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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_NONE = 0,
  34         C3_CONTEXT_VIEW_EYE,
  35         C3_CONTEXT_VIEW_LIGHT
  36 };
  37
  38 typedef struct c3context_view_t {
  39         int                     type : 4,                       // C3_CONTEXT_VIEW_EYE...
  40                                 dirty : 1,
  41                                 index : 4;                      // index in context array
  42         c3apiobject_t   bid;                    // buffer id (fbo, texture...)
  43         c3vec2          size;                           // in pixels. for fbo/textures/window
  44         c3cam_t         cam;
  45         c3mat4          projection;                     // projection matrix
  46
  47         c3geometry_array_t      projected;
  48         struct {
  49                 c3f min, max;
  50         } z;
  51 } c3context_view_t, *c3context_view_p;
  52
  53 DECLARE_C_ARRAY(c3context_view_t, c3context_view_array, 4);
  54
  55 //! c3context_t is a container for a 'scene' to be drawn
  56 /*!
  57  * A c3context_t holds a root object, a list of already cached projected
  58  * version of the geometry, and a driver that can be customized to draw it.
  59  *
  60  * This is a wrapper around a "top level object", the list of projected
  61  * geometries is kept, purged and resorted if the root object becomes
  62  * dirty
  63  */
  64 typedef struct c3context_t {
  65         int     current;
  66         c3context_view_array_t  views;
  67
  68         struct c3object_t * root;       // root object
  69
  70         c3pixels_array_t        pixels; // pixels, textures...
  71         c3program_array_t       programs;       // fragment, vertex, geometry shaders
  72
  73         const struct c3driver_context_t ** driver;
  74 } c3context_t, *c3context_p;
  75
  76 //! Allocates a new context of size w=width, h=height
  77 c3context_p
  78 c3context_new(
  79                 int w,
  80                 int h);
  81
  82 //! Initializes a new context 'c' of size w=width, h=height
  83 c3context_p
  84 c3context_init(
  85                 c3context_p c,
  86                 int w,
  87                 int h);
  88
  89 //! Disposes the context, and everything underneath
  90 void
  91 c3context_dispose(
  92                 c3context_p c);
  93
  94 //! Reproject geometry for dirty objects
  95 int
  96 c3context_project(
  97                 c3context_p c);
  98 //! Draws the context
  99 void
 100 c3context_draw(
 101                 c3context_p c);
 102
 103 IMPLEMENT_C_ARRAY(c3context_view_array);
 104
 105 /*
 106  * Set and get the current view, this is done
 107  * before projecting and drawing
 108  */
 109 static inline c3context_view_p
 110 c3context_view_get(
 111                 c3context_p c )
 112 {
 113         return &c->views.e[c->current];
 114 }
 115
 116 static inline c3context_view_p
 117 c3context_view_get_at(
 118                 c3context_p c,
 119                 int view)
 120 {
 121         if (view < c->views.count)
 122                 return &c->views.e[view];
 123         return NULL;
 124 }
 125
 126 static inline void
 127 c3context_view_set(
 128                 c3context_p c,
 129                 int view)
 130 {
 131         if (view < c->views.count)
 132                 c->current = view;
 133 }
 134
 135 #endif /* __C3CONTEXT_H___ */