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dramatic fps drop when using transparent texture


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#21 fip   Members   -  Reputation: 147

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Posted 13 December 2012 - 09:24 AM

Hi again,

more testing:
- ive added
[source lang="cpp"]SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1);[/source]
does not have any effect. I think it should be enough with SDL_OPENGL but just in case.

- i ve run the executable on a notebook with only one GPU and i keep getting the "GDI generic" for GL_RENDERER.
So maybe it's not an issue of having dual gpus, furthermore in case it was using the intel HD integrated graphics card i should be getting "Intel" as the GL_VENDOR right?



OK, one problem here is that you're using SDL_Delay to control framerate.



It's just some code i grabbed from the internet. I dont care right now about this.

For your GL context problem, I'll have a look over your code later on today and see if I can spot anything (assuming someone else doesn't come up with the solution before then).

Thanks for your time, this is the problem i want to fix!!

Sponsor:

#22 fip   Members   -  Reputation: 147

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Posted 13 December 2012 - 09:32 AM

I tested this other SDL+Opengl code and still get GDI generic for GL_RENDERER.

[source lang="cpp"]#include <stdlib.h>#include <stdio.h>#include <string.h>#include <math.h>#include "SDL.h"#ifdef __MACOS__#define HAVE_OPENGL#endif#define HAVE_OPENGL#ifdef HAVE_OPENGL#include "SDL_opengl.h"/* Undefine this if you want a flat cube instead of a rainbow cube */#define SHADED_CUBE/* Define this to be the name of the logo image to use with -logo */#define LOGO_FILE "icon.bmp"/* The SDL_OPENGLBLIT interface is deprecated. The code is still available for benchmark purposes though.*/static SDL_bool USE_DEPRECATED_OPENGLBLIT = SDL_FALSE;static SDL_Surface *global_image = NULL;static GLuint global_texture = 0;static GLuint cursor_texture = 0;/**********************************************************************/void HotKey_ToggleFullScreen(void){ SDL_Surface *screen; screen = SDL_GetVideoSurface(); if ( SDL_WM_ToggleFullScreen(screen) ) { printf("Toggled fullscreen mode - now %s\n", (screen->flags&SDL_FULLSCREEN) ? "fullscreen" : "windowed"); } else { printf("Unable to toggle fullscreen mode\n"); }}void HotKey_ToggleGrab(void){ SDL_GrabMode mode; printf("Ctrl-G: toggling input grab!\n"); mode = SDL_WM_GrabInput(SDL_GRAB_QUERY); if ( mode == SDL_GRAB_ON ) { printf("Grab was on\n"); } else { printf("Grab was off\n"); } mode = SDL_WM_GrabInput(!mode); if ( mode == SDL_GRAB_ON ) { printf("Grab is now on\n"); } else { printf("Grab is now off\n"); }}void HotKey_Iconify(void){ printf("Ctrl-Z: iconifying window!\n"); SDL_WM_IconifyWindow();}int HandleEvent(SDL_Event *event){ int done; done = 0; switch( event->type ) { case SDL_ACTIVEEVENT: /* See what happened */ printf( "app %s ", event->active.gain ? "gained" : "lost" ); if ( event->active.state & SDL_APPACTIVE ) { printf( "active " ); } else if ( event->active.state & SDL_APPMOUSEFOCUS ) { printf( "mouse " ); } else if ( event->active.state & SDL_APPINPUTFOCUS ) { printf( "input " ); } printf( "focus\n" ); break; case SDL_KEYDOWN: if ( event->key.keysym.sym == SDLK_ESCAPE ) { done = 1; } if ( (event->key.keysym.sym == SDLK_g) && (event->key.keysym.mod & KMOD_CTRL) ) { HotKey_ToggleGrab(); } if ( (event->key.keysym.sym == SDLK_z) && (event->key.keysym.mod & KMOD_CTRL) ) { HotKey_Iconify(); } if ( (event->key.keysym.sym == SDLK_RETURN) && (event->key.keysym.mod & KMOD_ALT) ) { HotKey_ToggleFullScreen(); } printf("key '%s' pressed\n", SDL_GetKeyName(event->key.keysym.sym)); break; case SDL_QUIT: done = 1; break; } return(done);}void SDL_GL_Enter2DMode(){ SDL_Surface *screen = SDL_GetVideoSurface(); /* Note, there may be other things you need to change, depending on how you have your OpenGL state set up. */ glPushAttrib(GL_ENABLE_BIT); glDisable(GL_DEPTH_TEST); glDisable(GL_CULL_FACE); glEnable(GL_TEXTURE_2D); /* This allows alpha blending of 2D textures with the scene */ glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glViewport(0, 0, screen->w, screen->h); glMatrixMode(GL_PROJECTION); glPushMatrix(); glLoadIdentity(); glOrtho(0.0, (GLdouble)screen->w, (GLdouble)screen->h, 0.0, 0.0, 1.0); glMatrixMode(GL_MODELVIEW); glPushMatrix(); glLoadIdentity(); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);}void SDL_GL_Leave2DMode(){ glMatrixMode(GL_MODELVIEW); glPopMatrix(); glMatrixMode(GL_PROJECTION); glPopMatrix(); glPopAttrib();}/* Quick utility function for texture creation */static int power_of_two(int input){ int value = 1; while ( value < input ) { value <<= 1; } return value;}GLuint SDL_GL_LoadTexture(SDL_Surface *surface, GLfloat *texcoord){ GLuint texture; int w, h; SDL_Surface *image; SDL_Rect area; Uint32 saved_flags; Uint8 saved_alpha; /* Use the surface width and height expanded to powers of 2 */ w = power_of_two(surface->w); h = power_of_two(surface->h); texcoord[0] = 0.0f; /* Min X */ texcoord[1] = 0.0f; /* Min Y */ texcoord[2] = (GLfloat)surface->w / w; /* Max X */ texcoord[3] = (GLfloat)surface->h / h; /* Max Y */ image = SDL_CreateRGBSurface( SDL_SWSURFACE, w, h, 32,#if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000#else 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF#endif ); if ( image == NULL ) { return 0; } /* Save the alpha blending attributes */ saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK); saved_alpha = surface->format->alpha; if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { SDL_SetAlpha(surface, 0, 0); } /* Copy the surface into the GL texture image */ area.x = 0; area.y = 0; area.w = surface->w; area.h = surface->h; SDL_BlitSurface(surface, &area, image, &area); /* Restore the alpha blending attributes */ if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { SDL_SetAlpha(surface, saved_flags, saved_alpha); } /* Create an OpenGL texture for the image */ glGenTextures(1, &texture); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, image->pixels); SDL_FreeSurface(image); /* No longer needed */ return texture;}void DrawLogoCursor(void){ static GLfloat texMinX, texMinY; static GLfloat texMaxX, texMaxY; static int w, h; int x, y; if ( ! cursor_texture ) { SDL_Surface *image; GLfloat texcoord[4]; /* Load the image (could use SDL_image library here) */ image = SDL_LoadBMP(LOGO_FILE); if ( image == NULL ) { return; } w = image->w; h = image->h; /* Convert the image into an OpenGL texture */ cursor_texture = SDL_GL_LoadTexture(image, texcoord); /* Make texture coordinates easy to understand */ texMinX = texcoord[0]; texMinY = texcoord[1]; texMaxX = texcoord[2]; texMaxY = texcoord[3]; /* We don't need the original image anymore */ SDL_FreeSurface(image); /* Make sure that the texture conversion is okay */ if ( ! cursor_texture ) { return; } } /* Move the image around */ SDL_GetMouseState(&x, &y); x -= w/2; y -= h/2; /* Show the image on the screen */ SDL_GL_Enter2DMode(); glBindTexture(GL_TEXTURE_2D, cursor_texture); glBegin(GL_TRIANGLE_STRIP); glTexCoord2f(texMinX, texMinY); glVertex2i(x, y ); glTexCoord2f(texMaxX, texMinY); glVertex2i(x+w, y ); glTexCoord2f(texMinX, texMaxY); glVertex2i(x, y+h); glTexCoord2f(texMaxX, texMaxY); glVertex2i(x+w, y+h); glEnd(); SDL_GL_Leave2DMode();}void DrawLogoTexture(void){ static GLfloat texMinX, texMinY; static GLfloat texMaxX, texMaxY; static int x = 0; static int y = 0; static int w, h; static int delta_x = 1; static int delta_y = 1; SDL_Surface *screen = SDL_GetVideoSurface(); if ( ! global_texture ) { SDL_Surface *image; GLfloat texcoord[4]; /* Load the image (could use SDL_image library here) */ image = SDL_LoadBMP(LOGO_FILE); if ( image == NULL ) { return; } w = image->w; h = image->h; /* Convert the image into an OpenGL texture */ global_texture = SDL_GL_LoadTexture(image, texcoord); /* Make texture coordinates easy to understand */ texMinX = texcoord[0]; texMinY = texcoord[1]; texMaxX = texcoord[2]; texMaxY = texcoord[3]; /* We don't need the original image anymore */ SDL_FreeSurface(image); /* Make sure that the texture conversion is okay */ if ( ! global_texture ) { return; } } /* Move the image around */ x += delta_x; if ( x < 0 ) { x = 0; delta_x = -delta_x; } else if ( (x+w) > screen->w ) { x = screen->w-w; delta_x = -delta_x; } y += delta_y; if ( y < 0 ) { y = 0; delta_y = -delta_y; } else if ( (y+h) > screen->h ) { y = screen->h-h; delta_y = -delta_y; } /* Show the image on the screen */ SDL_GL_Enter2DMode(); glBindTexture(GL_TEXTURE_2D, global_texture); glBegin(GL_TRIANGLE_STRIP); glTexCoord2f(texMinX, texMinY); glVertex2i(x, y ); glTexCoord2f(texMaxX, texMinY); glVertex2i(x+w, y ); glTexCoord2f(texMinX, texMaxY); glVertex2i(x, y+h); glTexCoord2f(texMaxX, texMaxY); glVertex2i(x+w, y+h); glEnd(); SDL_GL_Leave2DMode();}/* This code is deprecated, but available for speed comparisons */void DrawLogoBlit(void){ static int x = 0; static int y = 0; static int w, h; static int delta_x = 1; static int delta_y = 1; SDL_Rect dst; SDL_Surface *screen = SDL_GetVideoSurface(); if ( global_image == NULL ) { SDL_Surface *temp; /* Load the image (could use SDL_image library here) */ temp = SDL_LoadBMP(LOGO_FILE); if ( temp == NULL ) { return; } w = temp->w; h = temp->h; /* Convert the image into the screen format */ global_image = SDL_CreateRGBSurface( SDL_SWSURFACE, w, h, screen->format->BitsPerPixel, screen->format->Rmask, screen->format->Gmask, screen->format->Bmask, screen->format->Amask); if ( global_image ) { SDL_BlitSurface(temp, NULL, global_image, NULL); } SDL_FreeSurface(temp); /* Make sure that the texture conversion