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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5098 | clevermous | 1 | /* simple gl like driver for TinyGL and KolibriOS - porting iadn */ |
| 2 | #include |
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| 3 | #include "kosgl.h" |
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| 4 | #include "zgl.h" |
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| 5 | |||
| 6 | |||
| 7 | |||
| 8 | typedef struct { |
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| 9 | GLContext *gl_context; |
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| 10 | int xsize,ysize; |
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| 11 | int dx,dy; |
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| 12 | int x,y; |
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| 13 | } TinyGLContext; |
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| 14 | |||
| 15 | |||
| 16 | KOSGLContext kosglCreateContext(KOSGLContext shareList, int flags) |
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| 17 | { |
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| 18 | TinyGLContext *ctx; |
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| 19 | |||
| 20 | if (shareList != NULL) { |
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| 21 | gl_fatal_error("No sharing available in TinyGL"); |
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| 22 | } |
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| 23 | |||
| 24 | ctx=gl_malloc(sizeof(TinyGLContext)); |
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| 25 | if (!ctx) |
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| 26 | return NULL; |
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| 27 | ctx->gl_context=NULL; |
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| 28 | return (KOSGLContext) ctx; |
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| 29 | } |
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| 30 | |||
| 31 | void kosglDestroyContext( KOSGLContext ctx1 ) |
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| 32 | { |
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| 33 | TinyGLContext *ctx = (TinyGLContext *) ctx1; |
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| 34 | if (ctx->gl_context != NULL) { |
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| 35 | glClose(); |
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| 36 | } |
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| 37 | gl_free(ctx); |
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| 38 | } |
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| 39 | |||
| 40 | /* resize the glx viewport : we try to use the xsize and ysize |
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| 41 | given. We return the effective size which is guaranted to be smaller */ |
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| 42 | |||
| 43 | static int gl_resize_viewport(GLContext *c,int *xsize_ptr,int *ysize_ptr) |
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| 44 | { |
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| 45 | TinyGLContext *ctx; |
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| 46 | int xsize,ysize; |
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| 47 | |||
| 48 | ctx=(TinyGLContext *)c->opaque; |
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| 49 | |||
| 50 | xsize=*xsize_ptr; |
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| 51 | ysize=*ysize_ptr; |
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| 52 | |||
| 53 | /* we ensure that xsize and ysize are multiples of 2 for the zbuffer. |
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| 54 | TODO: find a better solution */ |
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| 55 | xsize&=~3; |
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| 56 | ysize&=~3; |
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| 57 | |||
| 58 | if (xsize == 0 || ysize == 0) return -1; |
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| 59 | |||
| 60 | *xsize_ptr=xsize-1; |
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| 61 | *ysize_ptr=ysize-1; |
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| 62 | ctx->dx = xsize; |
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| 63 | ctx->dy = ysize; |
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| 64 | |||
| 65 | ctx->xsize=xsize; |
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| 66 | ctx->ysize=ysize; |
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| 67 | |||
| 68 | /* resize the Z buffer */ |
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| 69 | ZB_resize(c->zb,NULL,xsize,ysize); |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |||
| 73 | /* we assume here that drawable is a window */ |
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| 74 | int kosglMakeCurrent( int win_x0, int win_y0,int win_x, int win_y, KOSGLContext ctx1) |
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| 75 | { |
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| 76 | TinyGLContext *ctx = (TinyGLContext *) ctx1; |
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| 77 | int mode; |
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| 78 | ZBuffer *zb; |
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| 79 | |||
| 80 | if (ctx->gl_context == NULL) { |
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| 81 | /* create the TinyGL context */ |
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| 82 | ctx->x = win_x0; |
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| 83 | ctx->y = win_y0; |
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| 84 | ctx->dx = win_x; |
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| 85 | ctx->dy = win_y; |
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| 86 | |||
| 87 | /* currently, we only support 16 bit rendering */ |
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| 88 | mode = ZB_MODE_RGB24; |
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| 89 | zb=ZB_open(win_x,win_y,mode,0,NULL,NULL,NULL); |
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| 90 | |||
| 91 | if (zb == NULL) { |
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| 92 | fprintf(stderr, "Error while initializing Z buffer\n"); |
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| 93 | exit(1); |
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| 94 | } |
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| 95 | |||
| 96 | /* initialisation of the TinyGL interpreter */ |
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| 97 | glInit(zb); |
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| 98 | |||
| 99 | ctx->gl_context=gl_get_context(); |
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| 100 | |||
| 101 | ctx->gl_context->opaque=(void *) ctx; |
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| 102 | ctx->gl_context->gl_resize_viewport=gl_resize_viewport; |
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| 103 | |||
| 104 | /* set the viewport : we force a call to gl_resize_viewport */ |
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| 105 | ctx->gl_context->viewport.xsize=-1; |
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| 106 | ctx->gl_context->viewport.ysize=-1; |
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| 107 | |||
| 108 | glViewport(0, 0, win_x, win_y); |
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| 109 | |||
| 110 | } |
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| 111 | return 1; |
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| 112 | } |
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| 113 | |||
| 114 | void kosglSwapBuffers( ) |
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| 115 | { |
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| 116 | GLContext *gl_context; |
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| 117 | TinyGLContext *ctx; |
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| 118 | |||
| 119 | /* retrieve the current TinyGLContext */ |
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| 120 | gl_context=gl_get_context(); |
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| 121 | ctx=(TinyGLContext *)gl_context->opaque; |
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| 122 | |||
| 123 | __asm__ __volatile__("int $0x40"::"a"(7), |
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| 124 | "b"((char *)gl_context->zb->pbuf), |
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| 125 | "c"((ctx->dx<<16)|ctx->dy), |
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| 126 | "d"((ctx->x<<16)|ctx->y)); |
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| 127 | } |