From c9ddd6f810ce016cabf232c53ffca186ef885140 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Thu, 24 Sep 2009 19:36:37 -0600
Subject: [PATCH] progs/perf: glGenerateMipmap() test

---
 progs/perf/Makefile    |   1 +
 progs/perf/SConscript  |   1 +
 progs/perf/genmipmap.c | 136 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 138 insertions(+)
 create mode 100644 progs/perf/genmipmap.c

diff --git a/progs/perf/Makefile b/progs/perf/Makefile
index 043e91d669b..066eb8608ec 100644
--- a/progs/perf/Makefile
+++ b/progs/perf/Makefile
@@ -18,6 +18,7 @@ PROG_SOURCES = \
 	drawoverhead.c \
 	fbobind.c \
 	fill.c \
+	genmipmap.c \
 	readpixels.c \
 	swapbuffers.c \
 	teximage.c \
diff --git a/progs/perf/SConscript b/progs/perf/SConscript
index 84f1669e5ea..a5ec9a7c2a0 100644
--- a/progs/perf/SConscript
+++ b/progs/perf/SConscript
@@ -12,6 +12,7 @@ progs = [
       'drawoverhead',
       'fbobind',
       'fill',
+      'genmipmap',
       'readpixels',
       'swapbuffers',
       'teximage',
diff --git a/progs/perf/genmipmap.c b/progs/perf/genmipmap.c
new file mode 100644
index 00000000000..4b7d6ad155b
--- /dev/null
+++ b/progs/perf/genmipmap.c
@@ -0,0 +1,136 @@
+/*
+ * 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);
+}
-- 
2.30.2