is okay */ if ( ! global_image ) { return; } } /* Move the image around Note that we do not clear the old position. This is because we perform a glClear() which clears the framebuffer and then only update the new area. Note that you can also achieve interesting effects by modifying the screen surface alpha channel. It's set to 255 by default.. */ x += delta_x; if ( x < 0 ) { x = 0; delta_x = -delta_x; } else if ( (x+w) > screen->w ) { x = screen->w-w; delta_x = -delta_x; } y += delta_y; if ( y < 0 ) { y = 0; delta_y = -delta_y; } else if ( (y+h) > screen->h ) { y = screen->h-h; delta_y = -delta_y; } dst.x = x; dst.y = y; dst.w = w; dst.h = h; SDL_BlitSurface(global_image, NULL, screen, &dst); /* Show the image on the screen */ SDL_UpdateRects(screen, 1, &dst);}int RunGLTest( int argc, char* argv[], int logo, int logocursor, int slowly, int bpp, float gamma, int noframe, int fsaa, int sync, int accel ){ int i; int rgb_size[3]; int w = 640; int h = 480; int done = 0; int frames; Uint32 start_time, this_time; float color[8][3]= {{ 1.0, 1.0, 0.0}, { 1.0, 0.0, 0.0}, { 0.0, 0.0, 0.0}, { 0.0, 1.0, 0.0}, { 0.0, 1.0, 1.0}, { 1.0, 1.0, 1.0}, { 1.0, 0.0, 1.0}, { 0.0, 0.0, 1.0}}; float cube[8][3]= {{ 0.5, 0.5, -0.5}, { 0.5, -0.5, -0.5}, {-0.5, -0.5, -0.5}, {-0.5, 0.5, -0.5}, {-0.5, 0.5, 0.5}, { 0.5, 0.5, 0.5}, { 0.5, -0.5, 0.5}, {-0.5, -0.5, 0.5}}; Uint32 video_flags; int value; if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) { fprintf(stderr,"Couldn't initialize SDL: %s\n",SDL_GetError()); exit( 1 ); } /* See if we should detect the display depth */ if ( bpp == 0 ) { if ( SDL_GetVideoInfo()->vfmt->BitsPerPixel <= 8 ) { bpp = 8; } else { bpp = 16; /* More doesn't seem to work */ } } /* Set the flags we want to use for setting the video mode */ if ( logo && USE_DEPRECATED_OPENGLBLIT ) { video_flags = SDL_OPENGLBLIT; } else { video_flags = SDL_OPENGL; } for ( i=1; argv[i]; ++i ) { if ( strcmp(argv[i], "-fullscreen") == 0 ) { video_flags |= SDL_FULLSCREEN; } } if (noframe) { video_flags |= SDL_NOFRAME; } /* Initialize the display */ switch (bpp) { case 8: rgb_size[0] = 3; rgb_size[1] = 3; rgb_size[2] = 2; break; case 15: case 16: rgb_size[0] = 5; rgb_size[1] = 5; rgb_size[2] = 5; break; default: rgb_size[0] = 8; rgb_size[1] = 8; rgb_size[2] = 8; break; } SDL_GL_SetAttribute( SDL_GL_RED_SIZE, rgb_size[0] ); SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, rgb_size[1] ); SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, rgb_size[2] ); SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 ); SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 ); if ( fsaa ) { SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 ); SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, fsaa ); } if ( accel ) { SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 ); } if ( sync ) { SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 ); } else { SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 0 ); } if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) { fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError()); SDL_Quit(); exit(1); } printf("Screen BPP: %d\n", SDL_GetVideoSurface()->format->BitsPerPixel); printf("\n"); printf( "Vendor : %s\n", glGetString( GL_VENDOR ) ); printf( "Renderer : %s\n", glGetString( GL_RENDERER ) ); printf( "Version : %s\n", glGetString( GL_VERSION ) ); printf( "Extensions : %s\n", glGetString( GL_EXTENSIONS ) ); printf("\n"); SDL_GL_GetAttribute( SDL_GL_RED_SIZE, &value ); printf( "SDL_GL_RED_SIZE: requested %d, got %d\n", rgb_size[0],value); SDL_GL_GetAttribute( SDL_GL_GREEN_SIZE, &value ); printf( "SDL_GL_GREEN_SIZE: requested %d, got %d\n", rgb_size[1],value); SDL_GL_GetAttribute( SDL_GL_BLUE_SIZE, &value ); printf( "SDL_GL_BLUE_SIZE: requested %d, got %d\n", rgb_size[2],value); SDL_GL_GetAttribute( SDL_GL_DEPTH_SIZE, &value ); printf( "SDL_GL_DEPTH_SIZE: requested %d, got %d\n", bpp, value ); SDL_GL_GetAttribute( SDL_GL_DOUBLEBUFFER, &value ); printf( "SDL_GL_DOUBLEBUFFER: requested 1, got %d\n", value ); if ( fsaa ) { SDL_GL_GetAttribute( SDL_GL_MULTISAMPLEBUFFERS, &value ); printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value ); SDL_GL_GetAttribute( SDL_GL_MULTISAMPLESAMPLES, &value ); printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa, value ); } if ( accel ) { SDL_GL_GetAttribute( SDL_GL_ACCELERATED_VISUAL, &value ); printf( "SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value ); } if ( sync ) { SDL_GL_GetAttribute( SDL_GL_SWAP_CONTROL, &value ); printf( "SDL_GL_SWAP_CONTROL: requested 1, got %d\n", value ); } /* Set the window manager title bar */ SDL_WM_SetCaption( "SDL GL test", "testgl" ); /* Set the gamma for the window */ if ( gamma != 0.0 ) { SDL_SetGamma(gamma, gamma, gamma); } glViewport( 0, 0, w, h ); glMatrixMode( GL_PROJECTION ); glLoadIdentity( ); glOrtho( -2.0, 2.0, -2.0, 2.0, -20.0, 