));
if (sub)
rate = PerfMeasureRate(UploadSubVBO);
else
rate = PerfMeasureRate(UploadVBO);
mbPerSec = rate * VBOSize / (1024.0 * 1024.0);
printf(" glBuffer%sDataARB(size = %d): %.1f MB/sec\n",
(sub ? "Sub" : ""), VBOSize, mbPerSec);
free(VBOData);
}
}
exit(0);
}
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