From: Ralf Jung Date: Sun, 31 Mar 2013 13:55:29 +0000 (+0200) Subject: add options to conrol presentation and clear behaviour X-Git-Url: https://git.ralfj.de/gltest.git/commitdiff_plain/21689b45f8d7e28bd6be565758bec0205abb8416?ds=sidebyside add options to conrol presentation and clear behaviour --- diff --git a/gltest.cpp b/gltest.cpp index 8d296a3..0cae932 100644 --- a/gltest.cpp +++ b/gltest.cpp @@ -15,13 +15,13 @@ namespace po = boost::program_options; #include "glwindow.h" #if defined(USE_GLX) #include "glxbackend.h" -GLBackend *createGLBackend() +static GLBackend *createGLBackend() { return new GLXBackend(); } #elif defined(USE_EGL) #include "eglbackend.h" -GLBackend *createGLBackend() +static GLBackend *createGLBackend() { return new EGLBackend(); } @@ -30,12 +30,12 @@ GLBackend *createGLBackend() #endif // configuration -const GLfloat boxWidth = 0.045f; -const GLfloat boxSpeed = 1.25f; // per second +static const GLfloat boxWidth = 0.045f; +static const GLfloat boxSpeed = 1.25f; // per second // profiler -const int numProfilerStates = 5; -const char *profilerStateNames[numProfilerStates] = { "Pre-Render", "Drawing", "Swapping", "Post-Render", "Outside renderer"}; +enum ProfilerState { statePreRender, stateDraw, statePresent, statePostRender, stateOutsideRender, numProfilerStates }; +static const char *profilerStateNames[numProfilerStates] = { "Pre-Render", "Drawing", "Presenting", "Post-Render", "Outside renderer"}; // utility functions static double getTime() @@ -53,7 +53,7 @@ static void drawRect(GLfloat x1, GLfloat y1, GLfloat x2, GLfloat y2) // the window class TearTestWindow : public GLWindow { public: - TearTestWindow() : GLWindow(XOpenDisplay(0), createGLBackend()), boxPos(0), boxDirection(1) + TearTestWindow(bool overdraw, bool copy) : GLWindow(XOpenDisplay(0), createGLBackend()), overdraw(overdraw), copy(copy), boxPos(0), boxDirection(1) {} void setSwapInterval(int i) { @@ -89,7 +89,7 @@ protected: glFlush(); } - void profilerTick(int nextState) + void profilerTick(ProfilerState nextState) { assert (nextState >= 0 && nextState < numProfilerStates); double time = getTime(); @@ -113,8 +113,9 @@ protected: } void renderGL() - { - profilerTick(0); + { + ////////////////////////////////////////////// + profilerTick(statePreRender); double time = getTime(); // anim double passedTime = time-lastFrame; @@ -130,37 +131,37 @@ protected: } } lastFrame = time; - // draw - //glFlush(); - profilerTick(1); - //glClear(GL_COLOR_BUFFER_BIT); - glBegin(GL_QUADS); - // clear manually - glColor3f(0.0f, 0.0f, 0.0f); - drawRect(0, 0, 1, 1); + ////////////////////////////////////////////// + profilerTick(stateDraw); + if (overdraw) { + glBegin(GL_QUADS); + // clear manually + glColor3f(0.0f, 0.0f, 0.0f); + drawRect(0, 0, 1, 1); + } + else { + glClear(GL_COLOR_BUFFER_BIT); + glBegin(GL_QUADS); + } glColor3f(0.8f, 1.0f, 0.75f); drawRect(boxPos, 0, boxPos+boxWidth, 1); glEnd(); - usleep(20*1000); - profilerTick(2); - getBackend()->swapBuffers(); -// glDrawBuffer(GL_FRONT); -// int xpos = 0; -// int ypos = 0; - //foreach (const QRect &r, region.rects()) { - // convert to OpenGL coordinates - //int y = displayHeight() - 0 - r.height(); -// glBitmap(0, 0, 0, 0, 0 - xpos, 0 - ypos, NULL); // not glRasterPos2f, see glxbackend.cpp -// xpos = 0; -// ypos = 0; -// glCopyPixels(0, 0, getWidth(), getHeight(), GL_COLOR); - //} -// glBitmap(0, 0, 0, 0, -xpos, -ypos, NULL); // move position back to 0,0 -// glDrawBuffer(GL_BACK); - profilerTick(3); + ////////////////////////////////////////////// + profilerTick(statePresent); + if (copy) { + glDrawBuffer(GL_FRONT); + glCopyPixels(0, 0, getWidth(), getHeight(), GL_COLOR); + glDrawBuffer(GL_BACK); + } + else { + getBackend()->swapBuffers(); + } + ////////////////////////////////////////////// + profilerTick(statePostRender); glFlush(); ++framect; - profilerTick(4); + ////////////////////////////////////////////// + profilerTick(stateOutsideRender); } virtual void handleKeyPress(KeySym key) @@ -173,6 +174,7 @@ protected: } private: + bool overdraw, copy; double lastFrame; GLfloat boxPos, boxDirection; // FPS @@ -190,6 +192,8 @@ int main(int argc, char ** argv) desc.add_options() ("help,h", "produce help message") ("swap-interval,i", po::value(), "set swap interval") + ("copy,c", "copy to front buffer (instead of performing a buffer swap)") + ("overdraw,o", "overdraw previous image (instead of calling glClear)") ; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm); @@ -201,7 +205,7 @@ int main(int argc, char ** argv) } // actual program - TearTestWindow w; + TearTestWindow w(vm.count("overdraw"), vm.count("copy")); w.open(800, 600); if (vm.count("swap-interval")) w.setSwapInterval(vm["swap-interval"].as());