106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file glOcclusionQueryContext_src.cxx
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* @author drose
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* @date 2006-03-27
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*/
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#include "pnotify.h"
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#include "dcast.h"
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#include "lightMutexHolder.h"
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#include "pStatTimer.h"
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#ifndef OPENGLES // Occlusion queries not supported by OpenGL ES.
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TypeHandle CLP(OcclusionQueryContext)::_type_handle;
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/**
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*
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*/
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CLP(OcclusionQueryContext)::
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~CLP(OcclusionQueryContext)() {
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if (_index != 0) {
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// Tell the GSG to recycle this index when it gets around to it.
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CLP(GraphicsStateGuardian) *glgsg;
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DCAST_INTO_V(glgsg, _gsg);
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LightMutexHolder holder(glgsg->_lock);
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glgsg->_deleted_queries.push_back(_index);
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_index = 0;
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}
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}
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/**
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* Returns true if the query's answer is ready, false otherwise. If this
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* returns false, the application must continue to poll until it returns true.
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*
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* It is only valid to call this from the draw thread.
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*/
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bool CLP(OcclusionQueryContext)::
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is_answer_ready() const {
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CLP(GraphicsStateGuardian) *glgsg;
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DCAST_INTO_R(glgsg, _gsg, false);
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GLuint result;
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glgsg->_glGetQueryObjectuiv(_index, GL_QUERY_RESULT_AVAILABLE, &result);
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if (GLCAT.is_debug()) {
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GLCAT.debug()
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<< "occlusion query " << (int)_index << " ready = " << (int)result << "\n";
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}
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return (result != 0);
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}
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/**
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* Requests the graphics engine to expedite the pending answer--the
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* application is now waiting until the answer is ready.
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*
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* It is only valid to call this from the draw thread.
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*/
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void CLP(OcclusionQueryContext)::
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waiting_for_answer() {
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PStatTimer timer(GraphicsStateGuardian::_wait_occlusion_pcollector);
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glFlush();
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}
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/**
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* Returns the number of fragments (pixels) of the specified geometry that
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* passed the depth test. If is_answer_ready() did not return true, this
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* function may block before it returns.
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*
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* It is only valid to call this from the draw thread.
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*/
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int CLP(OcclusionQueryContext)::
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get_num_fragments() const {
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CLP(GraphicsStateGuardian) *glgsg;
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DCAST_INTO_R(glgsg, _gsg, 0);
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GLuint result;
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glgsg->_glGetQueryObjectuiv(_index, GL_QUERY_RESULT_AVAILABLE, &result);
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if (result) {
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// The answer is ready now.
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glgsg->_glGetQueryObjectuiv(_index, GL_QUERY_RESULT, &result);
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} else {
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// The answer is not ready; this call will block.
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PStatTimer timer(GraphicsStateGuardian::_wait_occlusion_pcollector);
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glgsg->_glGetQueryObjectuiv(_index, GL_QUERY_RESULT, &result);
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}
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if (GLCAT.is_debug()) {
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GLCAT.debug()
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<< "occlusion query " << (int)_index << " reports " << (int)result
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<< " fragments.\n";
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}
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glgsg->report_my_gl_errors();
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return result;
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}
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#endif // OPENGLES
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