source: trunk/sys/TinyGL/src/nglx.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

First import

File size: 3.0 KB
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1/* simple glx like driver for TinyGL and Nano X */
2#include <GL/gl.h>
3#include <GL/nglx.h>
4#include <microwin/nano-X.h>
5#include "zgl.h"
6
7typedef struct {
8    GLContext *gl_context;
9    int xsize,ysize;
10    GR_DRAW_ID drawable;
11    GR_GC_ID gc;
12    int pixtype; /* pixel type in TinyGL */
13} TinyNGLXContext;
14
15NGLXContext nglXCreateContext(NGLXContext shareList, int flags)
16{
17  TinyNGLXContext *ctx;
18
19  if (shareList != NULL) {
20    gl_fatal_error("No sharing available in TinyGL");
21  }
22  ctx=gl_malloc(sizeof(TinyNGLXContext));
23  if (!ctx)
24      return NULL;
25  ctx->gl_context=NULL;
26  return (NGLXContext) ctx;
27}
28
29void glXDestroyContext( NGLXContext ctx1 )
30{
31  TinyNGLXContext *ctx = (TinyNGLXContext *) ctx1;
32  if (ctx->gl_context != NULL) {
33    glClose();
34  }
35  gl_free(ctx);
36}
37
38
39/* resize the glx viewport : we try to use the xsize and ysize
40   given. We return the effective size which is guaranted to be smaller */
41
42static int glX_resize_viewport(GLContext *c,int *xsize_ptr,int *ysize_ptr)
43{
44  TinyNGLXContext *ctx;
45  int xsize,ysize;
46 
47  ctx=(TinyNGLXContext *)c->opaque;
48
49  xsize=*xsize_ptr;
50  ysize=*ysize_ptr;
51
52  /* we ensure that xsize and ysize are multiples of 2 for the zbuffer.
53     TODO: find a better solution */
54  xsize&=~3;
55  ysize&=~3;
56
57  if (xsize == 0 || ysize == 0) return -1;
58
59  *xsize_ptr=xsize;
60  *ysize_ptr=ysize;
61
62  ctx->xsize=xsize;
63  ctx->ysize=ysize;
64
65  /* resize the Z buffer */
66  ZB_resize(c->zb,NULL,xsize,ysize);
67  return 0;
68}
69
70/* we assume here that drawable is a window */
71int nglXMakeCurrent( NGLXDrawable drawable,
72                     NGLXContext ctx1)
73{
74  TinyNGLXContext *ctx = (TinyNGLXContext *) ctx1;
75  int mode, xsize, ysize;
76  ZBuffer *zb;
77  GR_WINDOW_INFO win_info;
78
79  if (ctx->gl_context == NULL) {
80      /* create the TinyGL context */
81      GrGetWindowInfo(drawable, &win_info);
82
83      xsize = win_info.width;
84      ysize = win_info.height;
85
86      /* currently, we only support 16 bit rendering */
87      mode = ZB_MODE_5R6G5B;
88      zb=ZB_open(xsize,ysize,mode,0,NULL,NULL,NULL);
89      if (zb == NULL) {
90          fprintf(stderr, "Error while initializing Z buffer\n");
91          exit(1);
92      }
93
94      ctx->pixtype = MWPF_TRUECOLOR565;
95
96      /* create a gc */
97      ctx->gc = GrNewGC();
98     
99      /* initialisation of the TinyGL interpreter */
100      glInit(zb);
101      ctx->gl_context=gl_get_context();
102      ctx->gl_context->opaque=(void *) ctx;
103      ctx->gl_context->gl_resize_viewport=glX_resize_viewport;
104
105      /* set the viewport : we force a call to glX_resize_viewport */
106      ctx->gl_context->viewport.xsize=-1;
107      ctx->gl_context->viewport.ysize=-1;
108     
109      glViewport(0, 0, xsize, ysize);
110  }
111 
112  return 1;
113}
114
115void nglXSwapBuffers( NGLXDrawable drawable )
116{
117    GLContext *gl_context;
118    TinyNGLXContext *ctx;
119   
120    /* retrieve the current NGLXContext */
121    gl_context=gl_get_context();
122    ctx=(TinyNGLXContext *)gl_context->opaque;
123   
124    GrArea(drawable, ctx->gc, 0, 0, ctx->xsize, 
125           ctx->ysize, ctx->gl_context->zb->pbuf, ctx->pixtype);
126}
127
128
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