+++ /dev/null
-/**************************************************************************
- *
- * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
- * 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.
- *
- **************************************************************************/
-
-/* Authors: Keith Whitwell <keith@tungstengraphics.com>
- */
-
-#include "pipe/p_util.h"
-#include "pipe/p_defines.h"
-#include "pipe/p_shader_tokens.h"
-#include "draw_private.h"
-
-
-struct wide_stage {
- struct draw_stage stage;
-
- float half_line_width;
- float half_point_size;
-
- uint texcoord_slot[PIPE_MAX_SHADER_OUTPUTS];
- uint texcoord_mode[PIPE_MAX_SHADER_OUTPUTS];
- uint num_texcoords;
-
- int psize_slot;
-};
-
-
-
-static INLINE struct wide_stage *wide_stage( struct draw_stage *stage )
-{
- return (struct wide_stage *)stage;
-}
-
-
-static void passthrough_point( struct draw_stage *stage,
- struct prim_header *header )
-{
- stage->next->point( stage->next, header );
-}
-
-static void passthrough_line( struct draw_stage *stage,
- struct prim_header *header )
-{
- stage->next->line(stage->next, header);
-}
-
-static void passthrough_tri( struct draw_stage *stage,
- struct prim_header *header )
-{
- stage->next->tri(stage->next, header);
-}
-
-
-/**
- * Draw a wide line by drawing a quad (two triangles).
- * XXX need to disable polygon stipple.
- */
-static void wide_line( struct draw_stage *stage,
- struct prim_header *header )
-{
- const struct wide_stage *wide = wide_stage(stage);
- const float half_width = wide->half_line_width;
-
- struct prim_header tri;
-
- struct vertex_header *v0 = dup_vert(stage, header->v[0], 0);
- struct vertex_header *v1 = dup_vert(stage, header->v[0], 1);
- struct vertex_header *v2 = dup_vert(stage, header->v[1], 2);
- struct vertex_header *v3 = dup_vert(stage, header->v[1], 3);
-
- float *pos0 = v0->data[0];
- float *pos1 = v1->data[0];
- float *pos2 = v2->data[0];
- float *pos3 = v3->data[0];
-
- const float dx = FABSF(pos0[0] - pos2[0]);
- const float dy = FABSF(pos0[1] - pos2[1]);
-
- /*
- * Draw wide line as a quad (two tris) by "stretching" the line along
- * X or Y.
- * We need to tweak coords in several ways to be conformant here.
- */
-
- if (dx > dy) {
- /* x-major line */
- pos0[1] = pos0[1] - half_width - 0.25f;
- pos1[1] = pos1[1] + half_width - 0.25f;
- pos2[1] = pos2[1] - half_width - 0.25f;
- pos3[1] = pos3[1] + half_width - 0.25f;
- if (pos0[0] < pos2[0]) {
- /* left to right line */
- pos0[0] -= 0.5f;
- pos1[0] -= 0.5f;
- pos2[0] -= 0.5f;
- pos3[0] -= 0.5f;
- }
- else {
- /* right to left line */
- pos0[0] += 0.5f;
- pos1[0] += 0.5f;
- pos2[0] += 0.5f;
- pos3[0] += 0.5f;
- }
- }
- else {
- /* y-major line */
- pos0[0] = pos0[0] - half_width + 0.25f;
- pos1[0] = pos1[0] + half_width + 0.25f;
- pos2[0] = pos2[0] - half_width + 0.25f;
- pos3[0] = pos3[0] + half_width + 0.25f;
- if (pos0[1] < pos2[1]) {
- /* top to bottom line */
- pos0[1] -= 0.5f;
- pos1[1] -= 0.5f;
- pos2[1] -= 0.5f;
- pos3[1] -= 0.5f;
- }
- else {
- /* bottom to top line */
- pos0[1] += 0.5f;
- pos1[1] += 0.5f;
- pos2[1] += 0.5f;
- pos3[1] += 0.5f;
- }
- }
-
- tri.det = header->det; /* only the sign matters */
- tri.v[0] = v0;
- tri.v[1] = v2;
- tri.v[2] = v3;
- stage->next->tri( stage->next, &tri );
-
- tri.v[0] = v0;
- tri.v[1] = v3;
- tri.v[2] = v1;
- stage->next->tri( stage->next, &tri );
-}
-
-
-/**
- * Set the vertex texcoords for sprite mode.
- * Coords may be left untouched or set to a right-side-up or upside-down
- * orientation.
- */
-static void set_texcoords(const struct wide_stage *wide,
- struct vertex_header *v, const float tc[4])
-{
- uint i;
- for (i = 0; i < wide->num_texcoords; i++) {
- if (wide->texcoord_mode[i] != PIPE_SPRITE_COORD_NONE) {
- uint j = wide->texcoord_slot[i];
- v->data[j][0] = tc[0];
- if (wide->texcoord_mode[i] == PIPE_SPRITE_COORD_LOWER_LEFT)
- v->data[j][1] = 1.0f - tc[1];
- else
- v->data[j][1] = tc[1];
- v->data[j][2] = tc[2];
- v->data[j][3] = tc[3];
- }
- }
-}
-
-
-/* If there are lots of sprite points (and why wouldn't there be?) it
- * would probably be more sensible to change hardware setup to
- * optimize this rather than doing the whole thing in software like
- * this.
