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| /************************************************************************** |
| * |
| * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas. |
| * Copyright 2010 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 TUNGSTEN GRAPHICS 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. |
| * |
| **************************************************************************/ |
| |
| /** |
| * Polygon stipple helper module. Drivers/GPUs which don't support polygon |
| * stipple natively can use this module to simulate it. |
| * |
| * Basically, modify fragment shader to sample the 32x32 stipple pattern |
| * texture and do a fragment kill for the 'off' bits. |
| * |
| * This was originally a 'draw' module stage, but since we don't need |
| * vertex window coords or anything, it can be a stand-alone utility module. |
| * |
| * Authors: Brian Paul |
| */ |
| |
| |
| #include "pipe/p_context.h" |
| #include "pipe/p_defines.h" |
| #include "pipe/p_shader_tokens.h" |
| #include "util/u_inlines.h" |
| |
| #include "util/u_format.h" |
| #include "util/u_memory.h" |
| #include "util/u_pstipple.h" |
| #include "util/u_sampler.h" |
| |
| #include "tgsi/tgsi_transform.h" |
| #include "tgsi/tgsi_dump.h" |
| #include "tgsi/tgsi_scan.h" |
| |
| /** Approx number of new tokens for instructions in pstip_transform_inst() */ |
| #define NUM_NEW_TOKENS 50 |
| |
| |
| static void |
| util_pstipple_update_stipple_texture(struct pipe_context *pipe, |
| struct pipe_resource *tex, |
| const uint32_t pattern[32]) |
| { |
| static const uint bit31 = 1 << 31; |
| struct pipe_transfer *transfer; |
| ubyte *data; |
| int i, j; |
| |
| /* map texture memory */ |
| data = pipe_transfer_map(pipe, tex, 0, 0, |
| PIPE_TRANSFER_WRITE, 0, 0, 32, 32, &transfer); |
| |
| /* |
| * Load alpha texture. |
| * Note: 0 means keep the fragment, 255 means kill it. |
| * We'll negate the texel value and use KILP which kills if value |
| * is negative. |
| */ |
| for (i = 0; i < 32; i++) { |
| for (j = 0; j < 32; j++) { |
| if (pattern[i] & (bit31 >> j)) { |
| /* fragment "on" */ |
| data[i * transfer->stride + j] = 0; |
| } |
| else { |
| /* fragment "off" */ |
| data[i * transfer->stride + j] = 255; |
| } |
| } |
| } |
| |
| /* unmap */ |
| pipe->transfer_unmap(pipe, transfer); |
| } |
| |
| |
| /** |
| * Create a 32x32 alpha8 texture that encodes the given stipple pattern. |
| */ |
| struct pipe_resource * |
| util_pstipple_create_stipple_texture(struct pipe_context *pipe, |
| const uint32_t pattern[32]) |
| { |
| struct pipe_screen *screen = pipe->screen; |
| struct pipe_resource templat, *tex; |
| |
| memset(&templat, 0, sizeof(templat)); |
| templat.target = PIPE_TEXTURE_2D; |
| templat.format = PIPE_FORMAT_A8_UNORM; |
| templat.last_level = 0; |
| templat.width0 = 32; |
| templat.height0 = 32; |
| templat.depth0 = 1; |
| templat.array_size = 1; |
| templat.bind = PIPE_BIND_SAMPLER_VIEW; |
| |
| tex = screen->resource_create(screen, &templat); |
| |
| if (tex) |
| util_pstipple_update_stipple_texture(pipe, tex, pattern); |
| |
| return tex; |
| } |
| |
| |
| /** |
| * Create sampler view to sample the stipple texture. |
| */ |
| struct pipe_sampler_view * |
| util_pstipple_create_sampler_view(struct pipe_context *pipe, |
| struct pipe_resource *tex) |
| { |
