/**************************************************************************
*
* Copyright 2007 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.
*
**************************************************************************/
/**
* AA line stage: AA lines are converted to texture mapped triangles.
*
* 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_math.h"
#include "util/u_memory.h"
#include "util/u_sampler.h"
#include "tgsi/tgsi_transform.h"
#include "tgsi/tgsi_dump.h"
#include "draw_context.h"
#include "draw_private.h"
#include "draw_pipe.h"
/** Approx number of new tokens for instructions in aa_transform_inst() */
#define NUM_NEW_TOKENS 50
/**
* Size for the alpha texture used for antialiasing
*/
#define TEXTURE_SIZE_LOG2 5 /* 32 x 32 */
/**
* Max texture level for the alpha texture used for antialiasing
*
* Don't use the 1x1 and 2x2 mipmap levels.
*/
#define MAX_TEXTURE_LEVEL (TEXTURE_SIZE_LOG2 - 2)
/**
* Subclass of pipe_shader_state to carry extra fragment shader info.
*/
struct aaline_fragment_shader
{
struct pipe_shader_state state;
void *driver_fs;
void *aaline_fs;
uint sampler_unit;
int generic_attrib; /**< texcoord/generic used for texture */
};
/**
* Subclass of draw_stage
*/
struct aaline_stage
{
struct draw_stage stage;
float half_line_width;
/** For AA lines, this is the vertex attrib slot for the new texcoords */
uint tex_slot;
/** position, not necessarily output zero */
uint pos_slot;
void *sampler_cso;
struct pipe_resource *texture;
struct pipe_sampler_view *sampler_view;
uint num_samplers;
uint num_sampler_views;
/*
* Currently bound state
*/
struct aaline_fragment_shader *fs;
struct {
void *sampler[PIPE_MAX_SAMPLERS];
struct pipe_sampler_view *sampler_views[PIPE_MAX_SHADER_SAMPLER_VIEWS];
} state;
/*
* Driver interface/override functions
*/
void * (*driver_create_fs_state)(struct pipe_context *,
const struct pipe_shader_state *);
void (*driver_bind_fs_state)(struct pipe_context *, void *);
void (*driver_delete_fs_state)(struct pipe_context *, void *);
void (*driver_bind_sampler_states)(struct pipe_context *, unsigned, unsigned,
unsigned, void **);
void (*driver_set_sampler_views)(struct pipe_context *, unsigned shader,
unsigned start, unsigned count,
struct pipe_sampler_view **);
};
/**
* Subclass of tgsi_transform_context, used for transforming the
* user's fragment shader to add the special AA instructions.
*/
struct aa_transform_context {
struct tgsi_transform_context base;
uint tempsUsed; /**< bitmask */
int colorOutput; /**< which output is the primary color */
uint samplersUsed; /**< bitfield of samplers used */
int freeSampler; /** an available sampler for the pstipple */
int maxInput, maxGeneric; /**< max input index found */
int colorTemp, texTemp; /**< temp registers */
};
/**
* TGSI declaration transform callback.
* Look for a free sampler, a free input attrib, and two free temp regs.
*/
static void
aa_transform_decl(struct tgsi_transform_context *ctx,
struct tgsi_full_declaration *decl)
{
struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
decl->Semantic.Index == 0) {
aactx->colorOutput = decl->Range.First;
}
else if (decl->Declaration.File == TGSI_FILE_SAMPLER) {
uint i;
for (i = decl->Range.First;
i <= decl->Range.Last; i++) {
aactx->samplersUsed |= 1 << i;
}
}
else if (decl->Declaration.File == TGSI_FILE_INPUT) {
if ((int) decl->Range.Last > aactx->maxInput)
aactx->maxInput = decl->Range.Last;
if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
(int) decl->Semantic.Index > aactx->maxGeneric) {
aactx->maxGeneric = decl->Semantic.Index;
}
}
else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
uint i;
for (i = decl->Range.First;
i <= decl->Range.Last; i++) {
aactx->tempsUsed |= (1 << i);
}
}
ctx->emit_declaration(ctx, decl);
}
/**
* 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 callback.
