progs/perf/teximage.c

/*
 * 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 glTexSubImage2D rate
 *
 * Brian Paul
 * 16 Sep 2009
 */

#include "glmain.h"
#include "common.h"


int WinWidth = 100, WinHeight = 100;

static GLuint VBO;
static GLuint TexObj = 0;
static GLubyte *TexImage = NULL;
static GLsizei TexSize;
static GLenum TexSrcFormat, TexSrcType;

static const GLboolean DrawPoint = GL_TRUE;
static const GLboolean TexSubImage4 = GL_TRUE;

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);

   /* texture */
   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
UploadTexImage2D(unsigned count)
{
   unsigned i;
   for (i = 0; i < count; i++) {
      /* XXX is this equivalent to a glTexSubImage call since we're
       * always specifying the same image size?  That case isn't optimized
       * in Mesa but may be optimized in other drivers.  Note sure how
       * much difference that might make.
       */
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
                   TexSize, TexSize, 0,
                   TexSrcFormat, TexSrcType, TexImage);
      if (DrawPoint)
         glDrawArrays(GL_POINTS, 0, 1);
   }
   glFinish();
}


static void
UploadTexSubImage2D(unsigned count)
{
   unsigned i;
   for (i = 0; i < count; i++) {
      if (TexSubImage4) {
         GLsizei halfSize = (TexSize == 1) ? 1 : TexSize / 2;
         GLsizei halfPos = TexSize - halfSize;
         /* do glTexSubImage2D in four pieces */
         /* lower-left */
         glPixelStorei(GL_UNPACK_ROW_LENGTH, TexSize);
         glTexSubImage2D(GL_TEXTURE_2D, 0,
                         0, 0, halfSize, halfSize,
                         TexSrcFormat, TexSrcType, TexImage);
         /* lower-right */
         glPixelStorei(GL_UNPACK_SKIP_PIXELS, halfPos);
         glTexSubImage2D(GL_TEXTURE_2D, 0,
                         halfPos, 0, halfSize, halfSize,
                         TexSrcFormat, TexSrcType, TexImage);
         /* upper-left */
         glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
         glPixelStorei(GL_UNPACK_SKIP_ROWS, halfPos);
         glTexSubImage2D(GL_TEXTURE_2D, 0,
                         0, halfPos, halfSize, halfSize,
                         TexSrcFormat, TexSrcType, TexImage);
         /* upper-right */
         glPixelStorei(GL_UNPACK_SKIP_PIXELS, halfPos);
         glPixelStorei(GL_UNPACK_SKIP_ROWS, halfPos);
         glTexSubImage2D(GL_TEXTURE_2D, 0,
                         halfPos, halfPos, halfSize, halfSize,
                         TexSrcFormat, TexSrcType, TexImage);
         /* reset the unpacking state */
         glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
         glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
         glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
      }
      else {
         /* replace whole texture image at once */
         glTexSubImage2D(GL_TEXTURE_2D, 0,
                         0, 0, TexSize, TexSize,
                         TexSrcFormat, TexSrcType, TexImage);
      }
      if (DrawPoint)
         glDrawArrays(GL_POINTS, 0, 1);
   }
   glFinish();
}


/* XXX any other formats to measure? */
static const struct {
   GLenum format, type;
   const char *name;
} SrcFormats[] = {
   { GL_RGBA, GL_UNSIGNED_BYTE, "GL_RGBA/GLubyte" },
   { GL_BGRA, GL_UNSIGNED_BYTE, "GL_BGRA/GLubyte" },
   { 0, 0, NULL }
};



/** Called from test harness/main */
void
PerfDraw(void)
{
   GLint maxSize;
   double rate;
   GLint fmt, subImage;

   glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxSize);

   /* loop over source data formats */
   for (fmt = 0; SrcFormats[fmt].format; fmt++) {
      TexSrcFormat = SrcFormats[fmt].format;
      TexSrcType = SrcFormats[fmt].type;

      /* loop over glTexImage, glTexSubImage */
      for (subImage = 0; subImage < 2; subImage++) {

         /* loop over texture sizes */
         for (TexSize = 16; TexSize <= maxSize; TexSize *= 2) {
            GLint bytesPerImage;
            double mbPerSec;

            bytesPerImage = TexSize * TexSize * 4;
            TexImage = malloc(bytesPerImage);

            if (subImage) {
               /* create initial, empty texture */
               glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
                            TexSize, TexSize, 0,
                            TexSrcFormat, TexSrcType, NULL);
               rate = PerfMeasureRate(UploadTexSubImage2D);
            }
            else {
               rate = PerfMeasureRate(UploadTexImage2D);
            }

            mbPerSec = rate * bytesPerImage / (1024.0 * 1024.0);

            printf("  glTex%sImage2D(%s %d x %d): "
                   "%.1f images/sec, %.1f MB/sec\n",
                   (subImage ? "Sub" : ""),
                   SrcFormats[fmt].name, TexSize, TexSize, rate, mbPerSec);

            free(TexImage);
         }
      }
   }

   exit(0);
}