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/* sdltools.c
*
* SDL Tools
*
*
*/
#include <SDL/SDL.h>
#include <SDL/SDL_image.h>
#include <GL/glew.h>
#include "sdltools.h"
#include "math3d.h"
#include "glframe.h"
/* creates a new mouse cursor from an XPM */
const char *arrow[] = {
/* width height num_colors chars_per_pixel */
" 32 32 3 1",
/* colors */
"X c #000000",
". c #ffffff",
" c None",
/* pixels */
"X ",
"XX ",
"X.X ",
"X..X ",
"X...X ",
"X....X ",
"X.....X ",
"X......X ",
"X.......X ",
"X........X ",
"X.....XXXXX ",
"X..X..X ",
"X.X X..X ",
"XX X..X ",
"X X..X ",
" X..X ",
" X..X ",
" X..X ",
" XX ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
" ",
"0,0"
};
inline void sdlFrameControl(const unsigned int startclock)
{
unsigned int deltaclock = SDL_GetTicks() - startclock;
if (deltaclock < 1000 / FRAMES_PER_SECOND)
SDL_Delay((1000 / FRAMES_PER_SECOND) - deltaclock);
#ifdef STAT_FPS
char buffer[30] = { 0 };
sprintf(buffer, "%s: %4d fps", window_caption,
1000 / (SDL_GetTicks() - startclock));
SDL_WM_SetCaption(buffer, NULL);
#endif
}
SDL_Cursor *sdlInitCursor(const char *image[])
{
int i, row, col;
Uint8 data[4*32];
Uint8 mask[4*32];
int hot_x, hot_y;
i = -1;
for (row = 0; row < 32; ++row)
{
for (col = 0; col < 32; ++col)
{
if (col % 8)
{
data[i] <<= 1;
mask[i] <<= 1;
}
else
{
++i;
data[i] = mask[i] = 0;
}
switch (image[4+row][col])
{
case 'X':
data[i] |= 0x01;
break;
case '.':
mask[i] |= 0x01;
break;
case ' ':
break;
}
}
}
sscanf(image[4+row], "%d,%d", &hot_x, &hot_y);
return SDL_CreateCursor(data, mask, 32, 32, hot_x, hot_y);
}
unsigned int sdlTimerCallback(unsigned int interval, void *params)
{
GLFrame *p = (GLFrame *) params;
gl_frame_normalize(p);
return interval;
}
/* load an OpenGL texture from SDL surface */
GLuint sdltLoadGLTexture(SDL_Surface *surface, GLfloat *texcoord)
{
GLuint texture;
int w, h;
SDL_Surface *image;
SDL_Rect area;
#if 0
Uint32 saved_flags;
Uint8 saved_alpha;
#endif
/* use the surface width and height expanded to powers of 2 */
w = m3dPowerOfTwo(surface->w);
h = m3dPowerOfTwo(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 */
/* the mask in following line are not big endian aware */
image = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 32, 0x000000FF, 0x0000FF00, /* XXX */
0x00FF0000, 0xFF000000 /* OpenGL RGBA masks */ );
if (!image)
return 0;
#if 0
/* save the alpha blending attributes */
saved_flags = surface->flags & (SDL_SRCALPHA | SDL_RLEACCELOK);
SDL_GetSurfaceAlphaMod(surface, &saved_alpha);
if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
SDL_SetAlpha(surface, 0, 0);
#endif
/* 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);
#if 0
/* restore the alpha blending attributes */
if ((saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA)
SDL_SetAlpha(surface, saved_flags, saved_alpha);
#endif
/* 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); /* XXX */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); /* XXX */
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE,
image->pixels);
SDL_FreeSurface(image);
return texture;
}
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