diff options
| -rw-r--r-- | src/gallium/auxiliary/Makefile.sources | 2 | ||||
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_aa_point.c | 309 | ||||
| -rw-r--r-- | src/gallium/auxiliary/tgsi/tgsi_aa_point.h | 35 |
3 files changed, 346 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources index cc6fe7d3ae3..56fa84055b7 100644 --- a/src/gallium/auxiliary/Makefile.sources +++ b/src/gallium/auxiliary/Makefile.sources @@ -129,6 +129,8 @@ C_SOURCES := \ rtasm/rtasm_execmem.h \ rtasm/rtasm_x86sse.c \ rtasm/rtasm_x86sse.h \ + tgsi/tgsi_aa_point.c \ + tgsi/tgsi_aa_point.h \ tgsi/tgsi_build.c \ tgsi/tgsi_build.h \ tgsi/tgsi_dump.c \ diff --git a/src/gallium/auxiliary/tgsi/tgsi_aa_point.c b/src/gallium/auxiliary/tgsi/tgsi_aa_point.c new file mode 100644 index 00000000000..9016effd388 --- /dev/null +++ b/src/gallium/auxiliary/tgsi/tgsi_aa_point.c @@ -0,0 +1,309 @@ +/* + * Copyright 2014 VMware, Inc. + * 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, sub license, 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 NON-INFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS 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. + */ + + +/** + * This utility transforms the fragment shader to support anti-aliasing points. + */ + +#include "util/u_debug.h" +#include "util/u_math.h" +#include "tgsi_info.h" +#include "tgsi_aa_point.h" +#include "tgsi_transform.h" + +#define INVALID_INDEX 9999 + +struct aa_transform_context +{ + struct tgsi_transform_context base; + + unsigned tmp; // temp register + unsigned color_out; // frag color out register + unsigned color_tmp; // frag color temp register + unsigned num_tmp; // number of temp registers + unsigned num_imm; // number of immediates + unsigned num_input; // number of inputs + unsigned aa_point_coord_index; +}; + +static inline struct aa_transform_context * +aa_transform_context(struct tgsi_transform_context *ctx) +{ + return (struct aa_transform_context *) ctx; +} + +/** + * TGSI declaration transform callback. + */ +static void +aa_decl(struct tgsi_transform_context *ctx, + struct tgsi_full_declaration *decl) +{ + struct aa_transform_context *ts = aa_transform_context(ctx); + + if (decl->Declaration.File == TGSI_FILE_OUTPUT && + decl->Semantic.Name == TGSI_SEMANTIC_COLOR && + decl->Semantic.Index == 0) { + ts->color_out = decl->Range.First; + } + else if (decl->Declaration.File == TGSI_FILE_INPUT) { + ts->num_input++; + } + else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) { + ts->num_tmp = MAX2(ts->num_tmp, decl->Range.Last + 1); + } + + ctx->emit_declaration(ctx, decl); +} + +/** + * TGSI immediate declaration transform callback. + */ +static void +aa_immediate(struct tgsi_transform_context *ctx, + struct tgsi_full_immediate *imm) +{ + struct aa_transform_context *ts = aa_transform_context(ctx); + + ctx->emit_immediate(ctx, imm); + ts->num_imm++; +} + +/** + * TGSI transform prolog callback. + */ +static void +aa_prolog(struct tgsi_transform_context *ctx) +{ + struct aa_transform_context *ts = aa_transform_context(ctx); + unsigned tmp0; + unsigned texIn; + unsigned imm; + + /* Declare two temporary registers, one for temporary and + * one for color. + */ + ts->tmp = ts->num_tmp++; + ts->color_tmp = ts->num_tmp++; + + tgsi_transform_temps_decl(ctx, ts->tmp, ts->color_tmp); + + /* Declare new generic input/texcoord */ + texIn = ts->num_input++; + tgsi_transform_input_decl(ctx, texIn, TGSI_SEMANTIC_GENERIC, + ts->aa_point_coord_index, TGSI_INTERPOLATE_LINEAR); + + /* Declare extra immediates */ + imm = ts->num_imm++; + tgsi_transform_immediate_decl(ctx, 0.5, 0.5, 0.45, 