229 lines
6.5 KiB
C
229 lines
6.5 KiB
C
/**************************************************************************
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*
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* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/* Authors: Keith Whitwell <keith@tungstengraphics.com>
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*/
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#include "pipe/p_context.h"
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#include "pipe/p_defines.h"
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#include "pipe/p_shader_tokens.h"
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#include "util/u_math.h"
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#include "util/u_memory.h"
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#include "draw_private.h"
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#include "draw_pipe.h"
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struct wideline_stage {
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struct draw_stage stage;
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float half_line_width;
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};
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static INLINE struct wideline_stage *wideline_stage( struct draw_stage *stage )
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{
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return (struct wideline_stage *)stage;
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}
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/**
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* Draw a wide line by drawing a quad (two triangles).
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*/
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static void wideline_line( struct draw_stage *stage,
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struct prim_header *header )
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{
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/*const struct wideline_stage *wide = wideline_stage(stage);*/
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const unsigned pos = draw_current_shader_position_output(stage->draw);
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const float half_width = 0.5f * stage->draw->rasterizer->line_width;
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struct prim_header tri;
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struct vertex_header *v0 = dup_vert(stage, header->v[0], 0);
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struct vertex_header *v1 = dup_vert(stage, header->v[0], 1);
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struct vertex_header *v2 = dup_vert(stage, header->v[1], 2);
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struct vertex_header *v3 = dup_vert(stage, header->v[1], 3);
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float *pos0 = v0->data[pos];
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float *pos1 = v1->data[pos];
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float *pos2 = v2->data[pos];
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float *pos3 = v3->data[pos];
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const float dx = fabsf(pos0[0] - pos2[0]);
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const float dy = fabsf(pos0[1] - pos2[1]);
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const boolean half_pixel_center =
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stage->draw->rasterizer->half_pixel_center;
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/* small tweak to meet GL specification */
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const float bias = half_pixel_center ? 0.125f : 0.0f;
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/*
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* Draw wide line as a quad (two tris) by "stretching" the line along
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* X or Y.
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* We need to tweak coords in several ways to be conformant here.
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*/
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if (dx > dy) {
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/* x-major line */
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pos0[1] = pos0[1] - half_width - bias;
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pos1[1] = pos1[1] + half_width - bias;
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pos2[1] = pos2[1] - half_width - bias;
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pos3[1] = pos3[1] + half_width - bias;
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if (half_pixel_center) {
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if (pos0[0] < pos2[0]) {
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/* left to right line */
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pos0[0] -= 0.5f;
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pos1[0] -= 0.5f;
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pos2[0] -= 0.5f;
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pos3[0] -= 0.5f;
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}
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else {
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/* right to left line */
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pos0[0] += 0.5f;
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pos1[0] += 0.5f;
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pos2[0] += 0.5f;
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pos3[0] += 0.5f;
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}
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}
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}
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else {
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/* y-major line */
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pos0[0] = pos0[0] - half_width + bias;
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pos1[0] = pos1[0] + half_width + bias;
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pos2[0] = pos2[0] - half_width + bias;
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pos3[0] = pos3[0] + half_width + bias;
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if (half_pixel_center) {
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if (pos0[1] < pos2[1]) {
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/* top to bottom line */
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pos0[1] -= 0.5f;
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pos1[1] -= 0.5f;
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pos2[1] -= 0.5f;
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pos3[1] -= 0.5f;
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}
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else {
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/* bottom to top line */
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pos0[1] += 0.5f;
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pos1[1] += 0.5f;
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pos2[1] += 0.5f;
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pos3[1] += 0.5f;
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}
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}
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}
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tri.det = header->det; /* only the sign matters */
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tri.v[0] = v0;
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tri.v[1] = v2;
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tri.v[2] = v3;
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stage->next->tri( stage->next, &tri );
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tri.v[0] = v0;
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tri.v[1] = v3;
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tri.v[2] = v1;
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stage->next->tri( stage->next, &tri );
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}
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static void wideline_first_line( struct draw_stage *stage,
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struct prim_header *header )
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{
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struct draw_context *draw = stage->draw;
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struct pipe_context *pipe = draw->pipe;
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const struct pipe_rasterizer_state *rast = draw->rasterizer;
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void *r;
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/* Disable triangle culling, stippling, unfilled mode etc. */
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r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade);
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draw->suspend_flushing = TRUE;
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pipe->bind_rasterizer_state(pipe, r);
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draw->suspend_flushing = FALSE;
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stage->line = wideline_line;
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wideline_line(stage, header);
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}
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static void wideline_flush( struct draw_stage *stage, unsigned flags )
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{
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struct draw_context *draw = stage->draw;
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struct pipe_context *pipe = draw->pipe;
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stage->line = wideline_first_line;
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stage->next->flush( stage->next, flags );
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/* restore original rasterizer state */
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if (draw->rast_handle) {
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draw->suspend_flushing = TRUE;
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pipe->bind_rasterizer_state(pipe, draw->rast_handle);
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draw->suspend_flushing = FALSE;
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}
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}
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static void wideline_reset_stipple_counter( struct draw_stage *stage )
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{
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stage->next->reset_stipple_counter( stage->next );
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}
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static void wideline_destroy( struct draw_stage *stage )
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{
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draw_free_temp_verts( stage );
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FREE( stage );
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}
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struct draw_stage *draw_wide_line_stage( struct draw_context *draw )
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{
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struct wideline_stage *wide = CALLOC_STRUCT(wideline_stage);
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if (wide == NULL)
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goto fail;
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wide->stage.draw = draw;
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wide->stage.name = "wide-line";
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wide->stage.next = NULL;
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wide->stage.point = draw_pipe_passthrough_point;
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wide->stage.line = wideline_first_line;
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wide->stage.tri = draw_pipe_passthrough_tri;
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wide->stage.flush = wideline_flush;
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wide->stage.reset_stipple_counter = wideline_reset_stipple_counter;
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wide->stage.destroy = wideline_destroy;
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if (!draw_alloc_temp_verts( &wide->stage, 4 ))
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goto fail;
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return &wide->stage;
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fail:
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if (wide)
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wide->stage.destroy( &wide->stage );
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return NULL;
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}
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