-/* $Id: texdown.c,v 1.3 2000/03/29 18:02:52 brianp Exp $ */
/*
* Copyright (C) 1999 Brian Paul 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
#include <GL/glut.h>
-static GLsizei MaxSize = 1024;
-static GLsizei TexWidth = 256, TexHeight = 256, TexBorder = 0;
+static GLsizei MaxSize = 2048;
+static GLsizei TexWidth = 1024, TexHeight = 1024, TexBorder = 0;
static GLboolean ScaleAndBias = GL_FALSE;
static GLboolean SubImage = GL_FALSE;
static GLdouble DownloadRate = 0.0; /* texels/sec */
static GLuint Mode = 0;
-#define NUM_FORMATS 4
+/* Try and avoid L2 cache effects by cycling through a small number of
+ * textures.
+ *
+ * At the initial size of 1024x1024x4 == 4mbyte, say 8 textures will
+ * keep us out of most caches at 32mb total.
+ *
+ * This turns into a fairly interesting question of what exactly you
+ * expect to be in cache in normal usage, and what you think should be
+ * outside. There's no rules for this, no reason to favour one usage
+ * over another except what the application you care about happens to
+ * resemble most closely.
+ *
+ * - Should the client texture image be in L2 cache? Has it just been
+ * generated or read from disk?
+ * - Does the application really use >1 texture, or is it constantly
+ * updating one image in-place?
+ *
+ * Different answers will favour different texture upload mechanisms.
+ * To upload an image that is purely outside of cache, a DMA-based
+ * upload will probably win, whereas for small, in-cache textures,
+ * copying looks good.
+ */
+#define NR_TEXOBJ 4
+static GLuint TexObj[NR_TEXOBJ];
+
+
struct FormatRec {
GLenum Format;
GLenum Type;
};
-static const struct FormatRec FormatTable[NUM_FORMATS] = {
+static const struct FormatRec FormatTable[] = {
/* Format Type IntFormat TexelSize */
+ { GL_BGRA, GL_UNSIGNED_BYTE, GL_RGBA, 4 },
{ GL_RGB, GL_UNSIGNED_BYTE, GL_RGB, 3 },
{ GL_RGBA, GL_UNSIGNED_BYTE, GL_RGBA, 4 },
{ GL_RGBA, GL_UNSIGNED_BYTE, GL_RGB, 4 },
{ GL_RGB, GL_UNSIGNED_SHORT_5_6_5, GL_RGB, 2 },
+ { GL_LUMINANCE, GL_UNSIGNED_BYTE, GL_LUMINANCE, 1 },
+ { GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, GL_LUMINANCE_ALPHA, 2 },
+ { GL_ALPHA, GL_UNSIGNED_BYTE, GL_ALPHA, 1 },
};
static GLint Format;
+#define NUM_FORMATS (sizeof(FormatTable)/sizeof(FormatTable[0]))
static int
BytesPerTexel(GLint format)
return "GL_RGB";
case GL_RGBA:
return "GL_RGBA";
+ case GL_BGRA:
+ return "GL_BGRA";
+ case GL_LUMINANCE:
+ return "GL_LUMINANCE";
+ case GL_LUMINANCE_ALPHA:
+ return "GL_LUMINANCE_ALPHA";
+ case GL_ALPHA:
+ return "GL_ALPHA";
default:
return "";
}
}
}
+/* On x86, there is a performance cliff for memcpy to texture memory
+ * for sources below 64 byte alignment. We do our best with this in
+ * the driver, but it is better if the images are correctly aligned to
+ * start with:
+ */
+#define ALIGN (1<<12)
+
+static unsigned align(unsigned value, unsigned a)
+{
+ return (value + a - 1) & ~(a-1);
+}
+
+static int MIN2(int a, int b)
+{
+ return a < b ? a : b;
+}
static void
MeasureDownloadRate(void)
{
const int w = TexWidth + 2 * TexBorder;
const int h = TexHeight + 2 * TexBorder;
- const int bytes = w * h * BytesPerTexel(Format);
+ const int image_bytes = align(w * h * BytesPerTexel(Format), ALIGN);
+ const int bytes = image_bytes * NR_TEXOBJ;
+ GLubyte *orig_texImage, *orig_getImage;
GLubyte *texImage, *getImage;
GLdouble t0, t1, time;
int count;
int i;
+ int offset = 0;
+ GLdouble total = 0; /* ints will tend to overflow */
+
+ printf("allocating %d bytes for %d %dx%d images\n",
+ bytes, NR_TEXOBJ, w, h);
- texImage = (GLubyte *) malloc(bytes);
- getImage = (GLubyte *) malloc(bytes);
- if (!texImage || !getImage) {
+ orig_texImage = (GLubyte *) malloc(bytes + ALIGN);
+ orig_getImage = (GLubyte *) malloc(image_bytes + ALIGN);
+ if (!orig_texImage || !orig_getImage) {
DownloadRate = 0.0;
return;
}
+ printf("alloc %p %p\n", orig_texImage, orig_getImage);
+
+ texImage = (GLubyte *)align((unsigned)orig_texImage, ALIGN);
+ getImage = (GLubyte *)align((unsigned)orig_getImage, ALIGN);
+
+ for (i = 1; !(((unsigned)texImage) & i); i<<=1)
+ ;
+ printf("texture image alignment: %d bytes (%p)\n", i, texImage);
+
for (i = 0; i < bytes; i++) {
texImage[i] = i & 0xff;
}
glPixelTransferf(GL_BLUE_BIAS, 0.0);
}
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glEnable(GL_TEXTURE_2D);
+
count = 0;
t0 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
do {
+ int img = count%NR_TEXOBJ;
+ GLubyte *img_ptr = texImage + img * image_bytes;
+
+ glBindTexture(GL_TEXTURE_2D, TexObj[img]);
+
if (SubImage && count > 0) {
- glTexSubImage2D(GL_TEXTURE_2D, 0, -TexBorder, -TexBorder, w, h,
+ /* Only update a portion of the image each iteration. This
+ * is presumably why you'd want to use texsubimage, otherwise
+ * you may as well just call teximage again.