1.0); + + /* + * Emit code to compute fragment coverage. + * The point always has radius 0.5. The threshold value will be a + * value less than, but close to 0.5, such as 0.45. + * We compute a coverage factor from the distance and threshold. + * If the coverage is negative, the fragment is outside the circle and + * it's discarded. + * If the coverage is >= 1, the fragment is fully inside the threshold + * distance. We limit/clamp the coverage to 1. + * Otherwise, the fragment is between the threshold value and 0.5 and we + * compute a coverage value in [0,1]. + * + * Input reg (texIn) usage: + * texIn.x = x point coord in [0,1] + * texIn.y = y point coord in [0,1] + * texIn.z = "k" the smoothing threshold distance + * texIn.w = unused + * + * Temp reg (t0) usage: + * t0.x = distance of fragment from center point + * t0.y = boolean, is t0.x > 0.5, also misc temp usage + * t0.z = temporary for computing 1/(0.5-k) value + * t0.w = final coverage value + */ + + tmp0 = ts->tmp; + + /* SUB t0.xy, texIn, (0.5, 0,5) */ + tgsi_transform_op2_inst(ctx, TGSI_OPCODE_SUB, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_XY, + TGSI_FILE_INPUT, texIn, + TGSI_FILE_IMMEDIATE, imm); + + /* DP2 t0.x, t0.xy, t0.xy; # t0.x = x^2 + y^2 */ + tgsi_transform_op2_inst(ctx, TGSI_OPCODE_DP2, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_X, + TGSI_FILE_TEMPORARY, tmp0, + TGSI_FILE_TEMPORARY, tmp0); + + /* SQRT t0.x, t0.x */ + tgsi_transform_op1_inst(ctx, TGSI_OPCODE_SQRT, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_X, + TGSI_FILE_TEMPORARY, tmp0); + + /* compute coverage factor = (0.5-d)/(0.5-k) */ + + /* SUB t0.w, 0.5, texIn.z; # t0.w = 0.5-k */ + tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_SUB, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_W, + TGSI_FILE_IMMEDIATE, imm, TGSI_SWIZZLE_X, + TGSI_FILE_INPUT, texIn, TGSI_SWIZZLE_Z); + + /* SUB t0.y, 0.5, t0.x; # t0.y = 0.5-d */ + tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_SUB, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_Y, + TGSI_FILE_IMMEDIATE, imm, TGSI_SWIZZLE_X, + TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_X); + + /* DIV t0.w, t0.y, t0.w; # coverage = (0.5-d)/(0.5-k) */ + tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_DIV, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_W, + TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_Y, + TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_W); + + /* If the coverage value is negative, it means the fragment is outside + * the point's circular boundary. Kill it. + */ + /* KILL_IF tmp0.w; # if tmp0.w < 0 KILL */ + tgsi_transform_kill_inst(ctx, TGSI_FILE_TEMPORARY, tmp0, + TGSI_SWIZZLE_W, FALSE); + + /* If the distance is less than the threshold, the coverage/alpha value + * will be greater than one. Clamp to one here. + */ + /* MIN tmp0.w, tmp0.w, 1.0 */ + tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MIN, + TGSI_FILE_TEMPORARY, tmp0, TGSI_WRITEMASK_W, + TGSI_FILE_TEMPORARY, tmp0, TGSI_SWIZZLE_W, + TGSI_FILE_IMMEDIATE, imm, TGSI_SWIZZLE_W); +} + +/** + * TGSI instruction transform callback. + */ +static void +aa_inst(struct tgsi_transform_context *ctx, + struct tgsi_full_instruction *inst) +{ + struct aa_transform_context *ts = aa_transform_context(ctx); + unsigned i; + + /* Look for writes to color output reg and replace it with + * color temp reg. + */ + for (i = 0; i < inst->Instruction.NumDstRegs; i++) { + struct tgsi_full_dst_register *dst = &inst->Dst[i]; + if (dst->Register.File == TGSI_FILE_OUTPUT && + dst->Register.Index == ts->color_out) { + dst->Register.File = TGSI_FILE_TEMPORARY; + dst->Register.Index = ts->color_tmp; + } + } + + ctx->emit_instruction(ctx, inst); +} + +/** + * TGSI transform epilog callback. + */ +static void +aa_epilog(struct tgsi_transform_context *ctx) +{ + struct aa_transform_context *ts = aa_transform_context(ctx); + + /* add alpha modulation code at tail of program */ + assert(ts->color_out != INVALID_INDEX); + assert(ts->color_tmp != INVALID_INDEX); + + /* MOV output.color.xyz colorTmp */ + tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV, + TGSI_FILE_OUTPUT, ts->color_out, + TGSI_WRITEMASK_XYZ, + TGSI_FILE_TEMPORARY, ts->color_tmp); + + /* MUL output.color.w colorTmp.w tmp0.w */ + tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL, + TGSI_FILE_OUTPUT, ts->color_out, + TGSI_WRITEMASK_W, + TGSI_FILE_TEMPORARY, ts->color_tmp, + TGSI_FILE_TEMPORARY, ts->tmp); +} + +/** + * TGSI utility to transform a fragment shader to support antialiasing point. + * + * This utility accepts two inputs: + *\param tokens_in -- the original token string of the shader + *\param aa_point_coord_index -- the semantic index of the generic register + * that contains the point sprite texture coord + * + * For each fragment in the point, we compute the distance of the fragment + * from the point center using the point sprite texture coordinates. + * If the distance is greater than 0.5, we'll discard the fragment. + * Otherwise, we'll compute a coverage value which approximates how much + * of the fragment is inside the bounding circle of the point. If the distance + * is less than 'k', the coverage is 1. Else, the coverage is between 0 and 1. + * The final fragment color's alpha channel is then modulated by the coverage + * value. + */ +struct tgsi_token * +tgsi_add_aa_point(const struct tgsi_token *tokens_in, + const int aa_point_coord_index) +{ + struct aa_transform_context transform; + const uint num_new_tokens = 200; /* should be enough */ + const uint new_len = tgsi_num_tokens(tokens_in) + num_new_tokens; + struct tgsi_token *new_tokens; + + /* allocate new tokens buffer */ + new_tokens = tgsi_alloc_tokens(new_len); + if (!new_tokens) + return NULL; + + /* setup transformation context */ + memset(&transform, 0, sizeof(transform)); + transform.base.transform_declaration = aa_decl; + transform.base.transform_instruction = aa_inst; + transform.base.transform_immediate = aa_immediate; + transform.base.prolog = aa_prolog; + transform.base.epilog = aa_epilog; + + transform.tmp = INVALID_INDEX; + transform.color_out = INVALID_INDEX; + transform.color_tmp = INVALID_INDEX; + + assert(aa_point_coord_index != -1); + transform.aa_point_coord_index = (unsigned)aa_point_coord_index; + + transform.num_tmp = 0; + transform.num_imm = 0; + transform.num_input = 0; + + /* transform the shader */ + tgsi_transform_shader(tokens_in, new_tokens, new_len, &transform.base); + + return new_tokens; +} diff --git a/src/gallium/auxiliary/tgsi/tgsi_aa_point.h b/src/gallium/auxiliary/tgsi/tgsi_aa_point.h new file mode 100644 index 00000000000..d89f40cc389 --- /dev/null +++ b/src/gallium/auxiliary/tgsi/tgsi_aa_point.h @@ -0,0 +1,35 @@ +/* + * Copyright 2014 VMware, Inc. + * 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, sub license, 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 NON-INFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS 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. + */ + +#ifndef TGSI_AA_POINT_H +#define TGSI_AA_POINT_H + +struct tgsi_token; + +struct tgsi_token * +tgsi_add_aa_point(const struct tgsi_token *tokens_in, + const int aa_point_coord_index); + +#endif /* TGSI_AA_POINT_H */ |