| struct pipe_sampler_view templat, *sv; |
| |
| u_sampler_view_default_template(&templat, tex, tex->format); |
| sv = pipe->create_sampler_view(pipe, tex, &templat); |
| |
| return sv; |
| } |
| |
| |
| /** |
| * Create the sampler CSO that'll be used for stippling. |
| */ |
| void * |
| util_pstipple_create_sampler(struct pipe_context *pipe) |
| { |
| struct pipe_sampler_state templat; |
| void *s; |
| |
| memset(&templat, 0, sizeof(templat)); |
| templat.wrap_s = PIPE_TEX_WRAP_REPEAT; |
| templat.wrap_t = PIPE_TEX_WRAP_REPEAT; |
| templat.wrap_r = PIPE_TEX_WRAP_REPEAT; |
| templat.min_mip_filter = PIPE_TEX_MIPFILTER_NONE; |
| templat.min_img_filter = PIPE_TEX_FILTER_NEAREST; |
| templat.mag_img_filter = PIPE_TEX_FILTER_NEAREST; |
| templat.normalized_coords = 1; |
| templat.min_lod = 0.0f; |
| templat.max_lod = 0.0f; |
| |
| s = pipe->create_sampler_state(pipe, &templat); |
| return s; |
| } |
| |
| |
| |
| /** |
| * Subclass of tgsi_transform_context, used for transforming the |
| * user's fragment shader to add the extra texture sample and fragment kill |
| * instructions. |
| */ |
| struct pstip_transform_context { |
| struct tgsi_transform_context base; |
| struct tgsi_shader_info info; |
| uint tempsUsed; /**< bitmask */ |
| int wincoordInput; |
| int maxInput; |
| uint samplersUsed; /**< bitfield of samplers used */ |
| int freeSampler; /** an available sampler for the pstipple */ |
| int texTemp; /**< temp registers */ |
| int numImmed; |
| boolean firstInstruction; |
| uint coordOrigin; |
| }; |
| |
| |
| /** |
| * TGSI declaration transform callback. |
| * Track samplers used, temps used, inputs used. |
| */ |
| static void |
| pstip_transform_decl(struct tgsi_transform_context *ctx, |
| struct tgsi_full_declaration *decl) |
| { |
| struct pstip_transform_context *pctx = |
| (struct pstip_transform_context *) ctx; |
| |
| /* XXX we can use tgsi_shader_info instead of some of this */ |
| |
| if (decl->Declaration.File == TGSI_FILE_SAMPLER) { |
| uint i; |
| for (i = decl->Range.First; i <= decl->Range.Last; i++) { |
| pctx->samplersUsed |= 1 << i; |
| } |
| } |
| else if (decl->Declaration.File == TGSI_FILE_INPUT) { |
| pctx->maxInput = MAX2(pctx->maxInput, (int) decl->Range.Last); |
| if (decl->Semantic.Name == TGSI_SEMANTIC_POSITION) |
| pctx->wincoordInput = (int) decl->Range.First; |
| } |
| else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) { |
| uint i; |
| for (i = decl->Range.First; i <= decl->Range.Last; i++) { |
| pctx->tempsUsed |= (1 << i); |
| } |
| } |
| |
| ctx->emit_declaration(ctx, decl); |
| } |
| |
| |
| static void |
| pstip_transform_immed(struct tgsi_transform_context *ctx, |
| struct tgsi_full_immediate *immed) |
| { |
| struct pstip_transform_context *pctx = |
| (struct pstip_transform_context *) ctx; |
| pctx->numImmed++; |
| } |
| |
| |
| /** |
| * Find the lowest zero bit in the given word, or -1 if bitfield is all ones. |
| */ |
| static int |
| free_bit(uint bitfield) |
| { |
| return ffs(~bitfield) - 1; |
| } |
| |
| |
| /** |
| * TGSI instruction transform callback. |
| * Before the first instruction, insert our new code to sample the |
| * stipple texture (using the fragment coord register) then kill the |
| * fragment if the stipple texture bit is off. |
| * |
| * Insert: |
| * declare new registers |
| * MUL texTemp, INPUT[wincoord], 1/32; |
