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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 glReadPixels speed.
* XXX also read into a PBO?
* XXX also read from FBOs?
*
* Brian Paul
* 23 Sep 2009
*/
#include <string.h>
#include <assert.h>
#include "glmain.h"
#include "common.h"
int WinWidth = 1000, WinHeight = 1000;
static GLuint VBO;
static const GLboolean DrawPoint = GL_TRUE;
static const GLboolean BufferSubDataInHalves = GL_TRUE;
static const GLfloat Vertex0[2] = { 0.0, 0.0 };
static GLenum HaveDepthStencil;
static GLenum ReadFormat, ReadType;
static GLint ReadWidth, ReadHeight;
static GLvoid *ReadBuffer;
/** Called from test harness/main */
void
PerfInit(void)
{
/* setup VBO */
glGenBuffersARB(1, &VBO);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBO);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(Vertex0), Vertex0, GL_STATIC_DRAW_ARB);
glVertexPointer(2, GL_FLOAT, sizeof(Vertex0), (void *) 0);
glEnableClientState(GL_VERTEX_ARRAY);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
HaveDepthStencil = PerfExtensionSupported("GL_EXT_packed_depth_stencil");
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_STENCIL_TEST);
}
static void
ReadPixels(unsigned count)
{
unsigned i;
for (i = 0; i < count; i++) {
/* read from random pos */
GLint x, y;
x = WinWidth - ReadWidth;
y = WinHeight - ReadHeight;
if (x > 0)
x = rand() % x;
if (y > 0)
y = rand() % y;
if (DrawPoint)
glDrawArrays(GL_POINTS, 0, 1);
glReadPixels(x, y, ReadWidth, ReadHeight,
ReadFormat, ReadType, ReadBuffer);
}
glFinish();
}
static const GLsizei Sizes[] = {
10,
100,
500,
1000,
0
};
static const struct {
GLenum format;
GLenum type;
const char *name;
GLuint pixel_size;
} DstFormats[] = {
{ GL_RGBA, GL_UNSIGNED_BYTE, "RGBA/ubyte", 4 },
{ GL_BGRA, GL_UNSIGNED_BYTE, "BGRA/ubyte", 4 },
{ GL_RGB, GL_UNSIGNED_SHORT_5_6_5, "RGB/565", 2 },
{ GL_LUMINANCE, GL_UNSIGNED_BYTE, "L/ubyte", 1 },
{ GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, "Z/uint", 4 },
{ GL_DEPTH_STENCIL_EXT, GL_UNSIGNED_INT_24_8_EXT, "Z+S/uint", 4 },
{ 0, 0, NULL, 0 }
};
/** Called from test harness/main */
void
PerfNextRound(void)
{
}
/** Called from test harness/main */
void
PerfDraw(void)
{
double rate, mbPerSec;
int fmt, sz;
/* loop over formats */
for (fmt = 0; DstFormats[fmt].format; fmt++) {
ReadFormat = DstFormats[fmt].format;
ReadType = DstFormats[fmt].type;
/* loop over sizes */
for (sz = 0; Sizes[sz]; sz++) {
int imgSize;
ReadWidth = ReadHeight = Sizes[sz];
imgSize = ReadWidth * ReadHeight * DstFormats[fmt].pixel_size;
ReadBuffer = malloc(imgSize);
if (ReadFormat == GL_DEPTH_STENCIL_EXT && !HaveDepthStencil) {
rate = 0.0;
mbPerSec = 0.0;
}
else {
rate = PerfMeasureRate(ReadPixels);
mbPerSec = rate * imgSize / (1024.0 * 1024.0);
}
perf_printf("glReadPixels(%d x %d, %s): %.1f images/sec, %.1f Mpixels/sec\n",
ReadWidth, ReadHeight,
DstFormats[fmt].name, rate, mbPerSec);
free(ReadBuffer);
}
}
exit(0);
}
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