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Diffstat (limited to 'progs/perf/vbo.c')
| -rw-r--r-- | progs/perf/vbo.c | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/progs/perf/vbo.c b/progs/perf/vbo.c new file mode 100644 index 00000000000..a9d4102de9f --- /dev/null +++ b/progs/perf/vbo.c @@ -0,0 +1,245 @@ +/* + * 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 VBO upload speed. + * That is, measure glBufferDataARB() and glBufferSubDataARB(). + * + * Brian Paul + * 16 Sep 2009 + */ + +#include <string.h> +#include "glmain.h" +#include "common.h" + +/* Copy data out of a large array to avoid caching effects: + */ +#define DATA_SIZE (16*1024*1024) + +int WinWidth = 100, WinHeight = 100; + +static GLuint VBO; + +static GLsizei VBOSize = 0; +static GLsizei SubSize = 0; +static GLubyte *VBOData = NULL; /* array[DATA_SIZE] */ + +static const GLboolean DrawPoint = GL_TRUE; +static const GLboolean BufferSubDataInHalves = GL_TRUE; + +static const GLfloat Vertex0[2] = { 0.0, 0.0 }; + + +/** Called from test harness/main */ +void +PerfInit(void) +{ + /* setup VBO */ + glGenBuffersARB(1, &VBO); + glBindBufferARB(GL_ARRAY_BUFFER_ARB, VBO); + glVertexPointer(2, GL_FLOAT, sizeof(Vertex0), (void *) 0); + glEnableClientState(GL_VERTEX_ARRAY); +} + + +static void +UploadVBO(unsigned count) +{ + unsigned i; + unsigned total = 0; + unsigned src = 0; + + for (i = 0; i < count; i++) { + glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData + src, GL_STREAM_DRAW_ARB); + glDrawArrays(GL_POINTS, 0, 1); + + /* Throw in an occasional flush to work around a driver crash: + */ + total += VBOSize; + if (total >= 16*1024*1024) { + glFlush(); + total = 0; + } + + src += VBOSize; + src %= DATA_SIZE; + } + glFinish(); +} + + +static void +UploadSubVBO(unsigned count) +{ + unsigned i; + unsigned src = 0; + + for (i = 0; i < count; i++) { + unsigned offset = (i * SubSize) % VBOSize; + glBufferSubDataARB(GL_ARRAY_BUFFER, offset, SubSize, VBOData + src); + + if (DrawPoint) { + glDrawArrays(GL_POINTS, offset / sizeof(Vertex0), 1); + } + + src += SubSize; + src %= DATA_SIZE; + } + glFinish(); +} + + +/* Do multiple small SubData uploads, then call DrawArrays. This may be a + * fairer comparison to back-to-back BufferData calls: + */ +static void +BatchUploadSubVBO(unsigned count) +{ + unsigned i = 0, j; + unsigned period = VBOSize / SubSize; + unsigned src = 0; + + while (i < count) { + for (j = 0; j < period && i < count; j++, i++) { + unsigned offset = j * SubSize; + glBufferSubDataARB(GL_ARRAY_BUFFER, offset, SubSize, VBOData + src); + } + + glDrawArrays(GL_POINTS, 0, 1); + + src += SubSize; + src %= DATA_SIZE; + } + glFinish(); +} + + +/** + * Test the sequence: + * create/load VBO + * draw + * destroy VBO + */ +static void +CreateDrawDestroyVBO(unsigned count) +{ + unsigned i; + for (i = 0; i < count; i++) { + GLuint vbo; + /* create/load */ + glGenBuffersARB(1, &vbo); + glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData, GL_STREAM_DRAW_ARB); + /* draw */ + glVertexPointer(2, GL_FLOAT, sizeof(Vertex0), (void *) 0); + glDrawArrays(GL_POINTS, 0, 1); + /* destroy */ + glDeleteBuffersARB(1, &vbo); + } + glFinish(); +} + + +static const GLsizei Sizes[] = { + 64, + 1024, + 16*1024, + 256*1024, + 1024*1024, + 16*1024*1024, + 0 /* end of list */ +}; + +void +PerfNextRound(void) +{ +} + +/** Called from test harness/main */ +void +PerfDraw(void) +{ + double rate, mbPerSec; + int i, sz; + + /* Load VBOData buffer with duplicated Vertex0. + */ + VBOData = calloc(DATA_SIZE, 1); + + for (i = 0; i < DATA_SIZE / sizeof(Vertex0); i++) { + memcpy(VBOData + i * sizeof(Vertex0), + Vertex0, + sizeof(Vertex0)); + } + + /* glBufferDataARB() + */ + for (sz = 0; Sizes[sz]; sz++) { + SubSize = VBOSize = Sizes[sz]; + rate = PerfMeasureRate(UploadVBO); + mbPerSec = rate * VBOSize / (1024.0 * 1024.0); + perf_printf(" glBufferDataARB(size = %d): %.1f MB/sec\n", + VBOSize, mbPerSec); + } + + /* glBufferSubDataARB() + */ + for (sz = 0; Sizes[sz]; sz++) { + SubSize = VBOSize = Sizes[sz]; + rate = PerfMeasureRate(UploadSubVBO); + mbPerSec = rate * VBOSize / (1024.0 * 1024.0); + perf_printf(" glBufferSubDataARB(size = %d): %.1f MB/sec\n", + VBOSize, mbPerSec); + } + + /* Batch upload + */ + VBOSize = 1024 * 1024; + glBufferDataARB(GL_ARRAY_BUFFER, VBOSize, VBOData, GL_STREAM_DRAW_ARB); + + for (sz = 0; Sizes[sz] < VBOSize; sz++) { + SubSize = Sizes[sz]; + rate = PerfMeasureRate(UploadSubVBO); + mbPerSec = rate * SubSize / (1024.0 * 1024.0); + perf_printf(" glBufferSubDataARB(size = %d, VBOSize = %d): %.1f MB/sec\n", + SubSize, VBOSize, mbPerSec); + } + + for (sz = 0; Sizes[sz] < VBOSize; sz++) { + SubSize = Sizes[sz]; + rate = PerfMeasureRate(BatchUploadSubVBO); + mbPerSec = rate * SubSize / (1024.0 * 1024.0); + perf_printf(" glBufferSubDataARB(size = %d, VBOSize = %d), batched: %.1f MB/sec\n", + SubSize, VBOSize, mbPerSec); + } + + /* Create/Draw/Destroy + */ + for (sz = 0; Sizes[sz]; sz++) { + SubSize = VBOSize = Sizes[sz]; + rate = PerfMeasureRate(CreateDrawDestroyVBO); + mbPerSec = rate * VBOSize / (1024.0 * 1024.0); + perf_printf(" VBO Create/Draw/Destroy(size = %d): %.1f MB/sec, %.1f draws/sec\n", + VBOSize, mbPerSec, rate); + } + + exit(0); +} |