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view test/testgamma.c @ 1192:54aa9aa32327
To: sdl@libsdl.org
From: Christian Walther <cwalther@gmx.ch>
Date: Fri, 18 Nov 2005 23:39:02 +0100
Subject: [SDL] Mouse position bugs on Mac OS X
The attached patch fixes a few bugs in SDL related to the mouse position
in windowed mode on Mac OS X, reproduced using the attached minimal test
program - at least here on 10.3.9, with SDL CVS from today. Could anyone
test whether the bugs exist and are fixed by the patch on 10.2 and 10.4?
1. When using OpenGL, the vertical mouse positions obtained through
events or SDL_GetMouseState() are off by one.
2. When using OpenGL, SDL_WarpMouse() inverts the y coordinate.
3. Clicks on the topmost pixel row of the window are not recognized.
1 and 2 do not occur in non-OpenGL mode, while 3 does. All three only
occur in windowed mode, not in fullscreen.
The cause for 1 and 3 is that in Cocoa, "the location of the mouse"
seems to be defined as "the location of the top left corner of the mouse
pointer's hot pixel" (this is not documented, it's just what I found out
here), which together with the fact that Cocoa's usual y coordinates
start at the bottom and increase upwards means that the y coordinate of
the mouse runs from 1 to h, not from 0 to h-1, in a window of height h.
If it does work on 10.2 and 10.4 (I'll try to test it as soon as I can,
but at the moment all I have at hand is 10.3.9), can this be applied to
the CVS?
-Christian
To: sdl@libsdl.org
From: Christian Walther <cwalther@gmx.ch>
Date: Mon, 28 Nov 2005 10:41:51 +0100
Subject: [SDL] Re: Mouse position bugs on Mac OS X
I wrote:
> I'll try to test it as soon as I can, but at the moment all I have at hand is 10.3.9
So, here are the results of my tests (with patched and unpatched
frameworks compiled with Xcode 1.5 (gcc 3.3) on 10.3.9):
On 10.1.5, my test program doesn't run because of "Undefined symbols:
SDL undefined reference to _CGMainDisplayID expected to be defined in
Carbon". I guess not supporting 10.1 was a deliberate decision then and
that's OK with me.
On 10.2.8, 10.3.9, and 10.4.0, the bugs exist as described in my
original post and are fixed by my patch. That is, there is no difference
between pre/post 10.3 and the patched version works correctly in all
combinations of GL/non-GL and windowed/fullscreen.
I therefore recommend the patch for inclusion.
-Christian
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Mon, 28 Nov 2005 13:58:26 +0000 |
parents | be9c9c8f6d53 |
children | 782fd950bd46 c121d94672cb |
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/* Bring up a window and manipulate the gamma on it */ #include <stdlib.h> #include <stdio.h> #include <string.h> #include <math.h> #include "SDL.h" /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ static void quit(int rc) { SDL_Quit(); exit(rc); } /* Turn a normal gamma value into an appropriate gamma ramp */ void CalculateGamma(double gamma, Uint16 *ramp) { int i, value; gamma = 1.0 / gamma; for ( i=0; i<256; ++i ) { value = (int)(pow((double)i/256.0, gamma)*65535.0 + 0.5); if ( value > 65535 ) { value = 65535; } ramp[i] = (Uint16)value; } } /* This can be used as a general routine for all of the test programs */ int get_video_args(char *argv[], int *w, int *h, int *bpp, Uint32 *flags) { int i; *w = 640; *h = 