+ *
+ * A bigger question is whether to use a pointer that moves
+ * with each call, ie does the incoming data come from L2
+ * cache under normal circumstances, or is it pulled from
+ * uncached memory?
+ *
+ * There's a good argument to say L2 cache, ie you'd expect
+ * the data to have been recently generated. It's possible
+ * that it could have come from a file read, which may or may
+ * not have gone through the cpu.
+ */
+ glTexSubImage2D(GL_TEXTURE_2D, 0,
+ -TexBorder,
+ -TexBorder + offset * h/8,
+ w,
+ h/8,
FormatTable[Format].Format,
- FormatTable[Format].Type, texImage);
+ FormatTable[Format].Type,
+#if 1
+ texImage /* likely in L2$ */
+#else
+ img_ptr + offset * bytes/8 /* unlikely in L2$ */
+#endif
+ );
+ offset += 1;
+ offset %= 8;
+ total += w * h / 8;
}
else {
glTexImage2D(GL_TEXTURE_2D, 0,
FormatTable[Format].IntFormat, w, h, TexBorder,
FormatTable[Format].Format,
- FormatTable[Format].Type, texImage);
+ FormatTable[Format].Type,
+ img_ptr);
+ total += w*h;
}
- if (count == 0) {
- /* draw a tiny polygon to force texture into texram */
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- glEnable(GL_TEXTURE_2D);
- glBegin(GL_TRIANGLES);
- glTexCoord2f(0, 0); glVertex2f(1, 1);
- glTexCoord2f(1, 0); glVertex2f(3, 1);
- glTexCoord2f(0.5, 1); glVertex2f(2, 3);
- glEnd();
- glDisable(GL_TEXTURE_2D);
- }
+ /* draw a tiny polygon to force texture into texram */
+ glBegin(GL_TRIANGLES);
+ glTexCoord2f(0, 0); glVertex2f(1, 1);
+ glTexCoord2f(1, 0); glVertex2f(3, 1);
+ glTexCoord2f(0.5, 1); glVertex2f(2, 3);
+ glEnd();
t1 = glutGet(GLUT_ELAPSED_TIME) * 0.001;
time = t1 - t0;
count++;
} while (time < 3.0);
- printf("w*h=%d count=%d time=%f\n", w*h, count, time);
- DownloadRate = w * h * count / time;
-
-#if 0
- if (!ScaleAndBias) {
- /* verify texture readback */
- glGetTexImage(GL_TEXTURE_2D, 0,
- FormatTable[Format].Format,
- FormatTable[Format].Type, getImage);
- for (i = 0; i < w * h; i++) {
- if (texImage[i] != getImage[i]) {
- printf("[%d] %d != %d\n", i, texImage[i], getImage[i]);
- }
- }
- }
-#endif
+ glDisable(GL_TEXTURE_2D);
+
+ printf("total texels=%f time=%f\n", total, time);
+ DownloadRate = total / time;
- free(texImage);
- free(getImage);
+
+ free(orig_texImage);
+ free(orig_getImage);
{
GLint err = glGetError();
Format = (Format + 1) % NUM_FORMATS;
Mode = 0;
break;
+ case 'F':
+ /* change format */
+ Format = (Format - 1) % NUM_FORMATS;
+ Mode = 0;
+ break;
case 'p':
/* toggle border */
ScaleAndBias = !ScaleAndBias;
projects / mesa.git / blobdiff