*/
static void
aa_transform_prolog(struct tgsi_transform_context *ctx)
{
struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
uint i;
/* find free sampler */
aactx->freeSampler = free_bit(aactx->samplersUsed);
if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
/* find two free temp regs */
for (i = 0; i < 32; i++) {
if ((aactx->tempsUsed & (1 << i)) == 0) {
/* found a free temp */
if (aactx->colorTemp < 0)
aactx->colorTemp = i;
else if (aactx->texTemp < 0)
aactx->texTemp = i;
else
break;
}
}
assert(aactx
->colorTemp
>= 0);
/* declare new generic input/texcoord */
tgsi_transform_input_decl(ctx, aactx->maxInput + 1,
TGSI_SEMANTIC_GENERIC, aactx->maxGeneric + 1,
TGSI_INTERPOLATE_LINEAR);
/* declare new sampler */
tgsi_transform_sampler_decl(ctx, aactx->freeSampler);
/* declare new temp regs */
tgsi_transform_temp_decl(ctx, aactx->texTemp);
tgsi_transform_temp_decl(ctx, aactx->colorTemp);
}
/**
* TGSI transform epilog callback.
*/
static void
aa_transform_epilog(struct tgsi_transform_context *ctx)
{
struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
if (aactx->colorOutput != -1) {
/* insert texture sampling code for antialiasing. */
/* TEX texTemp, input_coord, sampler */
tgsi_transform_tex_2d_inst(ctx,
TGSI_FILE_TEMPORARY, aactx->texTemp,
TGSI_FILE_INPUT, aactx->maxInput + 1,
aactx->freeSampler);
/* MOV rgb */
tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
TGSI_FILE_OUTPUT, aactx->colorOutput,
TGSI_WRITEMASK_XYZ,
TGSI_FILE_TEMPORARY, aactx->colorTemp);
/* MUL alpha */
tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL,
TGSI_FILE_OUTPUT, aactx->colorOutput,
TGSI_WRITEMASK_W,
TGSI_FILE_TEMPORARY, aactx->colorTemp,
TGSI_FILE_TEMPORARY, aactx->texTemp);
}
}
/**
* TGSI instruction transform callback.
* Replace writes to result.color w/ a temp reg.
*/
static void
aa_transform_inst(struct tgsi_transform_context *ctx,
struct tgsi_full_instruction *inst)
{
struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
uint i;
/*
* Look for writes to result.color and replace with colorTemp 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 == aactx->colorOutput) {
dst->Register.File = TGSI_FILE_TEMPORARY;
dst->Register.Index = aactx->colorTemp;
}
}
ctx->emit_instruction(ctx, inst);
}
/**
* Generate the frag shader we'll use for drawing AA lines.
* This will be the user's shader plus some texture/modulate instructions.
*/
static boolean
generate_aaline_fs(struct aaline_stage *aaline)
{
struct pipe_context *pipe = aaline->stage.draw->pipe;
const struct pipe_shader_state *orig_fs = &aaline->fs->state;
struct pipe_shader_state aaline_fs;
struct aa_transform_context transform;
const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
aaline_fs = *orig_fs; /* copy to init */
aaline_fs.tokens = tgsi_alloc_tokens(newLen);
if (aaline_fs.tokens == NULL)
return FALSE;
memset(&transform
, 0, sizeof(transform
)); transform.colorOutput = -1;
transform.maxInput = -1;
transform.maxGeneric = -1;
transform.colorTemp = -1;
transform.texTemp = -1;
transform.base.prolog = aa_transform_prolog;
transform.base.epilog = aa_transform_epilog;
transform.base.transform_instruction = aa_transform_inst;
transform.base.transform_declaration = aa_transform_decl;
tgsi_transform_shader(orig_fs->tokens,
(struct tgsi_token *) aaline_fs.tokens,
newLen, &transform.base);
#if 0 /* DEBUG */
debug_printf("draw_aaline, orig shader:\n");
tgsi_dump(orig_fs->tokens, 0);
debug_printf("draw_aaline, new shader:\n");
tgsi_dump(aaline_fs.tokens, 0);
#endif
aaline->fs->sampler_unit = transform.freeSampler;
aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
if (aaline->fs->aaline_fs == NULL)
goto fail;
aaline->fs->generic_attrib = transform.maxGeneric + 1;
FREE((void *)aaline_fs.tokens);
return TRUE;
fail:
FREE((void *)aaline_fs.tokens);
return FALSE;
}
/**
* Create the texture map we'll use for antialiasing the lines.