| * TEX texTemp, texTemp, sampler; |
| * KIL -texTemp; # if -texTemp < 0, KILL fragment |
| * [...original code...] |
| */ |
| static void |
| pstip_transform_inst(struct tgsi_transform_context *ctx, |
| struct tgsi_full_instruction *inst) |
| { |
| struct pstip_transform_context *pctx = |
| (struct pstip_transform_context *) ctx; |
| |
| if (pctx->firstInstruction) { |
| /* emit our new declarations before the first instruction */ |
| |
| struct tgsi_full_declaration decl; |
| struct tgsi_full_instruction newInst; |
| uint i; |
| int wincoordInput; |
| |
| /* find free texture sampler */ |
| pctx->freeSampler = free_bit(pctx->samplersUsed); |
| if (pctx->freeSampler >= PIPE_MAX_SAMPLERS) |
| pctx->freeSampler = PIPE_MAX_SAMPLERS - 1; |
| |
| if (pctx->wincoordInput < 0) |
| wincoordInput = pctx->maxInput + 1; |
| else |
| wincoordInput = pctx->wincoordInput; |
| |
| /* find one free temp register */ |
| for (i = 0; i < 32; i++) { |
| if ((pctx->tempsUsed & (1 << i)) == 0) { |
| /* found a free temp */ |
| if (pctx->texTemp < 0) |
| pctx->texTemp = i; |
| else |
| break; |
| } |
| } |
| assert(pctx->texTemp >= 0); |
| |
| if (pctx->wincoordInput < 0) { |
| /* declare new position input reg */ |
| decl = tgsi_default_full_declaration(); |
| decl.Declaration.File = TGSI_FILE_INPUT; |
| decl.Declaration.Interpolate = 1; |
| decl.Declaration.Semantic = 1; |
| decl.Semantic.Name = TGSI_SEMANTIC_POSITION; |
| decl.Semantic.Index = 0; |
| decl.Range.First = |
| decl.Range.Last = wincoordInput; |
| decl.Interp.Interpolate = TGSI_INTERPOLATE_LINEAR; |
| ctx->emit_declaration(ctx, &decl); |
| } |
| |
| /* declare new sampler */ |
| decl = tgsi_default_full_declaration(); |
| decl.Declaration.File = TGSI_FILE_SAMPLER; |
| decl.Range.First = |
| decl.Range.Last = pctx->freeSampler; |
| ctx->emit_declaration(ctx, &decl); |
| |
| /* declare new temp regs */ |
| decl = tgsi_default_full_declaration(); |
| decl.Declaration.File = TGSI_FILE_TEMPORARY; |
| decl.Range.First = |
| decl.Range.Last = pctx->texTemp; |
| ctx->emit_declaration(ctx, &decl); |
| |
| /* emit immediate = {1/32, 1/32, 1, 1} |
| * The index/position of this immediate will be pctx->numImmed |
| */ |
| { |
| static const float value[4] = { 1.0/32, 1.0/32, 1.0, 1.0 }; |
| struct tgsi_full_immediate immed; |
| uint size = 4; |
| immed = tgsi_default_full_immediate(); |
| immed.Immediate.NrTokens = 1 + size; /* one for the token itself */ |
| immed.u[0].Float = value[0]; |
| immed.u[1].Float = value[1]; |
| immed.u[2].Float = value[2]; |
| immed.u[3].Float = value[3]; |
| ctx->emit_immediate(ctx, &immed); |
| } |
| |
| pctx->firstInstruction = FALSE; |
| |
| |
| /* |
| * Insert new MUL/TEX/KILP instructions at start of program |
| * Take gl_FragCoord, divide by 32 (stipple size), sample the |
| * texture and kill fragment if needed. |
| * |
| * We'd like to use non-normalized texcoords to index into a RECT |
| * texture, but we can only use REPEAT wrap mode with normalized |
| * texcoords. Darn. |
| */ |
| |
| /* XXX invert wincoord if origin isn't lower-left... */ |
| |
| /* MUL texTemp, INPUT[wincoord], 1/32; */ |
| newInst = tgsi_default_full_instruction(); |
| newInst.Instruction.Opcode = TGSI_OPCODE_MUL; |
| newInst.Instruction.NumDstRegs = 1; |
| newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY; |
| newInst.Dst[0].Register.Index = pctx->texTemp; |