- */
-static void wide_point( struct draw_stage *stage,
- struct prim_header *header )
-{
- const struct wide_stage *wide = wide_stage(stage);
- const boolean sprite = (boolean) stage->draw->rasterizer->point_sprite;
- float half_size;
- float left_adj, right_adj;
-
- struct prim_header tri;
-
- /* four dups of original vertex */
- struct vertex_header *v0 = dup_vert(stage, header->v[0], 0);
- struct vertex_header *v1 = dup_vert(stage, header->v[0], 1);
- struct vertex_header *v2 = dup_vert(stage, header->v[0], 2);
- struct vertex_header *v3 = dup_vert(stage, header->v[0], 3);
-
- float *pos0 = v0->data[0];
- float *pos1 = v1->data[0];
- float *pos2 = v2->data[0];
- float *pos3 = v3->data[0];
-
- /* point size is either per-vertex or fixed size */
- if (wide->psize_slot >= 0) {
- half_size = 0.5f * header->v[0]->data[wide->psize_slot][0];
- }
- else {
- half_size = wide->half_point_size;
- }
-
- left_adj = -half_size; /* + 0.25f;*/
- right_adj = half_size; /* + 0.25f;*/
-
- pos0[0] += left_adj;
- pos0[1] -= half_size;
-
- pos1[0] += left_adj;
- pos1[1] += half_size;
-
- pos2[0] += right_adj;
- pos2[1] -= half_size;
-
- pos3[0] += right_adj;
- pos3[1] += half_size;
-
- if (sprite) {
- static const float tex00[4] = { 0, 0, 0, 1 };
- static const float tex01[4] = { 0, 1, 0, 1 };
- static const float tex11[4] = { 1, 1, 0, 1 };
- static const float tex10[4] = { 1, 0, 0, 1 };
- set_texcoords( wide, v0, tex00 );
- set_texcoords( wide, v1, tex01 );
- set_texcoords( wide, v2, tex10 );
- set_texcoords( wide, v3, tex11 );
- }
-
- tri.det = header->det; /* only the sign matters */
- tri.v[0] = v0;
- tri.v[1] = v2;
- tri.v[2] = v3;
- stage->next->tri( stage->next, &tri );
-
- tri.v[0] = v0;
- tri.v[1] = v3;
- tri.v[2] = v1;
- stage->next->tri( stage->next, &tri );
-}
-
-
-static void wide_first_point( struct draw_stage *stage,
- struct prim_header *header )
-{
- struct wide_stage *wide = wide_stage(stage);
- struct draw_context *draw = stage->draw;
-
- wide->half_point_size = 0.5f * draw->rasterizer->point_size;
-
- /* XXX we won't know the real size if it's computed by the vertex shader! */
- if (draw->rasterizer->point_size > draw->wide_point_threshold) {
- stage->point = wide_point;
- }
- else {
- stage->point = passthrough_point;
- }
-
- if (draw->rasterizer->point_sprite) {
- /* find vertex shader texcoord outputs */
- const struct draw_vertex_shader *vs = draw->vertex_shader;
- uint i, j = 0;
- for (i = 0; i < vs->info.num_outputs; i++) {
- if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_GENERIC) {
- wide->texcoord_slot[j] = i;
- wide->texcoord_mode[j] = draw->rasterizer->sprite_coord_mode[j];
- j++;
- }
- }
- wide->num_texcoords = j;
- }
-
- wide->psize_slot = -1;
-
- if (draw->rasterizer->point_size_per_vertex) {
- /* find PSIZ vertex output */
- const struct draw_vertex_shader *vs = draw->vertex_shader;
- uint i;
- for (i = 0; i < vs->info.num_outputs; i++) {
- if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_PSIZE) {
- wide->psize_slot = i;
- break;
- }
- }
- }
-
- stage->point( stage, header );
-}
-
-
-
-static void wide_first_line( struct draw_stage *stage,
- struct prim_header *header )
-{
- struct wide_stage *wide = wide_stage(stage);
- struct draw_context *draw = stage->draw;
-
- wide->half_line_width = 0.5f * draw->rasterizer->line_width;
-
- if (draw->rasterizer->line_width != 1.0) {
- wide->stage.line = wide_line;
- }
- else {
- wide->stage.line = passthrough_line;
- }
-
- stage->line( stage, header );
-}
-
-
-static void wide_flush( struct draw_stage *stage, unsigned flags )
-{
- stage->line = wide_first_line;
- stage->point = wide_first_point;
- stage->next->flush( stage->next, flags );
-}
-
-
-static void wide_reset_stipple_counter( struct draw_stage *stage )
-{
- stage->next->reset_stipple_counter( stage->next );
-}
-
-
-static void wide_destroy( struct draw_stage *stage )
-{
- draw_free_temp_verts( stage );
- FREE( stage );
-}
-
-
-struct draw_stage *draw_wide_stage( struct draw_context *draw )
-{
- struct wide_stage *wide = CALLOC_STRUCT(wide_stage);
-
- draw_alloc_temp_verts( &wide->stage, 4 );
-
- wide->stage.draw = draw;
- wide->stage.next = NULL;
- wide->stage.point = wide_first_point;
- wide->stage.line = wide_first_line;
- wide->stage.tri = passthrough_tri;
- wide->stage.flush = wide_flush;
- wide->stage.reset_stipple_counter = wide_reset_stipple_counter;
- wide->stage.destroy = wide_destroy;
-
- return &wide->stage;
-}
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