1 /*
2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
4 develop this 3D driver.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a 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, sublicense, 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
16 portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **********************************************************************/
27 /*
28 * Authors:
29 * Keith Whitwell <keith@tungstengraphics.com>
30 */
31
32
33 #include "main/macros.h"
34 #include "brw_context.h"
35 #include "brw_vs.h"
36
37 /* Component is active if it may diverge from [0,0,0,1]. Undef values
38 * are promoted to [0,0,0,1] for the purposes of this analysis.
39 */
40 struct tracker {
41 bool twoside;
42 GLubyte active[PROGRAM_OUTPUT+1][MAX_PROGRAM_TEMPS];
43 GLbitfield size_masks[4]; /**< one bit per fragment program input attrib */
44 };
45
46
set_active_component(struct tracker * t,GLuint file,GLuint index,GLubyte active)47 static void set_active_component( struct tracker *t,
48 GLuint file,
49 GLuint index,
50 GLubyte active )
51 {
52 switch (file) {
53 case PROGRAM_TEMPORARY:
54 case PROGRAM_INPUT:
55 case PROGRAM_OUTPUT:
56 assert(file < PROGRAM_OUTPUT + 1);
57 assert(index < Elements(t->active[0]));
58 t->active[file][index] |= active;
59 break;
60 default:
61 break;
62 }
63 }
64
set_active(struct tracker * t,struct prog_dst_register dst,GLuint active)65 static void set_active( struct tracker *t,
66 struct prog_dst_register dst,
67 GLuint active )
68 {
69 set_active_component( t, dst.File, dst.Index, active & dst.WriteMask );
70 }
71
72
get_active_component(struct tracker * t,GLuint file,GLuint index,GLuint component,GLubyte swz)73 static GLubyte get_active_component( struct tracker *t,
74 GLuint file,
75 GLuint index,
76 GLuint component,
77 GLubyte swz )
78 {
79 switch (swz) {
80 case SWIZZLE_ZERO:
81 return component < 3 ? 0 : (1<<component);
82 case SWIZZLE_ONE:
83 return component == 3 ? 0 : (1<<component);
84 default:
85 switch (file) {
86 case PROGRAM_TEMPORARY:
87 case PROGRAM_INPUT:
88 case PROGRAM_OUTPUT:
89 return t->active[file][index] & (1<<component);
90 default:
91 return 1 << component;
92 }
93 }
94 }
95
96
get_active(struct tracker * t,struct prog_src_register src)97 static GLubyte get_active( struct tracker *t,
98 struct prog_src_register src )
99 {
100 GLuint i;
101 GLubyte active = src.Negate; /* NOTE! */
102
103 if (src.RelAddr)
104 return 0xf;
105
106 for (i = 0; i < 4; i++)
107 active |= get_active_component(t, src.File, src.Index, i,
108 GET_SWZ(src.Swizzle, i));
109
110 return active;
111 }
112
113 /**
114 * Return the size (1,2,3 or 4) of the output/result for VERT_RESULT_idx.
115 */
get_output_size(struct tracker * t,GLuint idx)116 static GLubyte get_output_size( struct tracker *t,
117 GLuint idx )
118 {
119 GLubyte active;
120 assert(idx < VERT_RESULT_MAX);
121 active = t->active[PROGRAM_OUTPUT][idx];
122 if (active & (1<<3)) return 4;
123 if (active & (1<<2)) return 3;
124 if (active & (1<<1)) return 2;
125 if (active & (1<<0)) return 1;
126 return 0;
127 }
128
129 /* Note the potential copying that occurs in the setup program:
130 */
calc_sizes(struct tracker * t)131 static void calc_sizes( struct tracker *t )
132 {
133 GLint vertRes;
134
135 if (t->twoside) {
136 t->active[PROGRAM_OUTPUT][VERT_RESULT_COL0] |=
137 t->active[PROGRAM_OUTPUT][VERT_RESULT_BFC0];
138
139 t->active[PROGRAM_OUTPUT][VERT_RESULT_COL1] |=
140 t->active[PROGRAM_OUTPUT][VERT_RESULT_BFC1];
141 }
142
143 /* Examine vertex program output sizes to set the size_masks[] info
144 * which describes the fragment program input sizes.
