138 lines
3.4 KiB
C
138 lines
3.4 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 drawing overhead
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*
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* This is the first in a series of simple performance benchmarks.
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* The code in this file should be as simple as possible to make it
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* easily portable to other APIs.
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*
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* All the window-system stuff should be contained in glmain.c (or TBDmain.c).
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*
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* Brian Paul
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* 15 Sep 2009
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*/
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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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struct vertex
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{
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GLfloat x, y;
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};
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static const struct vertex vertices[4] = {
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{ -1.0, -1.0 },
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{ 1.0, -1.0 },
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{ 1.0, 1.0 },
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{ -1.0, 1.0 }
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};
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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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/* setup VBO w/ vertex data */
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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,
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sizeof(vertices), vertices, GL_STATIC_DRAW_ARB);
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glVertexPointer(2, GL_FLOAT, sizeof(struct vertex), (void *) 0);
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glEnableClientState(GL_VERTEX_ARRAY);
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/* misc GL state */
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glAlphaFunc(GL_ALWAYS, 0.0);
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}
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static void
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DrawNoStateChange(unsigned count)
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{
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unsigned i;
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for (i = 0; i < count; i++) {
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glDrawArrays(GL_POINTS, 0, 4);
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}
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glFinish();
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}
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static void
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DrawNopStateChange(unsigned count)
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{
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unsigned i;
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for (i = 0; i < count; i++) {
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glDisable(GL_ALPHA_TEST);
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glDrawArrays(GL_POINTS, 0, 4);
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}
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glFinish();
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}
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static void
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DrawStateChange(unsigned count)
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{
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unsigned i;
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for (i = 0; i < count; i++) {
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if (i & 1)
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glEnable(GL_TEXTURE_GEN_S);
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else
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glDisable(GL_TEXTURE_GEN_S);
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glDrawArrays(GL_POINTS, 0, 4);
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}
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glFinish();
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}
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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 rate0, rate1, rate2, overhead;
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rate0 = PerfMeasureRate(DrawNoStateChange);
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perf_printf(" Draw only: %s draws/second\n",
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PerfHumanFloat(rate0));
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rate1 = PerfMeasureRate(DrawNopStateChange);
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overhead = 1000.0 * (1.0 / rate1 - 1.0 / rate0);
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perf_printf(" Draw w/ nop state change: %s draws/sec (overhead: %f ms/draw)\n",
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PerfHumanFloat(rate1), overhead);
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rate2 = PerfMeasureRate(DrawStateChange);
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overhead = 1000.0 * (1.0 / rate2 - 1.0 / rate0);
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perf_printf(" Draw w/ state change: %s draws/sec (overhead: %f ms/draw)\n",
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PerfHumanFloat(rate2), overhead);
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exit(0);
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}
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