| newInst.Instruction.NumSrcRegs = 2; |
| newInst.Src[0].Register.File = TGSI_FILE_INPUT; |
| newInst.Src[0].Register.Index = wincoordInput; |
| newInst.Src[1].Register.File = TGSI_FILE_IMMEDIATE; |
| newInst.Src[1].Register.Index = pctx->numImmed; |
| ctx->emit_instruction(ctx, &newInst); |
| |
| /* TEX texTemp, texTemp, sampler; */ |
| newInst = tgsi_default_full_instruction(); |
| newInst.Instruction.Opcode = TGSI_OPCODE_TEX; |
| newInst.Instruction.NumDstRegs = 1; |
| newInst.Dst[0].Register.File = TGSI_FILE_TEMPORARY; |
| newInst.Dst[0].Register.Index = pctx->texTemp; |
| newInst.Instruction.NumSrcRegs = 2; |
| newInst.Instruction.Texture = TRUE; |
| newInst.Texture.Texture = TGSI_TEXTURE_2D; |
| newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY; |
| newInst.Src[0].Register.Index = pctx->texTemp; |
| newInst.Src[1].Register.File = TGSI_FILE_SAMPLER; |
| newInst.Src[1].Register.Index = pctx->freeSampler; |
| ctx->emit_instruction(ctx, &newInst); |
| |
| /* KIL -texTemp; # if -texTemp < 0, KILL fragment */ |
| newInst = tgsi_default_full_instruction(); |
| newInst.Instruction.Opcode = TGSI_OPCODE_KIL; |
| newInst.Instruction.NumDstRegs = 0; |
| newInst.Instruction.NumSrcRegs = 1; |
| newInst.Src[0].Register.File = TGSI_FILE_TEMPORARY; |
| newInst.Src[0].Register.Index = pctx->texTemp; |
| newInst.Src[0].Register.Negate = 1; |
| ctx->emit_instruction(ctx, &newInst); |
| } |
| |
| /* emit this instruction */ |
| ctx->emit_instruction(ctx, inst); |
| } |
| |
| |
| /** |
| * Given a fragment shader, return a new fragment shader which |
| * samples a stipple texture and executes KILL. |
| */ |
| struct pipe_shader_state * |
| util_pstipple_create_fragment_shader(struct pipe_context *pipe, |
| struct pipe_shader_state *fs, |
| unsigned *samplerUnitOut) |
| { |
| struct pipe_shader_state *new_fs; |
| struct pstip_transform_context transform; |
| const uint newLen = tgsi_num_tokens(fs->tokens) + NUM_NEW_TOKENS; |
| unsigned i; |
| |
| new_fs = MALLOC(sizeof(*new_fs)); |
| if (!new_fs) |
| return NULL; |
| |
| new_fs->tokens = tgsi_alloc_tokens(newLen); |
| if (!new_fs->tokens) { |
| FREE(new_fs); |
| return NULL; |
| } |
| |
| /* Setup shader transformation info/context. |
| */ |
| memset(&transform, 0, sizeof(transform)); |
| transform.wincoordInput = -1; |
| transform.maxInput = -1; |
| transform.texTemp = -1; |
| transform.firstInstruction = TRUE; |
| transform.coordOrigin = TGSI_FS_COORD_ORIGIN_UPPER_LEFT; |
| transform.base.transform_instruction = pstip_transform_inst; |
| transform.base.transform_declaration = pstip_transform_decl; |
| transform.base.transform_immediate = pstip_transform_immed; |
| |
| tgsi_scan_shader(fs->tokens, &transform.info); |
| |
| /* find fragment coordinate origin property */ |
| for (i = 0; i < transform.info.num_properties; i++) { |
| if (transform.info.properties[i].name == TGSI_PROPERTY_FS_COORD_ORIGIN) |
| transform.coordOrigin = transform.info.properties[i].data[0]; |
| } |
| |
| tgsi_transform_shader(fs->tokens, |
| (struct tgsi_token *) new_fs->tokens, |
| newLen, &transform.base); |
| |
| #if 0 /* DEBUG */ |
| tgsi_dump(fs->tokens, 0); |
| tgsi_dump(new_fs->tokens, 0); |
| #endif |
| |
| assert(transform.freeSampler < PIPE_MAX_SAMPLERS); |
| *samplerUnitOut = transform.freeSampler; |
| |
| return new_fs; |
| } |
| |