480; *bpp = 0; *flags = SDL_SWSURFACE; for ( i=1; argv[i]; ++i ) { if ( strcmp(argv[i], "-width") == 0 ) { if ( argv[i+1] ) { *w = atoi(argv[++i]); } } else if ( strcmp(argv[i], "-height") == 0 ) { if ( argv[i+1] ) { *h = atoi(argv[++i]); } } else if ( strcmp(argv[i], "-bpp") == 0 ) { if ( argv[i+1] ) { *bpp = atoi(argv[++i]); } } else if ( strcmp(argv[i], "-fullscreen") == 0 ) { *flags |= SDL_FULLSCREEN; } else if ( strcmp(argv[i], "-hw") == 0 ) { *flags |= SDL_HWSURFACE; } else if ( strcmp(argv[i], "-hwpalette") == 0 ) { *flags |= SDL_HWPALETTE; } else break; } return i; } int main(int argc, char *argv[]) { SDL_Surface *screen; SDL_Surface *image; float gamma; int i; int w, h, bpp; Uint32 flags; Uint16 ramp[256]; Uint16 red_ramp[256]; Uint32 then, timeout; /* Check command line arguments */ argv += get_video_args(argv, &w, &h, &bpp, &flags); /* Initialize SDL */ if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) { fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError()); return(1); } /* Initialize the display, always use hardware palette */ screen = SDL_SetVideoMode(w, h, bpp, flags | SDL_HWPALETTE); if ( screen == NULL ) { fprintf(stderr, "Couldn't set %dx%d video mode: %s\n", w, h, SDL_GetError()); quit(1); } /* Set the window manager title bar */ SDL_WM_SetCaption("SDL gamma test", "testgamma"); /* Set the desired gamma, if any */ gamma = 1.0f; if ( *argv ) { gamma = (float)atof(*argv); } if ( SDL_SetGamma(gamma, gamma, gamma) < 0 ) { fprintf(stderr, "Unable to set gamma: %s\n", SDL_GetError()); quit(1); } #if 0 /* This isn't supported. Integrating the gamma ramps isn't exact */ /* See what gamma was actually set */ float real[3]; if ( SDL_GetGamma(&real[0], &real[1], &real[2]) < 0 ) { printf("Couldn't get gamma: %s\n", SDL_GetError()); } else { printf("Set gamma values: R=%2.2f, G=%2.2f, B=%2.2f\n", real[0], real[1], real[2]); } #endif /* Do all the drawing work */ image = SDL_LoadBMP("sample.bmp"); if ( image ) { SDL_Rect dst; dst.x = (screen->w - image->w)/2; dst.y = (screen->h - image->h)/2; dst.w = image->w; dst.h = image->h; SDL_BlitSurface(image, NULL, screen, &dst); SDL_UpdateRects(screen, 1, &dst); } /* Wait a bit, handling events */ then = SDL_GetTicks(); timeout = (5*1000); while ( (SDL_GetTicks()-then) < timeout ) { SDL_Event event; while ( SDL_PollEvent(&event) ) { switch (event.type) { case SDL_QUIT: /* Quit now */ timeout = 0; break; case SDL_KEYDOWN: switch (event.key.keysym.sym) { case SDLK_SPACE: /* Go longer.. */ timeout += (5*1000); break; case SDLK_UP: gamma += 0.2f; SDL_SetGamma(gamma, gamma, gamma); break; case SDLK_DOWN: gamma -= 0.2f; SDL_SetGamma(gamma, gamma, gamma); break; case SDLK_ESCAPE: timeout = 0; break; default: break; } break; } } } /* Perform a gamma flash to red using color ramps */ while ( gamma < 10.0 ) { /* Increase the red gamma and decrease everything else... */ gamma += 0.1f; CalculateGamma(gamma, red_ramp); CalculateGamma(1.0/gamma, ramp); SDL_SetGammaRamp(red_ramp, ramp, ramp); } /* Finish completely red */ memset(red_ramp, 255, sizeof(red_ramp)); memset(ramp, 0, sizeof(ramp)); SDL_SetGammaRamp(red_ramp, ramp, ramp); /* Now fade out to black */ for ( i=(red_ramp[0] >> 8); i >= 0; --i ) { memset(red_ramp, i, sizeof(red_ramp)); SDL_SetGammaRamp(red_ramp, NULL, NULL); } SDL_Delay(1*1000); SDL_Quit(); return(0); }