st_context.h revision 086734502a614e7778533018846ee66a66df9821 
1/**************************************************************************
2 *
3 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#ifndef ST_CONTEXT_H
29#define ST_CONTEXT_H
30
31#include "mtypes.h"
32#include "pipe/p_state.h"
33
34
35struct st_context;
36struct st_region;
37struct st_texture_object;
38struct st_texture_image;
39struct st_fragment_program;
40struct draw_context;
41struct draw_stage;
42struct cso_cache;
43struct cso_blend;
44
45#define ST_NEW_MESA                    0x1 /* Mesa state has changed */
46#define ST_NEW_FRAGMENT_PROGRAM        0x2
47#define ST_NEW_VERTEX_PROGRAM          0x4
48
49struct st_state_flags {
50   GLuint mesa;
51   GLuint st;
52};
53
54struct st_tracked_state {
55   const char *name;
56   struct st_state_flags dirty;
57   void (*update)( struct st_context *st );
58};
59
60
61
62
63struct st_context
64{
65   GLcontext *ctx;
66
67   struct pipe_context *pipe;
68
69   struct draw_context *draw;  /**< For selection/feedback */
70   struct draw_stage *feedback_stage;  /**< For FL_FEEDBACK rendermode */
71   struct draw_stage *selection_stage;  /**< For GL_SELECT rendermode */
72
73   /* Eventually will use a cache to feed the pipe with
74    * create/bind/delete calls to constant state objects.  Not yet
75    * though, we just shove random objects across the interface.
76    */
77   struct {
78      const struct cso_blend *blend;
79      const struct cso_sampler *sampler[PIPE_MAX_SAMPLERS];
80      const struct cso_depth_stencil *depth_stencil;
81      const struct cso_rasterizer  *rasterizer;
82      const struct cso_fragment_shader *fs;
83      const struct cso_vertex_shader   *vs;
84
85      struct pipe_alpha_test_state  alpha_test;
86      struct pipe_blend_color  blend_color;
87      struct pipe_clear_color_state clear_color;
88      struct pipe_clip_state clip;
89      struct pipe_constant_buffer constants[2];
90      struct pipe_feedback_state feedback;
91      struct pipe_framebuffer_state framebuffer;
92      struct pipe_mipmap_tree *texture[PIPE_MAX_SAMPLERS];
93      struct pipe_poly_stipple poly_stipple;
94      struct pipe_scissor_state scissor;
95      struct pipe_viewport_state viewport;
96   } state;
97
98   struct {
99      struct st_tracked_state tracked_state[2];
100   } constants;
101
102   struct {
103      struct gl_fragment_program *fragment_program;
104   } cb;
105
106   struct {
107      GLuint frontbuffer_dirty:1;
108   } flags;
109
110   char vendor[100];
111   char renderer[100];
112
113   /* State to be validated:
114    */
115   struct st_tracked_state **atoms;
116   GLuint nr_atoms;
117
118   struct st_state_flags dirty;
119
120   GLfloat polygon_offset_scale; /* ?? */
121
122   /** Mapping from VERT_ATTRIB_x to post-transformed vertex slot */
123   GLuint vertex_attrib_to_slot[VERT_RESULT_MAX];
124
125   struct st_vertex_program *vp;    /**< Currently bound vertex program */
126   struct st_fragment_program *fp;  /**< Currently bound fragment program */
127
128   /**
129    * Buffer object which stores the ctx->Current.Attrib[] values.
130    * Used for vertex array drawing when we we need an attribute for
131    * which there's no enabled array.
132    */
133   struct pipe_buffer_handle *default_attrib_buffer;
134
135   struct cso_cache *cache;
136};
137
138
139/* Need this so that we can implement Mesa callbacks in this module.
140 */
141static INLINE struct st_context *st_context(GLcontext *ctx)
142{
143   return ctx->st;
144}
145
146
147extern void st_init_driver_functions(struct dd_function_table *functions);
148
149
150
151#define Y_0_TOP 1
152#define Y_0_BOTTOM 2
153
154static INLINE GLuint
155st_fb_orientation(const struct gl_framebuffer *fb)
156{
157   if (fb && fb->Name == 0) {
158      /* Drawing into a window (on-screen buffer).
159       *
160       * Negate Y scale to flip image vertically.
161       * The NDC Y coords prior to viewport transformation are in the range
162       * [y=-1=bottom, y=1=top]
163       * Hardware window coords are in the range [y=0=top, y=H-1=bottom] where
164       * H is the window height.
165       * Use the viewport transformation to invert Y.
166       */
167      return Y_0_TOP;
168   }
169   else {
170      /* Drawing into user-created FBO (very likely a texture).
171       *
172       * For textures, T=0=Bottom, so by extension Y=0=Bottom for rendering.
173       */
174      return Y_0_BOTTOM;
175   }
176}
177
178
179#endif
180