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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 glGenerateMipmap() speed.
*
* Brian Paul
* 24 Sep 2009
*/
#include <string.h>
#include "glmain.h"
#include "common.h"
int WinWidth = 100, WinHeight = 100;
static GLboolean DrawPoint = GL_TRUE;
static GLuint VBO;
static GLuint TexObj = 0;
static GLint BaseLevel, MaxLevel;
struct vertex
{
GLfloat x, y, s, t;
};
static const struct vertex vertices[1] = {
{ 0.0, 0.0, 0.5, 0.5 },
};
#define VOFFSET(F) ((void *) offsetof(struct vertex, F))
/** Called from test harness/main */
void
PerfInit(void)
{
/* setup VBO w/ vertex data */
glGenBuffersARB(1, &VBO);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBO);
glBufferDataARB(GL_ARRAY_BUFFER_ARB,
sizeof(vertices), vertices, GL_STATIC_DRAW_ARB);
glVertexPointer(2, GL_FLOAT, sizeof(struct vertex), VOFFSET(x));
glTexCoordPointer(2, GL_FLOAT, sizeof(struct vertex), VOFFSET(s));
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glGenTextures(1, &TexObj);
glBindTexture(GL_TEXTURE_2D, TexObj);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnable(GL_TEXTURE_2D);
}
static void
GenMipmap(unsigned count)
{
unsigned i;
for (i = 0; i < count; i++) {
GLubyte texel[4];
texel[0] = texel[1] = texel[2] = texel[3] = i & 0xff;
/* dirty the base image */
glTexSubImage2D(GL_TEXTURE_2D, BaseLevel,
0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, texel);
glGenerateMipmap(GL_TEXTURE_2D);
if (DrawPoint)
glDrawArrays(GL_POINTS, 0, 1);
}
glFinish();
}
/** Called from test harness/main */
void
PerfNextRound(void)
{
}
/** Called from test harness/main */
void
PerfDraw(void)
{
const GLint NumLevels = 12;
const GLint TexWidth = 2048, TexHeight = 2048;
GLubyte *img;
double rate;
/* Make 2K x 2K texture */
img = (GLubyte *) malloc(TexWidth * TexHeight * 4);
memset(img, 128, TexWidth * TexHeight * 4);
glTexImage2D(GL_TEXTURE_2D, 0,
GL_RGBA, TexWidth, TexHeight, 0,
GL_RGBA, GL_UNSIGNED_BYTE, img);
free(img);
perf_printf("Texture level[0] size: %d x %d, %d levels\n",
TexWidth, TexHeight, NumLevels);
/* loop over base levels 0, 2, 4 */
for (BaseLevel = 0; BaseLevel <= 4; BaseLevel += 2) {
/* loop over max level */
for (MaxLevel = NumLevels; MaxLevel > BaseLevel; MaxLevel--) {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel);
rate = PerfMeasureRate(GenMipmap);
perf_printf(" glGenerateMipmap(levels %d..%d): %.2f gens/sec\n",
BaseLevel + 1, MaxLevel, rate);
}
}
exit(0);
}
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