1 /**************************************************************************
3 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
28 #include "main/glheader.h"
29 #include "main/macros.h"
30 #include "main/enums.h"
33 #include "pipe/draw/draw_context.h"
34 #include "sp_context.h"
38 #define EMIT_ATTR( VF_ATTR, FRAG_ATTR, INTERP ) \
40 slot_to_vf_attr[softpipe->nr_attrs] = VF_ATTR; \
41 softpipe->vf_attr_to_slot[VF_ATTR] = softpipe->nr_attrs; \
42 softpipe->fp_attr_to_slot[FRAG_ATTR] = softpipe->nr_attrs; \
43 softpipe->interp[softpipe->nr_attrs] = INTERP; \
44 softpipe->nr_attrs++; \
45 attr_mask |= (1 << (VF_ATTR)); \
49 static const GLuint frag_to_vf
[FRAG_ATTRIB_MAX
] =
75 * Determine which post-transform / pre-rasterization vertex attributes
77 * Derived from: fs, setup states.
79 static void calculate_vertex_layout( struct softpipe_context
*softpipe
)
81 const GLbitfield inputsRead
= softpipe
->fs
.inputs_read
;
82 GLuint slot_to_vf_attr
[VF_ATTRIB_MAX
];
83 GLbitfield attr_mask
= 0x0;
86 /* Need Z if depth test is enabled or the fragment program uses the
87 * fragment position (XYZW).
89 if (softpipe
->depth_test
.enabled
||
90 (inputsRead
& FRAG_ATTRIB_WPOS
))
91 softpipe
->need_z
= GL_TRUE
;
93 softpipe
->need_z
= GL_FALSE
;
95 /* Need W if we do any perspective-corrected interpolation or the
96 * fragment program uses the fragment position.
98 if (inputsRead
& FRAG_ATTRIB_WPOS
)
99 softpipe
->need_w
= GL_TRUE
;
101 softpipe
->need_w
= GL_FALSE
;
104 softpipe
->nr_attrs
= 0;
105 memset(slot_to_vf_attr
, 0, sizeof(slot_to_vf_attr
));
107 memset(softpipe
->fp_attr_to_slot
, 0, sizeof(softpipe
->fp_attr_to_slot
));
108 memset(softpipe
->vf_attr_to_slot
, 0, sizeof(softpipe
->vf_attr_to_slot
));
110 /* TODO - Figure out if we need to do perspective divide, etc.
112 EMIT_ATTR(VF_ATTRIB_POS
, FRAG_ATTRIB_WPOS
, INTERP_LINEAR
);
114 /* Pull in the rest of the attributes. They are all in float4
115 * format. Future optimizations could be to keep some attributes
116 * as fixed point or ubyte format.
118 for (i
= 1; i
< FRAG_ATTRIB_TEX0
; i
++) {
119 if (inputsRead
& (1 << i
)) {
120 assert(i
< sizeof(frag_to_vf
) / sizeof(frag_to_vf
[0]));
121 if (softpipe
->setup
.flatshade
122 && (i
== FRAG_ATTRIB_COL0
|| i
== FRAG_ATTRIB_COL1
))
123 EMIT_ATTR(frag_to_vf
[i
], i
, INTERP_CONSTANT
);
125 EMIT_ATTR(frag_to_vf
[i
], i
, INTERP_LINEAR
);
129 for (i
= FRAG_ATTRIB_TEX0
; i
< FRAG_ATTRIB_MAX
; i
++) {
130 if (inputsRead
& (1 << i
)) {
131 assert(i
< sizeof(frag_to_vf
) / sizeof(frag_to_vf
[0]));
132 EMIT_ATTR(frag_to_vf
[i
], i
, INTERP_PERSPECTIVE
);
133 softpipe
->need_w
= GL_TRUE
;
137 softpipe
->nr_frag_attrs
= softpipe
->nr_attrs
;
139 /* Additional attributes required for setup: Just twosided
140 * lighting. Edgeflag is dealt with specially by setting bits in
143 if (softpipe
->setup
.light_twoside
) {
144 if (inputsRead
& FRAG_BIT_COL0
) {
145 EMIT_ATTR(VF_ATTRIB_BFC0
, FRAG_ATTRIB_MAX
, 0); /* XXX: mark as discarded after setup */
148 if (inputsRead
& FRAG_BIT_COL1
) {
149 EMIT_ATTR(VF_ATTRIB_BFC1
, FRAG_ATTRIB_MAX
, 0); /* XXX: discard after setup */
153 /* If the attributes have changed, tell the draw module (which in turn
154 * tells the vf module) about the new vertex layout.
156 if (attr_mask
!= softpipe
->attr_mask
) {
157 softpipe
->attr_mask
= attr_mask
;
159 draw_set_vertex_attributes( softpipe
->draw
,
161 softpipe
->nr_attrs
);
167 * Recompute cliprect from scissor bounds, scissor enable and surface size.
170 compute_cliprect(struct softpipe_context
*sp
)
172 GLint surfWidth
, surfHeight
;
174 if (sp
->framebuffer
.num_cbufs
> 0) {
175 surfWidth
= sp
->framebuffer
.cbufs
[0]->width
;
176 surfHeight
= sp
->framebuffer
.cbufs
[0]->height
;
180 surfWidth
= sp
->scissor
.maxx
;
181 surfHeight
= sp
->scissor
.maxy
;
184 if (sp
->setup
.scissor
) {
185 /* clip to scissor rect */
186 sp
->cliprect
.minx
= MAX2(sp
->scissor
.minx
, 0);
187 sp
->cliprect
.miny
= MAX2(sp
->scissor
.miny
, 0);
188 sp
->cliprect
.maxx
= MIN2(sp
->scissor
.maxx
, surfWidth
);
189 sp
->cliprect
.maxy
= MIN2(sp
->scissor
.maxy
, surfHeight
);
192 /* clip to surface bounds */
193 sp
->cliprect
.minx
= 0;
194 sp
->cliprect
.miny
= 0;
195 sp
->cliprect
.maxx
= surfWidth
;
196 sp
->cliprect
.maxy
= surfHeight
;
201 /* Hopefully this will remain quite simple, otherwise need to pull in
202 * something like the state tracker mechanism.
204 void softpipe_update_derived( struct softpipe_context
*softpipe
)
206 if (softpipe
->dirty
& (SP_NEW_SETUP
| SP_NEW_FS
))
207 calculate_vertex_layout( softpipe
);
209 if (softpipe
->dirty
& (SP_NEW_SCISSOR
|
212 compute_cliprect(softpipe
);
214 if (softpipe
->dirty
& (SP_NEW_BLEND
|
221 sp_build_quad_pipeline(softpipe
);