20.0 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity( ); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LESS); glShadeModel(GL_SMOOTH); /* Loop until done. */ start_time = SDL_GetTicks(); frames = 0; while( !done ) { GLenum gl_error; char* sdl_error; SDL_Event event; /* Do our drawing, too. */ glClearColor( 0.0, 0.0, 0.0, 1.0 ); glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glBegin( GL_QUADS );#ifdef SHADED_CUBE glColor3fv(color[0]); glVertex3fv(cube[0]); glColor3fv(color[1]); glVertex3fv(cube[1]); glColor3fv(color[2]); glVertex3fv(cube[2]); glColor3fv(color[3]); glVertex3fv(cube[3]); glColor3fv(color[3]); glVertex3fv(cube[3]); glColor3fv(color[4]); glVertex3fv(cube[4]); glColor3fv(color[7]); glVertex3fv(cube[7]); glColor3fv(color[2]); glVertex3fv(cube[2]); glColor3fv(color[0]); glVertex3fv(cube[0]); glColor3fv(color[5]); glVertex3fv(cube[5]); glColor3fv(color[6]); glVertex3fv(cube[6]); glColor3fv(color[1]); glVertex3fv(cube[1]); glColor3fv(color[5]); glVertex3fv(cube[5]); glColor3fv(color[4]); glVertex3fv(cube[4]); glColor3fv(color[7]); glVertex3fv(cube[7]); glColor3fv(color[6]); glVertex3fv(cube[6]); glColor3fv(color[5]); glVertex3fv(cube[5]); glColor3fv(color[0]); glVertex3fv(cube[0]); glColor3fv(color[3]); glVertex3fv(cube[3]); glColor3fv(color[4]); glVertex3fv(cube[4]); glColor3fv(color[6]); glVertex3fv(cube[6]); glColor3fv(color[1]); glVertex3fv(cube[1]); glColor3fv(color[2]); glVertex3fv(cube[2]); glColor3fv(color[7]); glVertex3fv(cube[7]);#else /* flat cube */ glColor3f(1.0, 0.0, 0.0); glVertex3fv(cube[0]); glVertex3fv(cube[1]); glVertex3fv(cube[2]); glVertex3fv(cube[3]); glColor3f(0.0, 1.0, 0.0); glVertex3fv(cube[3]); glVertex3fv(cube[4]); glVertex3fv(cube[7]); glVertex3fv(cube[2]); glColor3f(0.0, 0.0, 1.0); glVertex3fv(cube[0]); glVertex3fv(cube[5]); glVertex3fv(cube[6]); glVertex3fv(cube[1]); glColor3f(0.0, 1.0, 1.0); glVertex3fv(cube[5]); glVertex3fv(cube[4]); glVertex3fv(cube[7]); glVertex3fv(cube[6]); glColor3f(1.0, 1.0, 0.0); glVertex3fv(cube[5]); glVertex3fv(cube[0]); glVertex3fv(cube[3]); glVertex3fv(cube[4]); glColor3f(1.0, 0.0, 1.0); glVertex3fv(cube[6]); glVertex3fv(cube[1]); glVertex3fv(cube[2]); glVertex3fv(cube[7]);#endif /* SHADED_CUBE */ glEnd( ); glMatrixMode(GL_MODELVIEW); glRotatef(5.0, 1.0, 1.0, 1.0); /* Draw 2D logo onto the 3D display */ if ( logo ) { if ( USE_DEPRECATED_OPENGLBLIT ) { DrawLogoBlit(); } else { DrawLogoTexture(); } } if ( logocursor ) { DrawLogoCursor(); } SDL_GL_SwapBuffers( ); /* Check for error conditions. */ gl_error = glGetError( ); if( gl_error != GL_NO_ERROR ) { fprintf( stderr, "testgl: OpenGL error: %d\n", gl_error ); } sdl_error = SDL_GetError( ); if( sdl_error[0] != '\0' ) { fprintf(stderr, "testgl: SDL error '%s'\n", sdl_error); SDL_ClearError(); } /* Allow the user to see what's happening */ if ( slowly ) { SDL_Delay( 20 ); } /* Check if there's a pending event. */ while( SDL_PollEvent( &event ) ) { done = HandleEvent(&event); } ++frames; } /* Print out the frames per second */ this_time = SDL_GetTicks(); if ( this_time != start_time ) { printf("%2.2f FPS\n", ((float)frames/(this_time-start_time))*1000.0); } if ( global_image ) { SDL_FreeSurface(global_image); global_image = NULL; } if ( global_texture ) { glDeleteTextures( 1, &global_texture ); global_texture = 0; } if ( cursor_texture ) { glDeleteTextures( 1, &cursor_texture ); cursor_texture = 0; } /* Destroy our GL context, etc. */ SDL_Quit( ); return(0);}int main(int argc, char *argv[]){ int i, logo, logocursor = 0; int numtests; int bpp = 0; int slowly; float gamma = 0.0; int noframe = 0; int fsaa = 0; int accel = 0; int sync = 0; logo = 0; slowly = 0; numtests = 1; for ( i=1; argv[i]; ++i ) { if ( strcmp(argv[i], "-twice") == 0 ) { ++numtests; } if ( strcmp(argv[i], "-logo") == 0 ) { logo = 1; USE_DEPRECATED_OPENGLBLIT = SDL_FALSE; } if ( strcmp(argv[i], "-logoblit") == 0 ) { logo = 1; USE_DEPRECATED_OPENGLBLIT = SDL_TRUE; } if ( strcmp(argv[i], "-logocursor") == 0 ) { logocursor = 1; } if ( strcmp(argv[i], "-slow") == 0 ) { slowly = 1; } if ( strcmp(argv[i], "-bpp") == 0 ) { bpp = atoi(argv[++i]); } if ( strcmp(argv[i], "-gamma") == 0 ) { gamma = (float)atof(argv[++i]); } if ( strcmp(argv[i], "-noframe") == 0 ) { noframe = 1; } if ( strcmp(argv[i], "-fsaa") == 0 ) { ++fsaa; } if ( strcmp(argv[i], "-accel") == 0 ) { ++accel; } if ( strcmp(argv[i], "-sync") == 0 ) { ++sync; } if ( strncmp(argv[i], "-h", 2) == 0 ) { printf("Usage: %s [-twice] [-logo] [-logocursor] [-slow] [-bpp n] [-gamma n] [-noframe] [-fsaa] [-accel] [-sync] [-fullscreen]\n", argv[0]); exit(0); } } for ( i=0; i<numtests; ++i ) { RunGLTest(argc, argv, logo, logocursor, slowly, bpp, gamma, noframe, fsaa, sync, accel); } return 0;}#else /* HAVE_OPENGL */int main(int argc, char *argv[]){ printf("No OpenGL support on this system\n"); return 1;}#endif /* HAVE_OPENGL */[/source]

