1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | /* |
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3 | * ---------------------------------------------------------------------- |
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4 | * PerfQuery.h: performance query class |
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5 | * It counts then number of pixels rendered on screen using |
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6 | * OpenGL occlusion query extension |
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7 | * |
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8 | * ====================================================================== |
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9 | * AUTHOR: Wei Qiao <qiaow@purdue.edu> |
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10 | * Purdue Rendering and Perceptualization Lab (PURPL) |
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11 | * |
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12 | * Copyright (c) 2004-2013 HUBzero Foundation, LLC |
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13 | * |
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14 | * See the file "license.terms" for information on usage and |
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15 | * redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
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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 | |
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23 | #include <GL/glew.h> |
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24 | |
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25 | #include "Trace.h" |
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26 | |
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27 | namespace nv { |
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28 | |
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29 | class PerfQuery |
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30 | { |
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31 | public: |
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32 | PerfQuery(); |
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33 | ~PerfQuery(); |
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34 | |
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35 | void enable(); //start counting how many pixels are rendered |
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36 | void disable(); //stop counting |
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37 | |
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38 | void reset() |
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39 | { |
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40 | pixel = 0; |
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41 | } |
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42 | |
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43 | int getPixelCount() |
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44 | { |
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45 | return pixel; //return current pixel count |
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46 | } |
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47 | |
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48 | static bool checkQuerySupport(); |
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49 | |
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50 | GLuint id; |
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51 | int pixel; |
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52 | }; |
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53 | |
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54 | //check if occlusion query is supported |
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55 | inline bool PerfQuery::checkQuerySupport() |
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56 | { |
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57 | if (!GLEW_ARB_occlusion_query) { |
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58 | TRACE("ARB_occlusion_query extension not supported"); |
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59 | return false; |
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60 | } |
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61 | int bitsSupported = -1; |
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62 | glGetQueryivARB(GL_SAMPLES_PASSED_ARB, GL_QUERY_COUNTER_BITS_ARB, |
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63 | &bitsSupported); |
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64 | if (bitsSupported == 0) { |
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65 | TRACE("occlusion query not supported!"); |
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66 | return false; |
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67 | } else { |
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68 | TRACE("Occlusion query with %d bits supported", bitsSupported); |
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69 | return true; |
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70 | } |
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71 | } |
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72 | |
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73 | } |
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74 | |
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75 | #endif |
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76 | |
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