*/
static boolean
aaline_create_texture(struct aaline_stage *aaline)
{
struct pipe_context *pipe = aaline->stage.draw->pipe;
struct pipe_screen *screen = pipe->screen;
struct pipe_resource texTemp;
struct pipe_sampler_view viewTempl;
uint level;
memset(&texTemp
, 0, sizeof(texTemp
)); texTemp.target = PIPE_TEXTURE_2D;
texTemp.format = PIPE_FORMAT_A8_UNORM; /* XXX verify supported by driver! */
texTemp.last_level = MAX_TEXTURE_LEVEL;
texTemp.width0 = 1 << TEXTURE_SIZE_LOG2;
texTemp.height0 = 1 << TEXTURE_SIZE_LOG2;
texTemp.depth0 = 1;
texTemp.array_size = 1;
texTemp.bind = PIPE_BIND_SAMPLER_VIEW;
aaline->texture = screen->resource_create(screen, &texTemp);
if (!aaline->texture)
return FALSE;
u_sampler_view_default_template(&viewTempl,
aaline->texture,
aaline->texture->format);
aaline->sampler_view = pipe->create_sampler_view(pipe,
aaline->texture,
&viewTempl);
if (!aaline->sampler_view) {
return FALSE;
}
/* Fill in mipmap images.
* Basically each level is solid opaque, except for the outermost
* texels which are zero. Special case the 1x1 and 2x2 levels
* (though, those levels shouldn't be used - see the max_lod setting).
*/
for (level = 0; level <= MAX_TEXTURE_LEVEL; level++) {
struct pipe_transfer *transfer;
struct pipe_box box;
const uint size = u_minify(aaline->texture->width0, level);
ubyte *data;
uint i, j;
assert(aaline
->texture
->width0
== aaline
->texture
->height0
);
u_box_origin_2d( size, size, &box );
/* This texture is new, no need to flush.
*/
data = pipe->transfer_map(pipe,
aaline->texture,
level,
PIPE_TRANSFER_WRITE,
&box, &transfer);
if (data == NULL)
return FALSE;
for (i = 0; i < size; i++) {
for (j = 0; j < size; j++) {
ubyte d;
if (size == 1) {
d = 255;
}
else if (size == 2) {
d = 200; /* tuneable */
}
else if (i == 0 || j == 0 || i == size - 1 || j == size - 1) {
d = 35; /* edge texel */
}
else {
d = 255;
}
data[i * transfer->stride + j] = d;
}
}
/* unmap */
pipe->transfer_unmap(pipe, transfer);
}
return TRUE;
}
/**
* Create the sampler CSO that'll be used for antialiasing.
* By using a mipmapped texture, we don't have to generate a different
* texture image for each line size.
*/
static boolean
aaline_create_sampler(struct aaline_stage *aaline)
{
struct pipe_sampler_state sampler;
struct pipe_context *pipe = aaline->stage.draw->pipe;
memset(&sampler
, 0, sizeof(sampler
)); sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
sampler.min_mip_filter = PIPE_TEX_MIPFILTER_LINEAR;
sampler.min_img_filter = PIPE_TEX_FILTER_LINEAR;
sampler.mag_img_filter = PIPE_TEX_FILTER_LINEAR;
sampler.normalized_coords = 1;
sampler.min_lod = 0.0f;
sampler.max_lod = MAX_TEXTURE_LEVEL;
aaline->sampler_cso = pipe->create_sampler_state(pipe, &sampler);
if (aaline->sampler_cso == NULL)
return FALSE;
return TRUE;
}
/**
* When we're about to draw our first AA line in a batch, this function is
* called to tell the driver to bind our modified fragment shader.
*/
static boolean
bind_aaline_fragment_shader(struct aaline_stage *aaline)
{
struct draw_context *draw = aaline->stage.draw;
struct pipe_context *pipe = draw->pipe;
if (!aaline->fs->aaline_fs &&
!generate_aaline_fs(aaline))
return FALSE;
draw->suspend_flushing = TRUE;
aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
draw->suspend_flushing = FALSE;
return TRUE;
}
static INLINE struct aaline_stage *
aaline_stage( struct draw_stage *stage )
{
return (struct aaline_stage *) stage;
}
/**
* Draw a wide line by drawing a quad, using geometry which will
* fullfill GL's antialiased line requirements.