Can someone try to run this code and see what do you get for GL_RENDERER?

I want to know if the problem is in the code or it's in my laptop configuration somehow.

#23 mhagain   Crossbones+   -  Reputation: 8129

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Posted 13 December 2012 - 11:14 AM

Here's what I get on one machine:

Vendor : ATI Technologies Inc.
Renderer : AMD Radeon HD 6450
Version : 4.2.11931 Compatibility Profile Context
SDL_GL_RED_SIZE: requested 5, got 8
SDL_GL_GREEN_SIZE: requested 5, got 8
SDL_GL_BLUE_SIZE: requested 5, got 8
SDL_GL_DEPTH_SIZE: requested 16, got 24
SDL_GL_DOUBLEBUFFER: requested 1, got 1


What looks possible here is that you're requesting default modes that may not be available in hardware-accelerated versions. 16-bit modes are really really old these days (the last video card that didn't support 32-bit colour was the Voodoo 3) and there should be no reason to go looking for one - try bumping RGB to 8/8/8 and see what that gets you.

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.


#24 kunos   Crossbones+   -  Reputation: 2207

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Posted 13 December 2012 - 11:19 AM

the most likely cause is that you don't have a driver from nvidia. Go on the nvidia website, download and install your driver and enjoy hardware accelerated OpenGL.
Stefano Casillo
Lead Programmer
TWITTER: @KunosStefano
AssettoCorsa - netKar PRO - Kunos Simulazioni

#25 fip   Members   -  Reputation: 147

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Posted 13 December 2012 - 11:29 AM

Hi mhagain,
Here is what i get after increasing the depth size to 24:

Screen BPP: 24
Vendor : Microsoft Corporation
Renderer : GDI Generic
Version : 1.1.0
Extensions : GL_WIN_swap_hint GL_EXT_bgr
SDL_GL_RED_SIZE: requested 8, got 8
SDL_GL_GREEN_SIZE: requested 8, got 8
SDL_GL_BLUE_SIZE: requested 8, got 8
SDL_GL_DEPTH_SIZE: requested 24, got 32
SDL_GL_DOUBLEBUFFER: requested 1, got 1


I think i have spotted the problem.
In the official opengl documentation site ive found this http://www.opengl.org/archives/resources/faq/technical/mswindows.htm specially the point "5.030 How do I enable and disable hardware rendering on a Wintel card?"
It says that hardware acceleration depends on choosing a right PIXEL FORMAT. Now is it possible to do this when you are using GLUT? Which config do i need when using SDL to get hardware acceleration?

