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1 /*
2  * Copyright (C) 2008 Nicolai Haehnle.
3  *
4  * All Rights Reserved.
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 /**
29  * @file
30  * Utilities to deal with the somewhat odd restriction on R300 fragment
31  * program swizzles.
32  */
33 
34 #include "r300_fragprog_swizzle.h"
35 
36 #include <stdio.h>
37 
38 #include "../r300_reg.h"
39 #include "radeon_compiler.h"
40 
41 #define MAKE_SWZ3(x, y, z) (RC_MAKE_SWIZZLE(RC_SWIZZLE_##x, RC_SWIZZLE_##y, RC_SWIZZLE_##z, RC_SWIZZLE_ZERO))
42 
43 struct swizzle_data {
44 	unsigned int hash; /**< swizzle value this matches */
45 	unsigned int base; /**< base value for hw swizzle */
46 	unsigned int stride; /**< difference in base between arg0/1/2 */
47 	unsigned int srcp_stride; /**< difference in base between arg0/scrp */
48 };
49 
50 static const struct swizzle_data native_swizzles[] = {
51 	{MAKE_SWZ3(X, Y, Z), R300_ALU_ARGC_SRC0C_XYZ, 4, 15},
52 	{MAKE_SWZ3(X, X, X), R300_ALU_ARGC_SRC0C_XXX, 4, 15},
53 	{MAKE_SWZ3(Y, Y, Y), R300_ALU_ARGC_SRC0C_YYY, 4, 15},
54 	{MAKE_SWZ3(Z, Z, Z), R300_ALU_ARGC_SRC0C_ZZZ, 4, 15},
55 	{MAKE_SWZ3(W, W, W), R300_ALU_ARGC_SRC0A, 1, 7},
56 	{MAKE_SWZ3(Y, Z, X), R300_ALU_ARGC_SRC0C_YZX, 1, 0},
57 	{MAKE_SWZ3(Z, X, Y), R300_ALU_ARGC_SRC0C_ZXY, 1, 0},
58 	{MAKE_SWZ3(W, Z, Y), R300_ALU_ARGC_SRC0CA_WZY, 1, 0},
59 	{MAKE_SWZ3(ONE, ONE, ONE), R300_ALU_ARGC_ONE, 0, 0},
60 	{MAKE_SWZ3(ZERO, ZERO, ZERO), R300_ALU_ARGC_ZERO, 0, 0},
61 	{MAKE_SWZ3(HALF, HALF, HALF), R300_ALU_ARGC_HALF, 0, 0}
62 };
63 
64 static const int num_native_swizzles = sizeof(native_swizzles)/sizeof(native_swizzles[0]);
65 
66 /**
67  * Find a native RGB swizzle that matches the given swizzle.
68  * Returns 0 if none found.
69  */
lookup_native_swizzle(unsigned int swizzle)70 static const struct swizzle_data* lookup_native_swizzle(unsigned int swizzle)
71 {
72 	int i, comp;
73 
74 	for(i = 0; i < num_native_swizzles; ++i) {
75 		const struct swizzle_data* sd = &native_swizzles[i];
76 		for(comp = 0; comp < 3; ++comp) {
77 			unsigned int swz = GET_SWZ(swizzle, comp);
78 			if (swz == RC_SWIZZLE_UNUSED)
79 				continue;
80 			if (swz != GET_SWZ(sd->hash, comp))
81 				break;
82 		}
83 		if (comp == 3)
84 			return sd;
85 	}
86 
87 	return 0;
88 }
89 
90 /**
91  * Determines if the given swizzle is valid for r300/r400.  In most situations
92  * it is better to use r300_swizzle_is_native() which can be accesed via
93  * struct radeon_compiler *c; c->SwizzleCaps->IsNative().
94  */
r300_swizzle_is_native_basic(unsigned int swizzle)95 int r300_swizzle_is_native_basic(unsigned int swizzle)
96 {
97 	if(lookup_native_swizzle(swizzle))
98 		return 1;
99 	else
100 		return 0;
101 }
102 
103 /**
104  * Check whether the given instruction supports the swizzle and negate
105  * combinations in the given source register.
