1 /**************************************************************************
3 * Copyright 2007 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 **************************************************************************/
30 * Keith Whitwell <keith@tungstengraphics.com>
34 #include "pipe/p_util.h"
35 #include "pipe/p_shader_tokens.h"
37 #include "draw_private.h"
38 #include "draw_context.h"
41 #include "tgsi/util/tgsi_parse.h"
44 static INLINE
unsigned
45 compute_clipmask(const float *clip
, /*const*/ float plane
[][4], unsigned nr
)
50 /* Do the hardwired planes first:
52 if (-clip
[0] + clip
[3] < 0) mask
|= CLIP_RIGHT_BIT
;
53 if ( clip
[0] + clip
[3] < 0) mask
|= CLIP_LEFT_BIT
;
54 if (-clip
[1] + clip
[3] < 0) mask
|= CLIP_TOP_BIT
;
55 if ( clip
[1] + clip
[3] < 0) mask
|= CLIP_BOTTOM_BIT
;
56 if (-clip
[2] + clip
[3] < 0) mask
|= CLIP_FAR_BIT
;
57 if ( clip
[2] + clip
[3] < 0) mask
|= CLIP_NEAR_BIT
;
59 /* Followed by any remaining ones:
61 for (i
= 6; i
< nr
; i
++) {
62 if (dot4(clip
, plane
[i
]) < 0)
71 vs_exec_prepare( struct draw_vertex_shader
*shader
,
72 struct draw_context
*draw
)
74 /* specify the vertex program to interpret/execute */
75 tgsi_exec_machine_bind_shader(&draw
->machine
,
80 draw_update_vertex_fetch( draw
);
85 * Transform vertices with the current vertex program/shader
86 * Up to four vertices can be shaded at a time.
87 * \param vbuffer the input vertex data
88 * \param elts indexes of four input vertices
89 * \param count number of vertices to shade [1..4]
90 * \param vOut array of pointers to four output vertices
93 vs_exec_run( struct draw_vertex_shader
*shader
,
94 struct draw_context
*draw
,
97 struct vertex_header
*vOut
[] )
99 struct tgsi_exec_machine
*machine
= &draw
->machine
;
102 ALIGN16_DECL(struct tgsi_exec_vector
, inputs
, PIPE_MAX_ATTRIBS
);
103 ALIGN16_DECL(struct tgsi_exec_vector
, outputs
, PIPE_MAX_ATTRIBS
);
104 const float *scale
= draw
->viewport
.scale
;
105 const float *trans
= draw
->viewport
.translate
;
108 assert(draw
->vertex_shader
->info
.output_semantic_name
[0]
109 == TGSI_SEMANTIC_POSITION
);
111 machine
->Consts
= (float (*)[4]) draw
->user
.constants
;
112 machine
->Inputs
= ALIGN16_ASSIGN(inputs
);
113 if (draw
->rasterizer
->bypass_vs
) {
114 /* outputs are just the inputs */
115 machine
->Outputs
= machine
->Inputs
;
118 machine
->Outputs
= ALIGN16_ASSIGN(outputs
);
121 draw
->vertex_fetch
.fetch_func( draw
, machine
, elts
, count
);
123 if (!draw
->rasterizer
->bypass_vs
) {
124 /* run interpreter */
125 tgsi_exec_machine_run( machine
);
128 /* store machine results */
129 for (j
= 0; j
< count
; j
++) {
133 /* Handle attr[0] (position) specially:
135 * XXX: Computing the clipmask should be done in the vertex
136 * program as a set of DP4 instructions appended to the
137 * user-provided code.
139 x
= vOut
[j
]->clip
[0] = machine
->Outputs
[0].xyzw
[0].f
[j
];
140 y
= vOut
[j
]->clip
[1] = machine
->Outputs
[0].xyzw
[1].f
[j
];
141 z
= vOut
[j
]->clip
[2] = machine
->Outputs
[0].xyzw
[2].f
[j
];
142 w
= vOut
[j
]->clip
[3] = machine
->Outputs
[0].xyzw
[3].f
[j
];
144 if (!draw
->rasterizer
->bypass_clipping
) {
145 vOut
[j
]->clipmask
= compute_clipmask(vOut
[j
]->clip
, draw
->plane
, draw
->nr_planes
);
154 vOut
[j
]->clipmask
= 0;
156 vOut
[j
]->edgeflag
= 1;
158 if (!draw
->identity_viewport
) {
159 /* Viewport mapping */
160 vOut
[j
]->data
[0][0] = x
* scale
[0] + trans
[0];
161 vOut
[j
]->data
[0][1] = y
* scale
[1] + trans
[1];
162 vOut
[j
]->data
[0][2] = z
* scale
[2] + trans
[2];
163 vOut
[j
]->data
[0][3] = w
;
166 vOut
[j
]->data
[0][0] = x
;
167 vOut
[j
]->data
[0][1] = y
;
168 vOut
[j
]->data
[0][2] = z
;
169 vOut
[j
]->data
[0][3] = w
;
172 /* Remaining attributes are packed into sequential post-transform
173 * vertex attrib slots.
175 for (slot
= 1; slot
< draw
->num_vs_outputs
; slot
++) {
176 vOut
[j
]->data
[slot
][0] = machine
->Outputs
[slot
].xyzw
[0].f
[j
];
177 vOut
[j
]->data
[slot
][1] = machine
->Outputs
[slot
].xyzw
[1].f
[j
];
178 vOut
[j
]->data
[slot
][2] = machine
->Outputs
[slot
].xyzw
[2].f
[j
];
179 vOut
[j
]->data
[slot
][3] = machine
->Outputs
[slot
].xyzw
[3].f
[j
];
183 printf("Post xform vert:\n");
184 for (slot
= 0; slot
< draw
->num_vs_outputs
; slot
++) {
185 printf("%d: %f %f %f %f\n", slot
,
186 vOut
[j
]->data
[slot
][0],
187 vOut
[j
]->data
[slot
][1],
188 vOut
[j
]->data
[slot
][2],
189 vOut
[j
]->data
[slot
][3]);
194 } /* loop over vertices */
200 vs_exec_delete( struct draw_vertex_shader
*dvs
)
202 FREE((void*) dvs
->state
.tokens
);
207 struct draw_vertex_shader
*
208 draw_create_vs_exec(struct draw_context
*draw
,
209 const struct pipe_shader_state
*state
)
211 struct draw_vertex_shader
*vs
= CALLOC_STRUCT( draw_vertex_shader
);
212 uint nt
= tgsi_num_tokens(state
->tokens
);
217 /* we make a private copy of the tokens */
218 vs
->state
.tokens
= mem_dup(state
->tokens
, nt
* sizeof(state
->tokens
[0]));
219 vs
->prepare
= vs_exec_prepare
;
220 vs
->run
= vs_exec_run
;
221 vs
->delete = vs_exec_delete
;