#26 fip   Members   -  Reputation: 147

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Posted 13 December 2012 - 11:38 AM

the most likely cause is that you don't have a driver from nvidia. Go on the nvidia website, download and install your driver and enjoy hardware accelerated OpenGL.


Hi Kunos,
the thing is, i already have a driver from nvidia installed. And if i run code that creates rendering context for windows it runs in the gpu!! The problem has to be with choosing the right pixel format. But ill try to download latest drivers from nvidia anyway to check it.

#27 mhagain   Crossbones+   -  Reputation: 8129

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Posted 13 December 2012 - 11:46 AM

Both GLUT and SDL should automatically prefer to give you a hardware accelerated pixel format if one is available.

Looking at http://sdl.beuc.net/sdl.wiki/SDL_GLattr I see that SDL_GL_SetAttribute has an SDL_GL_ACCELERATED_VISUAL attribute available, so you can try using that.

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.


#28 fip   Members   -  Reputation: 147

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Posted 13 December 2012 - 12:22 PM

Looking at http://sdl.beuc.net/...wiki/SDL_GLattr I see that SDL_GL_SetAttribute has an SDL_GL_ACCELERATED_VISUAL attribute available, so you can try using that.


Already tried, nothing new :(. But the strangest thing is the output:

Screen BPP: 24

Vendor : Microsoft Corporation
Renderer : GDI Generic
Version : 1.1.0
Extensions : GL_WIN_swap_hint GL_EXT_bgra GL_E

SDL_GL_RED_SIZE: requested 8, got 8
SDL_GL_GREEN_SIZE: requested 8, got 8
SDL_GL_BLUE_SIZE: requested 8, got 8
SDL_GL_DEPTH_SIZE: requested 24, got 32
SDL_GL_DOUBLEBUFFER: requested 1, got 1
SDL_GL_ACCELERATED_VISUAL: requested 1, got 1 !!!!!!

Although it says "got 1" for SDL_GL_ACCELERATED_VISUAL i dont have hardware acceleration... :S

Edited by fip, 13 December 2012 - 12:29 PM.


#29 slicer4ever   Crossbones+   -  Reputation: 3942

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Posted 13 December 2012 - 03:34 PM

you said that lesson 1 of the nehe tutorials does give you an hardware accelerated context.

looking at the tutorial, it seems to specify 16 BPP(doesn't specify bits per color component), and a 16 bit z-buffer.

don't know if that will help, but perhaps we should step back and see why that works, but sdl does not.

i've attached a program i wrote to test your video settings, tell me if it still gives you an generic rendering context.

Attached Files


Edited by slicer4ever, 13 December 2012 - 04:23 PM.

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#30 fip   Members   -  Reputation: 147

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Posted 14 December 2012 - 04:22 AM

you said that lesson 1 of the nehe tutorials does give you an hardware accelerated context.

looking at the tutorial, it seems to specify 16 BPP(doesn't specify bits per color component), and a 16 bit z-buffer.

don't know if that will help, but perhaps we should step back and see why that works, but sdl does not.


Yesterday i was playing a bit with the code that creates an accelerated rendering context changing the SUPPORT_OPENGL feature as well as the pixel format to PDF_FORMAT_GENERIC and i wasnt still getting HW ACCELERATION, i ll keep messing with it til i find a way to disable hardware acceleration.
That may be a way to investigate yes.

i've attached a program i wrote to test your video settings, tell me if it still gives you an generic rendering context.


Thanks, I ll try it as soon as i can.

Edited by fip, 14 December 2012 - 04:24 AM.


#31 fip   Members   -  Reputation: 147

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Posted 14 December 2012 - 12:35 PM

i've attached a program i wrote to test your video settings, tell me if it still gives you an generic rendering context.


Hi slicer4ever, with your program i do get hardware acceleration!!! This program is running on my gpu.
Here is the output

VIDEO CONTEXT INFORMATION
VENDOR: NVIDIA Corporation
RENDER: GeForce GT555M/PCIe/SSE2
VERSION: 4.2.0
COLOR BITS: 32
DEPTH BITS: 24

Can you tell me what did you use to create the window?

Edited by fip, 14 December 2012 - 12:35 PM.


