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| /************************************************************************** |
| * |
| * 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_context.h" |
| #include "pipe/p_defines.h" |
| #include "pipe/p_shader_tokens.h" |
| #include "util/u_math.h" |
| #include "util/u_memory.h" |
| #include "draw_private.h" |
| #include "draw_pipe.h" |
| |
| |
| struct wideline_stage { |
| struct draw_stage stage; |
| |
| float half_line_width; |
| }; |
| |
| |
| |
| static INLINE struct wideline_stage *wideline_stage( struct draw_stage *stage ) |
| { |
| return (struct wideline_stage *)stage; |
| } |
| |
| |
| |
| /** |
| * Draw a wide line by drawing a quad (two triangles). |
| */ |
| static void wideline_line( struct draw_stage *stage, |
| struct prim_header *header ) |
| { |
| /*const struct wideline_stage *wide = wideline_stage(stage);*/ |
| const unsigned pos = draw_current_shader_position_output(stage->draw); |
| const float half_width = 0.5f * stage->draw->rasterizer->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[pos]; |
| float *pos1 = v1->data[pos]; |
| float *pos2 = v2->data[pos]; |
| float *pos3 = v3->data[pos]; |
| |
| const float dx = fabsf(pos0[0] - pos2[0]); |
| const float dy = fabsf(pos0[1] - pos2[1]); |
| |
| const boolean half_pixel_center = |
| stage->draw->rasterizer->half_pixel_center; |
| |
| /* small tweak to meet GL specification */ |
| const float bias = half_pixel_center ? 0.125f : 0.0f; |
| |
| /* |
| * 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 - bias; |
| pos1[1] = pos1[1] + half_width - bias; |
| pos2[1] = pos2[1] - half_width - bias; |
| pos3[1] = pos3[1] + half_width - bias; |
| if (half_pixel_center) { |
| 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 + bias; |
| pos1[0] = pos1[0] + half_width + bias; |
| pos2[0] = pos2[0] - half_width + bias; |
| pos3[0] = pos3[0] + half_width + bias; |
| if (half_pixel_center) { |
| 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 ); |
| } |
| |
| |
| static void wideline_first_line( struct draw_stage *stage, |
| struct prim_header *header ) |
| { |
| struct draw_context *draw = stage->draw; |
| struct pipe_context *pipe = draw->pipe; |
| const struct pipe_rasterizer_state *rast = draw->rasterizer; |
| void *r; |
| |
| /* Disable triangle culling, stippling, unfilled mode etc. */ |
| r = draw_get_rasterizer_no_cull(draw, rast->scissor, rast->flatshade); |
| draw->suspend_flushing = TRUE; |
| pipe->bind_rasterizer_state(pipe, r); |
| draw->suspend_flushing = FALSE; |
| |
| stage->line = wideline_line; |
| |
| wideline_line(stage, header); |
| } |
| |
| |
| static void wideline_flush( struct draw_stage *stage, unsigned flags ) |
| { |
| struct draw_context *draw = stage->draw; |
| struct pipe_context *pipe = draw->pipe; |
| |
| stage->line = wideline_first_line; |
| stage->next->flush( stage->next, flags ); |
| |
| /* restore original rasterizer state */ |
| if (draw->rast_handle) { |
| draw->suspend_flushing = TRUE; |
| pipe->bind_rasterizer_state(pipe, draw->rast_handle); |
| draw->suspend_flushing = FALSE; |
| } |
| } |
| |
| |
| static void wideline_reset_stipple_counter( struct draw_stage *stage ) |
| { |
| stage->next->reset_stipple_counter( stage->next ); |
| } |
| |
| |
| static void wideline_destroy( struct draw_stage *stage ) |
| { |
| draw_free_temp_verts( stage ); |
| FREE( stage ); |
| } |
| |
| |
| struct draw_stage *draw_wide_line_stage( struct draw_context *draw ) |
| { |
| struct wideline_stage *wide = CALLOC_STRUCT(wideline_stage); |
| if (wide == NULL) |
| goto fail; |
| |
| wide->stage.draw = draw; |
| wide->stage.name = "wide-line"; |
| wide->stage.next = NULL; |
| wide->stage.point = draw_pipe_passthrough_point; |
| wide->stage.line = wideline_first_line; |
| wide->stage.tri = draw_pipe_passthrough_tri; |
| wide->stage.flush = wideline_flush; |
| wide->stage.reset_stipple_counter = wideline_reset_stipple_counter; |
| wide->stage.destroy = wideline_destroy; |
| |
| if (!draw_alloc_temp_verts( &wide->stage, 4 )) |
| goto fail; |
| |
| return &wide->stage; |
| |
| fail: |
| if (wide) |
| wide->stage.destroy( &wide->stage ); |
| |
| return NULL; |
| } |