145 */
146 for (vertRes = 0; vertRes < VERT_RESULT_MAX; vertRes++) {
147
148 /* map vertex program output index to fragment program input index */
149 GLint fragAttrib = _mesa_vert_result_to_frag_attrib(vertRes);
150 if (fragAttrib < 0)
151 continue;
152
153 switch (get_output_size(t, vertRes)) {
154 case 4: t->size_masks[4-1] |= 1 << fragAttrib;
155 case 3: t->size_masks[3-1] |= 1 << fragAttrib;
156 case 2: t->size_masks[2-1] |= 1 << fragAttrib;
157 case 1: t->size_masks[1-1] |= 1 << fragAttrib;
158 break;
159 }
160 }
161 }
162
163 static GLubyte szflag[4+1] = {
164 0,
165 0x1,
166 0x3,
167 0x7,
168 0xf
169 };
170
171 /* Pull a size out of the packed array:
172 */
get_input_size(struct brw_context * brw,GLuint attr)173 static GLuint get_input_size(struct brw_context *brw,
174 GLuint attr)
175 {
176 GLuint sizes_dword = brw->vb.info.sizes[attr/16];
177 GLuint sizes_bits = (sizes_dword>>((attr%16)*2)) & 0x3;
178 return sizes_bits + 1;
179 /* return brw->vb.inputs[attr].glarray->Size; */
180 }
181
182 /* Calculate sizes of vertex program outputs. Size is the largest
183 * component index which might vary from [0,0,0,1]
184 */
calc_wm_input_sizes(struct brw_context * brw)185 static void calc_wm_input_sizes( struct brw_context *brw )
186 {
187 struct gl_context *ctx = &brw->intel.ctx;
188 /* BRW_NEW_VERTEX_PROGRAM */
189 const struct brw_vertex_program *vp =
190 brw_vertex_program_const(brw->vertex_program);
191 /* BRW_NEW_INPUT_DIMENSIONS */
192 struct tracker t;
193 GLuint insn;
194 GLuint i;
195
196 /* Mesa IR is not generated for GLSL vertex shaders. If there's no Mesa
197 * IR, the code below cannot determine which output components are
198 * written. So, skip it and assume everything is written. This
199 * circumvents some optimizations in the fragment shader, but it guarantees
200 * that correct code is generated.
201 */
202 if (vp->program.Base.NumInstructions == 0) {
203 brw->wm.input_size_masks[0] = ~0;
204 brw->wm.input_size_masks[1] = ~0;
205 brw->wm.input_size_masks[2] = ~0;
206 brw->wm.input_size_masks[3] = ~0;
207 return;
208 }
209
210
211 memset(&t, 0, sizeof(t));
212
213 /* _NEW_LIGHT | _NEW_PROGRAM */
214 if (ctx->VertexProgram._TwoSideEnabled)
215 t.twoside = 1;
216
217 for (i = 0; i < VERT_ATTRIB_MAX; i++)
218 if (vp->program.Base.InputsRead & BITFIELD64_BIT(i))
219 set_active_component(&t, PROGRAM_INPUT, i,
220 szflag[get_input_size(brw, i)]);
221
222 for (insn = 0; insn < vp->program.Base.NumInstructions; insn++) {
223 struct prog_instruction *inst = &vp->program.Base.Instructions[insn];
224
225 switch (inst->Opcode) {
226 case OPCODE_ARL:
227 break;
228
229 case OPCODE_MOV:
230 set_active(&t, inst->DstReg, get_active(&t, inst->SrcReg[0]));
231 break;
232
233 default:
234 set_active(&t, inst->DstReg, 0xf);
235 break;
236 }
237 }
238
239 calc_sizes(&t);
240
241 if (memcmp(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks)) != 0) {
242 memcpy(brw->wm.input_size_masks, t.size_masks, sizeof(t.size_masks));
243 brw->state.dirty.brw |= BRW_NEW_WM_INPUT_DIMENSIONS;
244 }
245 }
246
247 const struct brw_tracked_state brw_wm_input_sizes = {
248 .dirty = {
249 .mesa = _NEW_LIGHT | _NEW_PROGRAM,
250 .brw = BRW_NEW_VERTEX_PROGRAM | BRW_NEW_INPUT_DIMENSIONS,
251 .cache = 0
252 },
253 .emit = calc_wm_input_sizes
254 };
255
256