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"
42 static INLINE
unsigned
43 compute_clipmask(const float *clip
, /*const*/ float plane
[][4], unsigned nr
)
48 /* Do the hardwired planes first:
50 if (-clip
[0] + clip
[3] < 0) mask
|= CLIP_RIGHT_BIT
;
51 if ( clip
[0] + clip
[3] < 0) mask
|= CLIP_LEFT_BIT
;
52 if (-clip
[1] + clip
[3] < 0) mask
|= CLIP_TOP_BIT
;
53 if ( clip
[1] + clip
[3] < 0) mask
|= CLIP_BOTTOM_BIT
;
54 if (-clip
[2] + clip
[3] < 0) mask
|= CLIP_FAR_BIT
;
55 if ( clip
[2] + clip
[3] < 0) mask
|= CLIP_NEAR_BIT
;
57 /* Followed by any remaining ones:
59 for (i
= 6; i
< nr
; i
++) {
60 if (dot4(clip
, plane
[i
]) < 0)
69 vs_exec_prepare( struct draw_vertex_shader
*shader
,
70 struct draw_context
*draw
)
72 /* specify the vertex program to interpret/execute */
73 tgsi_exec_machine_bind_shader(&draw
->machine
,
78 draw_update_vertex_fetch( draw
);
83 * Transform vertices with the current vertex program/shader
84 * Up to four vertices can be shaded at a time.
85 * \param vbuffer the input vertex data
86 * \param elts indexes of four input vertices
87 * \param count number of vertices to shade [1..4]
88 * \param vOut array of pointers to four output vertices
91 vs_exec_run( struct draw_vertex_shader
*shader
,
92 struct draw_context
*draw
,
95 struct vertex_header
*vOut
[] )
97 struct tgsi_exec_machine
*machine
= &draw
->machine
;
100 ALIGN16_DECL(struct tgsi_exec_vector
, inputs
, PIPE_ATTRIB_MAX
);
101 ALIGN16_DECL(struct tgsi_exec_vector
, outputs
, PIPE_ATTRIB_MAX
);
102 const float *scale
= draw
->viewport
.scale
;
103 const float *trans
= draw
->viewport
.translate
;
106 assert(draw
->vertex_shader
->info
.output_semantic_name
[0]
107 == TGSI_SEMANTIC_POSITION
);
109 machine
->Consts
= (float (*)[4]) draw
->user
.constants
;
110 machine
->Inputs
= ALIGN16_ASSIGN(inputs
);
111 machine
->Outputs
= ALIGN16_ASSIGN(outputs
);
113 draw
->vertex_fetch
.fetch_func( draw
, machine
, elts
, count
);
115 /* run interpreter */
116 tgsi_exec_machine_run( machine
);
119 /* store machine results */
120 for (j
= 0; j
< count
; j
++) {
124 /* Handle attr[0] (position) specially:
126 * XXX: Computing the clipmask should be done in the vertex
127 * program as a set of DP4 instructions appended to the
128 * user-provided code.
130 x
= vOut
[j
]->clip
[0] = machine
->Outputs
[0].xyzw
[0].f
[j
];
131 y
= vOut
[j
]->clip
[1] = machine
->Outputs
[0].xyzw
[1].f
[j
];
132 z
= vOut
[j
]->clip
[2] = machine
->Outputs
[0].xyzw
[2].f
[j
];
133 w
= vOut
[j
]->clip
[3] = machine
->Outputs
[0].xyzw
[3].f
[j
];
135 if (!draw
->rasterizer
->bypass_clipping
) {
136 vOut
[j
]->clipmask
= compute_clipmask(vOut
[j
]->clip
, draw
->plane
, draw
->nr_planes
);
137 vOut
[j
]->edgeflag
= 1;
145 /* Viewport mapping */
146 vOut
[j
]->data
[0][0] = x
* scale
[0] + trans
[0];
147 vOut
[j
]->data
[0][1] = y
* scale
[1] + trans
[1];
148 vOut
[j
]->data
[0][2] = z
* scale
[2] + trans
[2];
149 vOut
[j
]->data
[0][3] = w
;
152 vOut
[j
]->clipmask
= 0;
153 vOut
[j
]->edgeflag
= 1;
154 vOut
[j
]->data
[0][0] = x
;
155 vOut
[j
]->data
[0][1] = y
;
156 vOut
[j
]->data
[0][2] = z
;
157 vOut
[j
]->data
[0][3] = w
;
160 /* Remaining attributes are packed into sequential post-transform
161 * vertex attrib slots.
163 for (slot
= 1; slot
< draw
->num_vs_outputs
; slot
++) {
164 vOut
[j
]->data
[slot
][0] = machine
->Outputs
[slot
].xyzw
[0].f
[j
];
165 vOut
[j
]->data
[slot
][1] = machine
->Outputs
[slot
].xyzw
[1].f
[j
];
166 vOut
[j
]->data
[slot
][2] = machine
->Outputs
[slot
].xyzw
[2].f
[j
];
167 vOut
[j
]->data
[slot
][3] = machine
->Outputs
[slot
].xyzw
[3].f
[j
];
171 printf("Post xform vert:\n");
172 for (slot
= 0; slot
< draw
->num_vs_outputs
; slot
++) {
173 printf("%d: %f %f %f %f\n", slot
,
174 vOut
[j
]->data
[slot
][0],
175 vOut
[j
]->data
[slot
][1],
176 vOut
[j
]->data
[slot
][2],
177 vOut
[j
]->data
[slot
][3]);
182 } /* loop over vertices */
188 vs_exec_delete( struct draw_vertex_shader
*dvs
)
194 struct draw_vertex_shader
*
195 draw_create_vs_exec(struct draw_context
*draw
,
196 const struct pipe_shader_state
*state
)
198 struct draw_vertex_shader
*vs
= CALLOC_STRUCT( draw_vertex_shader
);
204 vs
->prepare
= vs_exec_prepare
;
205 vs
->run
= vs_exec_run
;
206 vs
->delete = vs_exec_delete
;