*/
static void
aaline_line(struct draw_stage *stage, struct prim_header *header)
{
const struct aaline_stage *aaline = aaline_stage(stage);
const float half_width = aaline->half_line_width;
struct prim_header tri;
struct vertex_header *v[8];
uint texPos = aaline->tex_slot;
uint posPos = aaline->pos_slot;
float *pos, *tex;
float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
double a
= atan2(dy
, dx
); float c_a
= (float) cos(a
), s_a
= (float) sin(a
); uint i;
/* XXX the ends of lines aren't quite perfect yet, but probably passable */
dx = 0.5F * half_width;
dy = half_width;
/* allocate/dup new verts */
for (i = 0; i < 8; i++) {
v[i] = dup_vert(stage, header->v[i/4], i);
}
/*
* Quad strip for line from v0 to v1 (*=endpoints):
*
* 1 3 5 7
* +---+---------------------+---+
* | |
* | *v0 v1* |
* | |
* +---+---------------------+---+
* 0 2 4 6
*/
/* new verts */
pos = v[0]->data[posPos];
pos[0] += (-dx * c_a - dy * s_a);
pos[1] += (-dx * s_a + dy * c_a);
pos = v[1]->data[posPos];
pos[0] += (-dx * c_a - -dy * s_a);
pos[1] += (-dx * s_a + -dy * c_a);
pos = v[2]->data[posPos];
pos[0] += ( dx * c_a - dy * s_a);
pos[1] += ( dx * s_a + dy * c_a);
pos = v[3]->data[posPos];
pos[0] += ( dx * c_a - -dy * s_a);
pos[1] += ( dx * s_a + -dy * c_a);
pos = v[4]->data[posPos];
pos[0] += (-dx * c_a - dy * s_a);
pos[1] += (-dx * s_a + dy * c_a);
pos = v[5]->data[posPos];
pos[0] += (-dx * c_a - -dy * s_a);
pos[1] += (-dx * s_a + -dy * c_a);
pos = v[6]->data[posPos];
pos[0] += ( dx * c_a - dy * s_a);
pos[1] += ( dx * s_a + dy * c_a);
pos = v[7]->data[posPos];
pos[0] += ( dx * c_a - -dy * s_a);
pos[1] += ( dx * s_a + -dy * c_a);
/* new texcoords */
tex = v[0]->data[texPos];
ASSIGN_4V(tex, 0, 0, 0, 1);
tex = v[1]->data[texPos];
ASSIGN_4V(tex, 0, 1, 0, 1);
tex = v[2]->data[texPos];
ASSIGN_4V(tex, .5, 0, 0, 1);
tex = v[3]->data[texPos];
ASSIGN_4V(tex, .5, 1, 0, 1);
tex = v[4]->data[texPos];
ASSIGN_4V(tex, .5, 0, 0, 1);
tex = v[5]->data[texPos];
ASSIGN_4V(tex, .5, 1, 0, 1);
tex = v[6]->data[texPos];
ASSIGN_4V(tex, 1, 0, 0, 1);
tex = v[7]->data[texPos];
ASSIGN_4V(tex, 1, 1, 0, 1);
/* emit 6 tris for the quad strip */
tri.v[0] = v[2]; tri.v[1] = v[1]; tri.v[2] = v[0];
stage->next->tri( stage->next, &tri );
tri.v[0] = v[3]; tri.v[1] = v[1]; tri.v[2] = v[2];
stage->next->tri( stage->next, &tri );
tri.v[0] = v[4]; tri.v[1] = v[3]; tri.v[2] = v[2];
stage->next->tri( stage->next, &tri );
tri.v[0] = v[5]; tri.v[1] = v[3]; tri.v[2] = v[4];
stage->next->tri( stage->next, &tri );
tri.v[0] = v[6]; tri.v[1] = v[5]; tri.v[2] = v[4];
stage->next->tri( stage->next, &tri );
tri.v[0] = v[7]; tri.v[1] = v[5]; tri.v[2] = v[6];
stage->next->tri( stage->next, &tri );
}
static void
aaline_first_line(struct draw_stage *stage, struct prim_header *header)
{
auto struct aaline_stage *aaline = aaline_stage(stage);
struct draw_context *draw = stage->draw;
struct pipe_context *pipe = draw->pipe;
const struct pipe_rasterizer_state *rast = draw->rasterizer;
uint num_samplers;
void *r;
assert(draw
->rasterizer
->line_smooth
);
if (draw->rasterizer->line_width <= 2.2)
aaline->half_line_width = 1.1f;
else
aaline->half_line_width = 0.5f * draw->rasterizer->line_width;
/*
* Bind (generate) our fragprog, sampler and texture
*/
if (!bind_aaline_fragment_shader(aaline)) {
stage->line = draw_pipe_passthrough_line;
stage->line(stage, header);
return;
}
draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
/* how many samplers? */
/* we'll use sampler/texture[pstip->sampler_unit] for the stipple */
num_samplers = MAX2(aaline->num_sampler_views, aaline->num_samplers);