106  */
r300_swizzle_is_native(rc_opcode opcode,struct rc_src_register reg)107 static int r300_swizzle_is_native(rc_opcode opcode, struct rc_src_register reg)
108 {
109 	const struct swizzle_data* sd;
110 	unsigned int relevant;
111 	int j;
112 
113 	if (opcode == RC_OPCODE_KIL ||
114 	    opcode == RC_OPCODE_TEX ||
115 	    opcode == RC_OPCODE_TXB ||
116 	    opcode == RC_OPCODE_TXP) {
117 		if (reg.Abs || reg.Negate)
118 			return 0;
119 
120 		for(j = 0; j < 4; ++j) {
121 			unsigned int swz = GET_SWZ(reg.Swizzle, j);
122 			if (swz == RC_SWIZZLE_UNUSED)
123 				continue;
124 			if (swz != j)
125 				return 0;
126 		}
127 
128 		return 1;
129 	}
130 
131 	relevant = 0;
132 
133 	for(j = 0; j < 3; ++j)
134 		if (GET_SWZ(reg.Swizzle, j) != RC_SWIZZLE_UNUSED)
135 			relevant |= 1 << j;
136 
137 	if ((reg.Negate & relevant) && ((reg.Negate & relevant) != relevant))
138 		return 0;
139 
140 	sd = lookup_native_swizzle(reg.Swizzle);
141 	if (!sd || (reg.File == RC_FILE_PRESUB && sd->srcp_stride == 0))
142 		return 0;
143 
144 	return 1;
145 }
146 
147 
r300_swizzle_split(struct rc_src_register src,unsigned int mask,struct rc_swizzle_split * split)148 static void r300_swizzle_split(
149 		struct rc_src_register src, unsigned int mask,
150 		struct rc_swizzle_split * split)
151 {
152 	split->NumPhases = 0;
153 
154 	while(mask) {
155 		unsigned int best_matchcount = 0;
156 		unsigned int best_matchmask = 0;
157 		int i, comp;
158 
159 		for(i = 0; i < num_native_swizzles; ++i) {
160 			const struct swizzle_data *sd = &native_swizzles[i];
161 			unsigned int matchcount = 0;
162 			unsigned int matchmask = 0;
163 			for(comp = 0; comp < 3; ++comp) {
164 				unsigned int swz;
165 				if (!GET_BIT(mask, comp))
166 					continue;
167 				swz = GET_SWZ(src.Swizzle, comp);
168 				if (swz == RC_SWIZZLE_UNUSED)
169 					continue;
170 				if (swz == GET_SWZ(sd->hash, comp)) {
171 					/* check if the negate bit of current component
172 					 * is the same for already matched components */
173 					if (matchmask && (!!(src.Negate & matchmask) != !!(src.Negate & (1 << comp))))
174 						continue;
175 
176 					matchcount++;
177 					matchmask |= 1 << comp;
178 				}
179 			}
180 			if (matchcount > best_matchcount) {
181 				best_matchcount = matchcount;
182 				best_matchmask = matchmask;
183 				if (matchmask == (mask & RC_MASK_XYZ))
184 					break;
185 			}
186 		}
187 
188 		if (mask & RC_MASK_W)
189 			best_matchmask |= RC_MASK_W;
190 
191 		split->Phase[split->NumPhases++] = best_matchmask;
192 		mask &= ~best_matchmask;
193 	}
194 }
195 
196 struct rc_swizzle_caps r300_swizzle_caps = {
197 	.IsNative = r300_swizzle_is_native,
198 	.Split = r300_swizzle_split
199 };
200 
201 
202 /**
203  * Translate an RGB (XYZ) swizzle into the hardware code for the given
204  * instruction source.
205  */
r300FPTranslateRGBSwizzle(unsigned int src,unsigned int swizzle)206 unsigned int r300FPTranslateRGBSwizzle(unsigned int src, unsigned int swizzle)
207 {
208 	const struct swizzle_data* sd = lookup_native_swizzle(swizzle);
209 
210 	if (!sd || (src == RC_PAIR_PRESUB_SRC && sd->srcp_stride == 0)) {
211 		fprintf(stderr, "Not a native swizzle: %08x\n", swizzle);
212 		return 0;
213 	}
214 
215 	if (src == RC_PAIR_PRESUB_SRC) {
216 		return sd->base + sd->srcp_stride;
217 	} else {
218 		return sd->base + src*sd->stride;
219 	}
220 }
221 
222 
223 /**
224  * Translate an Alpha (W) swizzle into the hardware code for the given
225  * instruction source.
226  */
r300FPTranslateAlphaSwizzle(unsigned int src,unsigned int swizzle)227 unsigned int r300FPTranslateAlphaSwizzle(unsigned int src, unsigned int swizzle)
228 {
229 	unsigned int swz = GET_SWZ(swizzle, 0);
230 	if (src == RC_PAIR_PRESUB_SRC) {
231 		return R300_ALU_ARGA_SRCP_X + swz;
232 	}
233 	if (swz < 3)
234 		return swz + 3*src;
235 
236 	switch(swz) {
237 	case RC_SWIZZLE_W: return R300_ALU_ARGA_SRC0A + src;
238 	case RC_SWIZZLE_ONE: return R300_ALU_ARGA_ONE;
239 	case RC_SWIZZLE_ZERO: return R300_ALU_ARGA_ZERO;
240 	case RC_SWIZZLE_HALF: return R300_ALU_ARGA_HALF;
241 	default: return R300_ALU_ARGA_ONE;
242 	}
243 }
244