154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
/*
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* Copyright (C) 2009 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VMWARE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* Measure rate of binding/switching between FBO targets.
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* Create two framebuffer objects for rendering to two textures.
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* Ping pong between texturing from one and drawing into the other.
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*
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* Brian Paul
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* 22 Sep 2009
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*/
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#include <string.h>
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#include "glmain.h"
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#include "common.h"
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int WinWidth = 100, WinHeight = 100;
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static GLuint VBO;
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static GLuint FBO[2], Tex[2];
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static const GLsizei TexSize = 512;
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static const GLboolean DrawPoint = GL_TRUE;
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struct vertex
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{
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GLfloat x, y, s, t;
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};
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static const struct vertex vertices[1] = {
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{ 0.0, 0.0, 0.5, 0.5 },
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};
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#define VOFFSET(F) ((void *) offsetof(struct vertex, F))
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/** Called from test harness/main */
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void
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PerfInit(void)
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{
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const GLenum filter = GL_LINEAR;
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GLenum stat;
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int i;
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if (!PerfExtensionSupported("GL_EXT_framebuffer_object")) {
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perf_printf("fboswitch: GL_EXT_framebuffer_object not supported\n");
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exit(0);
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}
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/* setup VBO */
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glGenBuffersARB(1, &VBO);
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBO);
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glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(vertices),
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vertices, GL_STATIC_DRAW_ARB);
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glVertexPointer(2, GL_FLOAT, sizeof(struct vertex), VOFFSET(x));
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glTexCoordPointer(2, GL_FLOAT, sizeof(struct vertex), VOFFSET(s));
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glGenFramebuffersEXT(2, FBO);
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glGenTextures(2, Tex);
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for (i = 0; i < 2; i++) {
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/* setup texture */
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glBindTexture(GL_TEXTURE_2D, Tex[i]);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
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TexSize, TexSize, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);
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/* setup fbo */
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glBindFramebufferEXT(GL_FRAMEBUFFER, FBO[i]);
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glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
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GL_COLOR_ATTACHMENT0_EXT,
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GL_TEXTURE_2D, Tex[i], 0/*level*/);
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stat = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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if (stat != GL_FRAMEBUFFER_COMPLETE_EXT) {
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perf_printf("fboswitch: Error: incomplete FBO!\n");
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exit(1);
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}
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/* clear the FBO */
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glClear(GL_COLOR_BUFFER_BIT);
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}
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glEnable(GL_TEXTURE_2D);
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}
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static void
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FBOBind(unsigned count)
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{
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unsigned i;
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for (i = 1; i < count; i++) {
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const GLuint dst = i & 1;
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const GLuint src = 1 - dst;
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/* bind src texture */
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glBindTexture(GL_TEXTURE_2D, Tex[src]);
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/* bind dst fbo */
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glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBO[dst]);
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glDrawBuffer(GL_COLOR_ATTACHMENT0_EXT);
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/* draw something */
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if (DrawPoint)
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glDrawArrays(GL_POINTS, 0, 1);
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}
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glFinish();
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}
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/** Called from test harness/main */
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void
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PerfNextRound(void)
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{
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}
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/** Called from test harness/main */
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void
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PerfDraw(void)
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{
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double rate;
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rate = PerfMeasureRate(FBOBind);
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perf_printf(" FBO Binding: %1.f binds/sec\n", rate);
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exit(0);
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}
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