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mesa/src/gallium/auxiliary/util/u_pstipple.c

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/**************************************************************************
*
* Copyright 2008 VMware, Inc.
* 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 VMWARE 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/format/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 53
void
util_pstipple_update_stipple_texture(struct pipe_context *pipe,
struct pipe_resource *tex,
const uint32_t pattern[32])
{
static const uint bit31 = 1u << 31;
struct pipe_transfer *transfer;
ubyte *data;
int i, j;
/* map texture memory */
data = pipe_texture_map(pipe, tex, 0, 0,
PIPE_MAP_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 KILL_IF 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->texture_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 && pattern)
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;
unsigned wincoordFile;
int maxInput;
uint samplersUsed; /**< bitfield of samplers used */
int freeSampler; /** an available sampler for the pstipple */
int numImmed;
uint coordOrigin;
unsigned fixedUnit;
bool hasFixedUnit;
};
/**
* 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 |= 1u << i;
}
}
else if (decl->Declaration.File == pctx->wincoordFile) {
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++;
ctx->emit_immediate(ctx, immed);
}
/**
* 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 transform prolog
* 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;
* KILL_IF -texTemp; # if -texTemp < 0, kill fragment
* [...original code...]
*/
static void
pstip_transform_prolog(struct tgsi_transform_context *ctx)
{
struct pstip_transform_context *pctx =
(struct pstip_transform_context *) ctx;
int wincoordInput;
int texTemp;
int sampIdx;
STATIC_ASSERT(sizeof(pctx->samplersUsed) * 8 >= PIPE_MAX_SAMPLERS);
/* find free texture sampler */
pctx->freeSampler = free_bit(pctx->samplersUsed);
if (pctx->freeSampler < 0 || pctx->freeSampler >= PIPE_MAX_SAMPLERS)
pctx->freeSampler = PIPE_MAX_SAMPLERS - 1;
if (pctx->wincoordInput < 0)
wincoordInput = pctx->maxInput + 1;
else
wincoordInput = pctx->wincoordInput;
if (pctx->wincoordInput < 0) {
struct tgsi_full_declaration decl;
decl = tgsi_default_full_declaration();
/* declare new position input reg */
decl.Declaration.File = pctx->wincoordFile;
decl.Declaration.Semantic = 1;
decl.Semantic.Name = TGSI_SEMANTIC_POSITION;
decl.Range.First =
decl.Range.Last = wincoordInput;
if (pctx->wincoordFile == TGSI_FILE_INPUT) {
decl.Declaration.Interpolate = 1;
decl.Interp.Interpolate = TGSI_INTERPOLATE_LINEAR;
}
ctx->emit_declaration(ctx, &decl);
}
sampIdx = pctx->hasFixedUnit ? (int)pctx->fixedUnit : pctx->freeSampler;
/* declare new sampler */
tgsi_transform_sampler_decl(ctx, sampIdx);
/* if the src shader has SVIEW decl's for each SAMP decl, we
* need to continue the trend and ensure there is a matching
* SVIEW for the new SAMP we just created
*/
if (pctx->info.file_max[TGSI_FILE_SAMPLER_VIEW] != -1) {
tgsi_transform_sampler_view_decl(ctx,
sampIdx,
TGSI_TEXTURE_2D,
TGSI_RETURN_TYPE_FLOAT);
}
/* Declare temp[0] reg if not already declared.
* We can always use temp[0] since this code is before
* the rest of the shader.
*/
texTemp = 0;
if ((pctx->tempsUsed & (1 << texTemp)) == 0) {
tgsi_transform_temp_decl(ctx, texTemp);
}
/* emit immediate = {1/32, 1/32, 1, 1}
* The index/position of this immediate will be pctx->numImmed
*/
tgsi_transform_immediate_decl(ctx, 1.0/32.0, 1.0/32.0, 1.0, 1.0);
/*
* Insert new MUL/TEX/KILL_IF 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; */
tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL,
TGSI_FILE_TEMPORARY, texTemp,
TGSI_WRITEMASK_XYZW,
pctx->wincoordFile, wincoordInput,
TGSI_FILE_IMMEDIATE, pctx->numImmed, false);
/* TEX texTemp, texTemp, sampler, 2D; */
tgsi_transform_tex_inst(ctx,
TGSI_FILE_TEMPORARY, texTemp,
TGSI_FILE_TEMPORARY, texTemp,
TGSI_TEXTURE_2D, sampIdx);
/* KILL_IF -texTemp; # if -texTemp < 0, kill fragment */
tgsi_transform_kill_inst(ctx,
TGSI_FILE_TEMPORARY, texTemp,
TGSI_SWIZZLE_W, TRUE);
}
/**
* Given a fragment shader, return a new fragment shader which
* samples a stipple texture and executes KILL.
*
* \param samplerUnitOut returns the index of the sampler unit which
* will be used to sample the stipple texture;
* if NULL, the fixed unit is used
* \param fixedUnit fixed texture unit used for the stipple texture
* \param wincoordFile TGSI_FILE_INPUT or TGSI_FILE_SYSTEM_VALUE,
* depending on which one is supported by the driver
* for TGSI_SEMANTIC_POSITION in the fragment shader
*/
struct tgsi_token *
util_pstipple_create_fragment_shader(const struct tgsi_token *tokens,
unsigned *samplerUnitOut,
unsigned fixedUnit,
unsigned wincoordFile)
{
struct pstip_transform_context transform;
const uint newLen = tgsi_num_tokens(tokens) + NUM_NEW_TOKENS;
struct tgsi_token *new_tokens;
/* Setup shader transformation info/context.
*/
memset(&transform, 0, sizeof(transform));
transform.wincoordInput = -1;
transform.wincoordFile = wincoordFile;
transform.maxInput = -1;
transform.coordOrigin = TGSI_FS_COORD_ORIGIN_UPPER_LEFT;
transform.hasFixedUnit = !samplerUnitOut;
transform.fixedUnit = fixedUnit;
transform.base.prolog = pstip_transform_prolog;
transform.base.transform_declaration = pstip_transform_decl;
transform.base.transform_immediate = pstip_transform_immed;
tgsi_scan_shader(tokens, &transform.info);
transform.coordOrigin =
transform.info.properties[TGSI_PROPERTY_FS_COORD_ORIGIN];
new_tokens = tgsi_transform_shader(tokens, newLen, &transform.base);
if (!new_tokens)
return NULL;
#if 0 /* DEBUG */
tgsi_dump(fs->tokens, 0);
tgsi_dump(new_fs->tokens, 0);
#endif
if (samplerUnitOut) {
assert(transform.freeSampler < PIPE_MAX_SAMPLERS);
*samplerUnitOut = transform.freeSampler;
}
return new_tokens;
}
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