num_samplers = MAX2(num_samplers, aaline->fs->sampler_unit + 1);
aaline->state.sampler[aaline->fs->sampler_unit] = aaline->sampler_cso;
pipe_sampler_view_reference(&aaline->state.sampler_views[aaline->fs->sampler_unit],
aaline->sampler_view);
draw->suspend_flushing = TRUE;
aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
num_samplers, aaline->state.sampler);
aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
num_samplers, aaline->state.sampler_views);
/* Disable triangle culling, stippling, unfilled mode etc. */
r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
pipe->bind_rasterizer_state(pipe, r);
draw->suspend_flushing = FALSE;
/* now really draw first line */
stage->line = aaline_line;
stage->line(stage, header);
}
static void
aaline_flush(struct draw_stage *stage, unsigned flags)
{
struct draw_context *draw = stage->draw;
struct aaline_stage *aaline = aaline_stage(stage);
struct pipe_context *pipe = draw->pipe;
stage->line = aaline_first_line;
stage->next->flush( stage->next, flags );
/* restore original frag shader, texture, sampler state */
draw->suspend_flushing = TRUE;
aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
aaline->driver_bind_sampler_states(pipe, PIPE_SHADER_FRAGMENT, 0,
aaline->num_samplers,
aaline->state.sampler);
aaline->driver_set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0,
aaline->num_samplers,
aaline->state.sampler_views);
/* restore original rasterizer state */
if (draw->rast_handle) {
pipe->bind_rasterizer_state(pipe, draw->rast_handle);
}
draw->suspend_flushing = FALSE;
draw_remove_extra_vertex_attribs(draw);
}
static void
aaline_reset_stipple_counter(struct draw_stage *stage)
{
stage->next->reset_stipple_counter( stage->next );
}
static void
aaline_destroy(struct draw_stage *stage)
{
struct aaline_stage *aaline = aaline_stage(stage);
struct pipe_context *pipe = stage->draw->pipe;
uint i;
for (i = 0; i < PIPE_MAX_SHADER_SAMPLER_VIEWS; i++) {
pipe_sampler_view_reference(&aaline->state.sampler_views[i], NULL);
}
if (aaline->sampler_cso)
pipe->delete_sampler_state(pipe, aaline->sampler_cso);
if (aaline->texture)
pipe_resource_reference(&aaline->texture, NULL);
if (aaline->sampler_view) {
pipe_sampler_view_reference(&aaline->sampler_view, NULL);
}
draw_free_temp_verts( stage );
/* restore the old entry points */
pipe->create_fs_state = aaline->driver_create_fs_state;
pipe->bind_fs_state = aaline->driver_bind_fs_state;
pipe->delete_fs_state = aaline->driver_delete_fs_state;
pipe->bind_sampler_states = aaline->driver_bind_sampler_states;
pipe->set_sampler_views = aaline->driver_set_sampler_views;
FREE( stage );
}
static struct aaline_stage *
draw_aaline_stage(struct draw_context *draw)
{
struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
if (aaline == NULL)
return NULL;
aaline->stage.draw = draw;
aaline->stage.name = "aaline";
aaline->stage.next = NULL;
aaline->stage.point = draw_pipe_passthrough_point;
aaline->stage.line = aaline_first_line;
aaline->stage.tri = draw_pipe_passthrough_tri;
aaline->stage.flush = aaline_flush;
aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
aaline->stage.destroy = aaline_destroy;
if (!draw_alloc_temp_verts( &aaline->stage, 8 ))
goto fail;
return aaline;
fail:
if (aaline)
aaline->stage.destroy(&aaline->stage);
return NULL;
}
static struct aaline_stage *
aaline_stage_from_pipe(struct pipe_context *pipe)
{
struct draw_context *draw = (struct draw_context *) pipe->draw;
if (draw) {
return aaline_stage(draw->pipeline.aaline);
} else {
return NULL;
}
}
/**
* This function overrides the driver's create_fs_state() function and
* will typically be called by the state tracker.