#32 slicer4ever   Crossbones+   -  Reputation: 3942

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Posted 14 December 2012 - 05:12 PM

ok, so i've dug through sdl to figure out how it initializes the pfd, and similar things, and try these settings:
SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 0); //Changed!
    SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 0 );  //Changed!
    SDL_GL_SetAttribute( SDL_GL_BUFFER_SIZE, 32); //Added!
    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 24 ); //Changed!
    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1 );
    if ( fsaa ) {
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLEBUFFERS, 1 );
	    SDL_GL_SetAttribute( SDL_GL_MULTISAMPLESAMPLES, fsaa );
    }
    if ( accel ) {
	    SDL_GL_SetAttribute( SDL_GL_ACCELERATED_VISUAL, 1 );
    }
    if ( sync ) {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 1 );
    } else {
	    SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 0 );
    }
    if ( SDL_SetVideoMode( w, h, bpp, video_flags ) == NULL ) {
	    fprintf(stderr, "Couldn't set GL mode: %s\n", SDL_GetError());
	    SDL_Quit();
	    exit(1);
    }
their is one other thing i'm curiose about, after looking through the code, but let's try this first.
also, sorry about the late response.

Edited by slicer4ever, 14 December 2012 - 05:13 PM.

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#33 fip   Members   -  Reputation: 147

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Posted 15 December 2012 - 02:50 AM

Hi,
thanks for the response.
ive made the changes you suggested and still doesnt get HW acceleration. Ive also modified the "bpp" bits per pixel parameter and set it to 0 and get the same result i get by default 8 bpp.

So nothing changed. You want me to try anything else?

#34 slicer4ever   Crossbones+   -  Reputation: 3942

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Posted 15 December 2012 - 03:46 AM

hmm, this is a perplexing problem, looking at sdl's source, it does a few things differently then my engine for creating a window/video context, but i don't see why this should cause you not to receive a hardware context.

i'm going to assume you are capable of compiling SDL, if not respond here and i'll see if i can't compile a binary for you with the changes.

note that i'm working with SDL-1.2.15(which a quick look at libsdl.org appears to be still the current version.)

so, my suspicion is that wglChoosePixelFormatARB is the culprit(or at least a parameter to it is causing the problem).

so let's comment out wglChoosePixelFormatARB, and use the default pixel format.
in SDL_wingl.c (src/video/wincommon/), comment lines 147-157.

this should be sufficient since it only uses the arb method if it's available for use(and i'm assuming it is available on most modern hardware), and defaults back to the regular PFD method instead.

so compile sdl, and run the test again, if this creates a hardware context, then it would appear this is the problem(or at least one of the parameter's it recieves creates a bad context). if not, i'm not really certain what the problem is, i'm no guru for sdl's internals, but by the look of things it should be similar to how i do things in my engine.
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#35 fip   Members   -  Reputation: 147

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Posted 15 December 2012 - 09:34 AM

Hi slicer4ever,

I would rather prefer if u could provide me with the modified SDL library for x86 :) as im not very used to compile libraries with visual studio.

#36 slicer4ever   Crossbones+   -  Reputation: 3942

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Posted 15 December 2012 - 05:00 PM

alright, i've compiled the changes:

http://www.sendspace.com/file/6vjaty

i also disabled directX since i don't have the sdk installed, and we arn't using directX, so i don't think it should be a problem.

(note the *D variants are debug versions)

Edited by slicer4ever, 15 December 2012 - 05:01 PM.

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#37 fip   Members   -  Reputation: 147

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Posted 16 December 2012 - 05:46 AM

Hi, ive replaced SDL.lib and SDLmain.lib in release mode and this is what i get with one of the code examples:

Screen BPP: 24
Vendor : Microsoft Corporation
Renderer : GDI Generic
Version : 1.1.0
Extensions : GL_WIN_swap_hint GL_EXT_bgra GL_EXT_paletted_texture
SDL_GL_RED_SIZE: requested 8, got 8
SDL_GL_GREEN_SIZE: requested 8, got 8
SDL_GL_BLUE_SIZE: requested 8, got 8
SDL_GL_DEPTH_SIZE: requested 24, got 32
SDL_GL_DOUBLEBUFFER: requested 1, got 1
SDL_GL_ACCELERATED_VISUAL: requested 1, got 1

still no hw acceleration.....

i dont know if i should ask in the nvidia forums or rather in the dell xps forums as it's more related to my computer configuration....

Do you have any other idea?

Edited by fip, 16 December 2012 - 05:47 AM.


#38 slicer4ever   Crossbones+   -  Reputation: 3942

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Posted 16 December 2012 - 07:38 AM

it defiantly would be a good point to post in nvidia forums, i'm finding it difficult to successfully follow SDL's init pathways(so many IFDef's for different OS's/config flags =-/) from what i can tell, it's doing pretty much a 1:1(or very near anyways) with my own engine's window creation code, this is assuming that i'm following the correct config flags.

