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   1 /*
   2         c3context.h
   3
   4         Copyright 2008-2012 Michel Pollet <buserror@gmail.com>
   5
   6         This file is part of libc3.
   7
   8         libc3 is free software: you can redistribute it and/or modify
   9         it under the terms of the GNU General Public License as published by
  10         the Free Software Foundation, either version 3 of the License, or
  11         (at your option) any later version.
  12
  13         libc3 is distributed in the hope that it will be useful,
  14         but WITHOUT ANY WARRANTY; without even the implied warranty of
  15         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16         GNU General Public License for more details.
  17
  18         You should have received a copy of the GNU General Public License
  19         along with libc3.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 #ifndef __C3CONTEXT_H___
  24 #define __C3CONTEXT_H___
  25
  26 #include "c3algebra.h"
  27 #include "c3geometry.h"
  28 #include "c3pixels.h"
  29 #include "c3program.h"
  30 #include "c3camera.h"
  31
  32 enum {
  33         C3_CONTEXT_VIEW_EYE = 0,
  34         C3_CONTEXT_VIEW_LIGHT
  35 };
  36
  37 typedef struct c3context_view_t {
  38         int                     type : 4,       // C3_CONTEXT_VIEW_EYE...
  39                                 dirty : 1;
  40         c3vec2          size;                                   // in pixels. for fbo/textures/window
  41         c3cam_t         cam;
  42         c3mat4          projection;                             // projection matrix
  43
  44         c3geometry_array_t      projected;
  45         struct {
  46                 c3f min, max;
  47         } z;
  48 } c3context_view_t, *c3context_view_p;
  49
  50 DECLARE_C_ARRAY(c3context_view_t, c3context_view_array, 4);
  51
  52 //! c3context_t is a container for a 'scene' to be drawn
  53 /*!
  54  * A c3context_t holds a root object, a list of already cached projected
  55  * version of the geometry, and a driver that can be customized to draw it.
  56  *
  57  * This is a wrapper around a "top level object", the list of projected
  58  * geometries is kept, purged and resorted if the root object becomes
  59  * dirty
  60  */
  61 typedef struct c3context_t {
  62         int     current;
  63         c3context_view_array_t  views;
  64
  65         struct c3object_t * root;       // root object
  66
  67         c3pixels_array_t        pixels; // pixels, textures...
  68         c3program_array_t       programs;       // fragment, vertex, geometry shaders
  69
  70         const struct c3driver_context_t ** driver;
  71 } c3context_t, *c3context_p;
  72
  73 //! Allocates a new context of size w=width, h=height
  74 c3context_p
  75 c3context_new(
  76                 int w,
  77                 int h);
  78
  79 //! Initializes a new context 'c' of size w=width, h=height
  80 c3context_p
  81 c3context_init(
  82                 c3context_p c,
  83                 int w,
  84                 int h);
  85
  86 //! Disposes the context, and everything underneath
  87 void
  88 c3context_dispose(
  89                 c3context_p c);
  90
  91 //! Reproject geometry for dirty objects
  92 void
  93 c3context_project(
  94                 c3context_p c);
  95 //! Draws the context
  96 void
  97 c3context_draw(
  98                 c3context_p c);
  99
 100 IMPLEMENT_C_ARRAY(c3context_view_array);
 101
 102 /*
 103  * Set and get the current view, this is done
 104  * before projecting and drawing
 105  */
 106 static inline c3context_view_p
 107 c3context_view_get(
 108                 c3context_p c )
 109 {
 110         return &c->views.e[c->current];
 111 }
 112
 113 static inline c3context_view_p
 114 c3context_view_get_at(
 115                 c3context_p c,
 116                 int view)
 117 {
 118         if (view < c->views.count)
 119                 return &c->views.e[view];
 120         return NULL;
 121 }
 122
 123 static inline void
 124 c3context_view_set(
 125                 c3context_p c,
 126                 int view)
 127 {
 128         if (view < c->views.count)
 129                 c->current = view;
 130 }
 131
 132 #endif /* __C3CONTEXT_H___ */