progs/perf: added fbobind.c test to test FBO binding speed

progs/perf/Makefile

@@ -15,6 +15,7 @@ LDLIBS = $(LIBS)
 
 PROG_SOURCES = \
 	drawoverhead.c \
+	fbobind.c \
 	fill.c \
 	swapbuffers.c \
 	teximage.c \

progs/perf/SConscript

@@ -9,6 +9,7 @@ env.Prepend(LIBS = ['$GLUT_LIB'])
 
 progs = [
       'drawoverhead',
+      'fbobind',
       'fill',
       'teximage',
       'swapbuffers',

progs/perf/fbobind.c

@@ -0,0 +1,151 @@
+/*
+ * 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 rate of binding/switching between FBO targets.
+ * Create two framebuffer objects for rendering to two textures.
+ * Ping pong between texturing from one and drawing into the other.
+ *
+ * Brian Paul
+ * 22 Sep 2009
+ */
+
+#include <string.h>
+#include "glmain.h"
+#include "common.h"
+
+int WinWidth = 100, WinHeight = 100;
+
+static GLuint VBO;
+
+static GLuint FBO[2], Tex[2];
+
+static const GLsizei TexSize = 512;
+
+static const GLboolean DrawPoint = 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)
+{
+   const GLenum filter = GL_LINEAR;
+   GLenum stat;
+   int i;
+
+   if (!PerfExtensionSupported("GL_EXT_framebuffer_object")) {
+      perf_printf("fboswitch: GL_EXT_framebuffer_object not supported\n");
+      exit(0);
+   }
+
+   /* setup VBO */
+   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);
+
+   glGenFramebuffersEXT(2, FBO);
+   glGenTextures(2, Tex);
+
+   for (i = 0; i < 2; i++) {
+      /* setup texture */
+      glBindTexture(GL_TEXTURE_2D, Tex[i]);
+      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
+                   TexSize, TexSize, 0,
+                   GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
+      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
+
+      
+      /* setup fbo */
+      glBindFramebufferEXT(GL_FRAMEBUFFER, FBO[i]);
+      glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
+                                GL_COLOR_ATTACHMENT0_EXT,
+                                GL_TEXTURE_2D, Tex[i], 0/*level*/);
+      stat = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+      if (stat != GL_FRAMEBUFFER_COMPLETE_EXT) {
+         perf_printf("fboswitch: Error: incomplete FBO!\n");
+         exit(1);
+      }
+
+      /* clear the FBO */
+      glClear(GL_COLOR_BUFFER_BIT);
+   }
+}
+
+
+static void
+FBOBind(unsigned count)
+{
+   unsigned i;
+   for (i = 1; i < count; i++) {
+      const GLuint dst = i & 1;
+      const GLuint src = 1 - dst;
+
+      /* bind src texture */
+      glBindTexture(GL_TEXTURE_2D, Tex[src]);
+
+      /* bind dst fbo */
+      glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBO[dst]);
+      glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
+
+      /* draw something */
+      if (DrawPoint)
+         glDrawArrays(GL_POINTS, 0, 1);
+   }
+   glFinish();
+}
+
+
+/** Called from test harness/main */
+void
+PerfNextRound(void)
+{
+}
+
+
+/** Called from test harness/main */
+void
+PerfDraw(void)
+{
+   double rate;
+
+   rate = PerfMeasureRate(FBOBind);
+   perf_printf("  FBO Binding: %1.f binds/sec\n", rate);
+
+   exit(0);
+}