diff options
Diffstat (limited to 'src/mesa/drivers/dri/r300/compiler/r300_fragprog_swizzle.c')
| -rw-r--r-- | src/mesa/drivers/dri/r300/compiler/r300_fragprog_swizzle.c | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/r300/compiler/r300_fragprog_swizzle.c b/src/mesa/drivers/dri/r300/compiler/r300_fragprog_swizzle.c new file mode 100644 index 00000000000..1b14cc3888b --- /dev/null +++ b/src/mesa/drivers/dri/r300/compiler/r300_fragprog_swizzle.c @@ -0,0 +1,223 @@ +/* + * Copyright (C) 2008 Nicolai Haehnle. + * + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial + * portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ + +/** + * @file + * Utilities to deal with the somewhat odd restriction on R300 fragment + * program swizzles. + */ + +#include "r300_fragprog_swizzle.h" + +#include "../r300_reg.h" +#include "radeon_nqssadce.h" +#include "radeon_compiler.h" + +#define MAKE_SWZ3(x, y, z) (MAKE_SWIZZLE4(SWIZZLE_##x, SWIZZLE_##y, SWIZZLE_##z, SWIZZLE_ZERO)) + +struct swizzle_data { + GLuint hash; /**< swizzle value this matches */ + GLuint base; /**< base value for hw swizzle */ + GLuint stride; /**< difference in base between arg0/1/2 */ +}; + +static const struct swizzle_data native_swizzles[] = { + {MAKE_SWZ3(X, Y, Z), R300_ALU_ARGC_SRC0C_XYZ, 4}, + {MAKE_SWZ3(X, X, X), R300_ALU_ARGC_SRC0C_XXX, 4}, + {MAKE_SWZ3(Y, Y, Y), R300_ALU_ARGC_SRC0C_YYY, 4}, + {MAKE_SWZ3(Z, Z, Z), R300_ALU_ARGC_SRC0C_ZZZ, 4}, + {MAKE_SWZ3(W, W, W), R300_ALU_ARGC_SRC0A, 1}, + {MAKE_SWZ3(Y, Z, X), R300_ALU_ARGC_SRC0C_YZX, 1}, + {MAKE_SWZ3(Z, X, Y), R300_ALU_ARGC_SRC0C_ZXY, 1}, + {MAKE_SWZ3(W, Z, Y), R300_ALU_ARGC_SRC0CA_WZY, 1}, + {MAKE_SWZ3(ONE, ONE, ONE), R300_ALU_ARGC_ONE, 0}, + {MAKE_SWZ3(ZERO, ZERO, ZERO), R300_ALU_ARGC_ZERO, 0} +}; + +static const int num_native_swizzles = sizeof(native_swizzles)/sizeof(native_swizzles[0]); + + +/** + * Find a native RGB swizzle that matches the given swizzle. + * Returns 0 if none found. + */ +static const struct swizzle_data* lookup_native_swizzle(GLuint swizzle) +{ + int i, comp; + + for(i = 0; i < num_native_swizzles; ++i) { + const struct swizzle_data* sd = &native_swizzles[i]; + for(comp = 0; comp < 3; ++comp) { + GLuint swz = GET_SWZ(swizzle, comp); + if (swz == SWIZZLE_NIL) + continue; + if (swz != GET_SWZ(sd->hash, comp)) + break; + } + if (comp == 3) + return sd; + } + + return 0; +} + + +/** + * Check whether the given instruction supports the swizzle and negate + * combinations in the given source register. + */ +GLboolean r300FPIsNativeSwizzle(GLuint opcode, struct prog_src_register reg) +{ + if (reg.Abs) + reg.Negate = NEGATE_NONE; + + if (opcode == OPCODE_KIL || + opcode == OPCODE_TEX || + opcode == OPCODE_TXB || + opcode == OPCODE_TXP) { + int j; + + if (reg.Abs || reg.Negate) + return GL_FALSE; + + for(j = 0; j < 4; ++j) { + GLuint swz = GET_SWZ(reg.Swizzle, j); + if (swz == SWIZZLE_NIL) + continue; + if (swz != j) + return GL_FALSE; + } + + return GL_TRUE; + } + + GLuint relevant = 0; + int j; + + for(j = 0; j < 3; ++j) + if (GET_SWZ(reg.Swizzle, j) != SWIZZLE_NIL) + relevant |= 1 << j; + + if ((reg.Negate & relevant) && ((reg.Negate & relevant) != relevant)) + return GL_FALSE; + + if (!lookup_native_swizzle(reg.Swizzle)) + return GL_FALSE; + + return GL_TRUE; +} + + +/** + * Generate MOV dst, src using only native swizzles. + */ +void r300FPBuildSwizzle(struct nqssadce_state *s, struct prog_dst_register dst, struct prog_src_register src) +{ + if (src.Abs) + src.Negate = NEGATE_NONE; + + while(dst.WriteMask) { + const struct swizzle_data *best_swizzle = 0; + GLuint best_matchcount = 0; + GLuint best_matchmask = 0; + int i, comp; + + for(i = 0; i < num_native_swizzles; ++i) { + const struct swizzle_data *sd = &native_swizzles[i]; + GLuint matchcount = 0; + GLuint matchmask = 0; + for(comp = 0; comp < 3; ++comp) { + if (!GET_BIT(dst.WriteMask, comp)) + continue; + GLuint swz = GET_SWZ(src.Swizzle, comp); + if (swz == SWIZZLE_NIL) + continue; + if (swz == GET_SWZ(sd->hash, comp)) { + /* check if the negate bit of current component + * is the same for already matched components */ + if (matchmask && (!!(src.Negate & matchmask) != !!(src.Negate & (1 << comp)))) + continue; + + matchcount++; + matchmask |= 1 << comp; + } + } + if (matchcount > best_matchcount) { + best_swizzle = sd; + best_matchcount = matchcount; + best_matchmask = matchmask; + if (matchmask == (dst.WriteMask & WRITEMASK_XYZ)) + break; + } + } + + struct rc_instruction *inst = rc_insert_new_instruction(s->Compiler, s->IP->Prev); + inst->I.Opcode = OPCODE_MOV; + inst->I.DstReg = dst; + inst->I.DstReg.WriteMask &= (best_matchmask | WRITEMASK_W); + inst->I.SrcReg[0] = src; + inst->I.SrcReg[0].Negate = (best_matchmask & src.Negate) ? NEGATE_XYZW : NEGATE_NONE; + /* Note: We rely on NqSSA/DCE to set unused swizzle components to NIL */ + + dst.WriteMask &= ~inst->I.DstReg.WriteMask; + } +} + + +/** + * Translate an RGB (XYZ) swizzle into the hardware code for the given + * instruction source. + */ +GLuint r300FPTranslateRGBSwizzle(GLuint src, GLuint swizzle) +{ + const struct swizzle_data* sd = lookup_native_swizzle(swizzle); + + if (!sd) { + _mesa_printf("Not a native swizzle: %08x\n", swizzle); + return 0; + } + + return sd->base + src*sd->stride; +} + + +/** + * Translate an Alpha (W) swizzle into the hardware code for the given + * instruction source. + */ +GLuint r300FPTranslateAlphaSwizzle(GLuint src, GLuint swizzle) +{ + if (swizzle < 3) + return swizzle + 3*src; + + switch(swizzle) { + case SWIZZLE_W: return R300_ALU_ARGA_SRC0A + src; + case SWIZZLE_ONE: return R300_ALU_ARGA_ONE; + case SWIZZLE_ZERO: return R300_ALU_ARGA_ZERO; + default: return R300_ALU_ARGA_ONE; + } +} |