anyway, i'm going to post my window creation code(cleaned up to work as a stand-alone function):


unsigned char CreateVideoContextWindows(unsigned int BorderFlag=WS_OVERLAPPEDWINDOW, unsigned int BorderFlagEx=WS_EX_APPWINDOW|WS_EX_WINDOWEDGE, const char *ClassName, unsigned char StencilBits, unsigned char AccumBits, unsigned char DepthBits, unsigned char ColorBits){
unsigned int PixelFormat=0;
HINSTANCE m_HInstance = GetModuleHandle(0x0);
HWND m_HWnd = 0x0;
HDC m_HDc = 0x0;
HGLRC m_HGlrc = 0x0;
int m_x = 0;
int m_y = 0;
WNDCLASS WndClass={CS_HREDRAW|CS_VREDRAW|CS_OWNDC, QWWindowsProc, 0, 0, m_HInstance, LoadIcon(0x0, IDI_WINLOGO), LoadCursor(0x0, IDC_ARROW),0x0, 0x0, ClassName};
if(!RegisterClass(&WndClass)){
  MessageBox(NULL, "Error: 'RegisterClass'", "ERROR", MB_OK|MB_ICONEXCLAMATION);
  return 0;
}
RECT WndRect={0, 0, m_Width, m_Height};
AdjustWindowRectEx(&WndRect, BorderFlag, 0, BorderFlagEx);
if(!(m_HWnd = CreateWindowEx(BorderFlagEx, ClassName, m_Title, WS_CLIPSIBLINGS|WS_CLIPCHILDREN|BorderFlag, m_x, m_y, WndRect.right-WndRect.left, WndRect.bottom-WndRect.top, 0x0, 0x0, m_HInstance, 0x0))){
  MessageBox(0x0, "Error: 'CreateWindowEx'", "ERROR", MB_OK|MB_ICONINFORMATION);
  UnregisterClass(ClassName, m_HInstance);
  return 0;
}
PIXELFORMATDESCRIPTOR pfd={sizeof(PIXELFORMATDESCRIPTOR), 1, PFD_DRAW_TO_WINDOW|PFD_SUPPORT_OPENGL|PFD_DOUBLEBUFFER, PFD_TYPE_RGBA, ColorBits, 0, 0, 0, 0, 0, 0, 0, 0, AccumBits, 0, 0, 0, 0, DepthBits, StencilBits, 0, 0, 0, 0, 0, 0};
if(!(m_HDc=GetDC(m_HWnd))){
  MessageBox(NULL, "Error: 'GetDC'", "ERROR", MB_OK|MB_ICONINFORMATION);
  DestroyWindow(m_HWnd);
  UnregisterClass(ClassName, m_HInstance);
  return 0;
}
if(!(PixelFormat=ChoosePixelFormat(m_HDc, &pfd))){
  MessageBox(NULL, "Error: 'ChoosePixelFormat'", "ERROR", MB_OK|MB_ICONINFORMATION);
  ReleaseDC(m_HWnd, m_HDc);
  DestroyWindow(m_HWnd);
  UnregisterClass(ClassName, m_HInstance);
  return 0;
}
if(!SetPixelFormat(m_HDc, PixelFormat, &pfd)){
  MessageBox(NULL, "Error: 'SetPixelFormat'", "ERROR", MB_OK|MB_ICONINFORMATION);
  ReleaseDC(m_HWnd, m_HDc);
  DestroyWindow(m_HWnd);
  UnregisterClass(ClassName, m_HInstance);
  return 0;
}
if(!(m_HGlrc=wglCreateContext(m_HDc))){
  MessageBox(NULL, "Error: 'wglCreateContext'", "ERROR", MB_OK|MB_ICONINFORMATION);
  ReleaseDC(m_HWnd, m_HDc);
  DestroyWindow(m_HWnd);
  UnregisterClass(ClassName, m_HInstance);
  return 0;
}
if(!(wglMakeCurrent(m_HDc, m_HGlrc))){
  MessageBox(NULL, "Error: 'wglMakeCurrent'", "ERROR", MB_OK|MB_ICONINFORMATION);
  wglDeleteContext(m_HGlrc);
  ReleaseDC(m_HWnd, m_HDc);
  DestroyWindow(m_HWnd);
  UnregisterClass(ClassName, m_HInstance);
  return 0;
}
SetForegroundWindow(m_HWnd);
SetFocus(m_HWnd);
return 1;
}

Edited by slicer4ever, 16 December 2012 - 07:39 AM.

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#39 Sik_the_hedgehog   Crossbones+   -  Reputation: 1805

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Posted 16 December 2012 - 08:16 AM

As stupid as it may sound (and I may have skipped something in this thread)... did you try setting the color buffer to 32-bit instead of 24-bit? Also a 24-bit depth buffer only makes sense with an 8-bit stencil buffer if I recall correctly (both are shared making up a 32-bit buffer together).
Don't pay much attention to "the hedgehog" in my nick, it's just because "Sik" was already taken =/ By the way, Sik is pronounced like seek, not like sick.

#40 mhagain   Crossbones+   -  Reputation: 8129

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Posted 16 December 2012 - 11:02 AM

Also a 24-bit depth buffer only makes sense with an 8-bit stencil buffer if I recall correctly (both are shared making up a 32-bit buffer together).


Context creation should automatically give you 32 bit with 24 bits for depth and the remaining 8 either unused or for stencil (it's important to check this after creation as if it gives you stencil - even if you don't explicitly request it - you will want to clear stencil at the same time as depth in order to get fast clears, but that's a separate matter). Rarely it will give you 16 bit or 32 bit depth but it can happen too.

It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.





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