*/
static void *
aaline_create_fs_state(struct pipe_context *pipe,
const struct pipe_shader_state *fs)
{
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
struct aaline_fragment_shader *aafs = NULL;
if (aaline == NULL)
return NULL;
aafs = CALLOC_STRUCT(aaline_fragment_shader);
if (aafs == NULL)
return NULL;
aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
/* pass-through */
aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
return aafs;
}
static void
aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
{
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
if (aaline == NULL) {
return;
}
/* save current */
aaline->fs = aafs;
/* pass-through */
aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
}
static void
aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
{
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
if (aafs == NULL) {
return;
}
if (aaline != NULL) {
/* pass-through */
aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
if (aafs->aaline_fs)
aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
}
FREE((void*)aafs->state.tokens);
FREE(aafs);
}
static void
aaline_bind_sampler_states(struct pipe_context *pipe, unsigned shader,
unsigned start, unsigned num, void **sampler)
{
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
if (aaline == NULL) {
return;
}
if (shader == PIPE_SHADER_FRAGMENT) {
/* save current */
memcpy(aaline
->state.
sampler, sampler
, num
* sizeof(void *)); aaline->num_samplers = num;
}
/* pass-through */
aaline->driver_bind_sampler_states(pipe, shader, start, num, sampler);
}
static void
aaline_set_sampler_views(struct pipe_context *pipe, unsigned shader,
unsigned start, unsigned num,
struct pipe_sampler_view **views)
{
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
uint i;
if (aaline == NULL) {
return;
}
if (shader == PIPE_SHADER_FRAGMENT) {
/* save current */
for (i = 0; i < num; i++) {
pipe_sampler_view_reference(&aaline->state.sampler_views[start + i],
views[i]);
}
aaline->num_sampler_views = num;
}
/* pass-through */
aaline->driver_set_sampler_views(pipe, shader, start, num, views);
}
void
draw_aaline_prepare_outputs(struct draw_context *draw,
struct draw_stage *stage)
{
struct aaline_stage *aaline = aaline_stage(stage);
const struct pipe_rasterizer_state *rast = draw->rasterizer;
/* update vertex attrib info */
aaline->pos_slot = draw_current_shader_position_output(draw);;
if (!rast->line_smooth)
return;
/* allocate the extra post-transformed vertex attribute */
aaline->tex_slot = draw_alloc_extra_vertex_attrib(draw,
TGSI_SEMANTIC_GENERIC,
aaline->fs->generic_attrib);
}
/**
* Called by drivers that want to install this AA line prim stage
* into the draw module's pipeline. This will not be used if the
* hardware has native support for AA lines.
*/
boolean
draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
{
struct aaline_stage *aaline;
pipe->draw = (void *) draw;
/*
* Create / install AA line drawing / prim stage
*/
aaline = draw_aaline_stage( draw );
if (!aaline)
goto fail;
/* save original driver functions */
aaline->driver_create_fs_state = pipe->create_fs_state;
aaline->driver_bind_fs_state = pipe->bind_fs_state;
aaline->driver_delete_fs_state = pipe->delete_fs_state;
aaline->driver_bind_sampler_states = pipe->bind_sampler_states;
aaline->driver_set_sampler_views = pipe->set_sampler_views;
/* create special texture, sampler state */
if (!aaline_create_texture(aaline))
goto fail;
if (!aaline_create_sampler(aaline))
goto fail;
/* override the driver's functions */
pipe->create_fs_state = aaline_create_fs_state;
pipe->bind_fs_state = aaline_bind_fs_state;
pipe->delete_fs_state = aaline_delete_fs_state;
pipe->bind_sampler_states = aaline_bind_sampler_states;
pipe->set_sampler_views = aaline_set_sampler_views;
/* Install once everything is known to be OK:
*/
draw->pipeline.aaline = &aaline->stage;
return TRUE;
fail:
if (aaline)
aaline->stage.destroy( &aaline->stage );
return FALSE;
}