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1 | /* |
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2 | * ---------------------------------------------------------------------- |
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3 | * PerfQuery.h: performance query class |
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4 | * It counts then number of pixels rendered on screen using |
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5 | * OpenGL occlusion query extension |
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6 | * |
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7 | * ====================================================================== |
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8 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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9 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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10 | * |
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11 | * Copyright (c) 2004-2006 Purdue Research Foundation |
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12 | * |
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13 | * See the file "license.terms" for information on usage and |
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14 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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15 | * ====================================================================== |
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16 | */ |
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17 | |
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18 | #ifndef _PERFQUERY_H_ |
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19 | #define _PERFQUERY_H_ |
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20 | |
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21 | #include <stdio.h> |
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22 | #include <GL/glew.h> |
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23 | |
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24 | #include "define.h" |
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25 | |
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26 | //check if occlusion query is supported |
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27 | static bool check_query_support(){ |
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28 | int bitsSupported = -1; |
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29 | glGetQueryivARB(GL_SAMPLES_PASSED_ARB, GL_QUERY_COUNTER_BITS_ARB, &bitsSupported); |
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30 | if(bitsSupported == 0) { |
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31 | fprintf(stderr, "occlusion query not supported!\n"); |
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32 | return false; |
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33 | } |
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34 | else{ |
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35 | fprintf(stderr, "Occlusion query with %d bits supported\n", bitsSupported); |
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36 | return true; |
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37 | } |
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38 | } |
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39 | |
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40 | class PerfQuery |
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41 | { |
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42 | |
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43 | public: |
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44 | NVISid id; |
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45 | int pixel; |
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46 | |
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47 | PerfQuery(); |
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48 | ~PerfQuery(); |
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49 | |
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50 | void enable(); //start counting how many pixels are rendered |
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51 | void disable(); //stop counting |
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52 | |
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53 | void reset(); //reset pixel count to 0; |
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54 | int get_pixel_count();//return current pixel count |
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55 | |
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56 | }; |
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57 | |
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58 | |
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59 | |
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60 | #endif |
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61 | |
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