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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> |
| */ |
| |
| /** |
| * Notes on wide points and sprite mode: |
| * |
| * In wide point/sprite mode we effectively need to convert each incoming |
| * vertex into four outgoing vertices specifying the corners of a quad. |
| * Since we don't (yet) have geometry shaders, we have to handle this here |
| * in the draw module. |
| * |
| * For sprites, it also means that this is where we have to handle texcoords |
| * for the vertices of the quad. OpenGL's GL_COORD_REPLACE state specifies |
| * if/how enabled texcoords are automatically generated for sprites. We pass |
| * that info through gallium in the pipe_rasterizer_state::sprite_coord_mode |
| * array. |
| * |
| * Additionally, GLSL's gl_PointCoord fragment attribute has to be handled |
| * here as well. This is basically an additional texture/generic attribute |
| * that varies .x from 0 to 1 horizontally across the point and varies .y |
| * vertically from 0 to 1 down the sprite. |
| * |
| * With geometry shaders, the state tracker could create a GS to do |
| * most/all of this. |
| */ |
| |
| |
| #include "pipe/p_screen.h" |
| #include "pipe/p_context.h" |
| #include "util/u_math.h" |
| #include "util/u_memory.h" |
| #include "pipe/p_defines.h" |
| #include "pipe/p_shader_tokens.h" |
| #include "draw_fs.h" |
| #include "draw_vs.h" |
| #include "draw_pipe.h" |
| |
| |
| struct widepoint_stage { |
| struct draw_stage stage; /**< base class */ |
| |
| float half_point_size; |
| |
| float xbias; |
| float ybias; |
| |
| /** for automatic texcoord generation/replacement */ |
| uint num_texcoord_gen; |
| uint texcoord_gen_slot[PIPE_MAX_SHADER_OUTPUTS]; |
| |
| /* TGSI_SEMANTIC to which sprite_coord_enable applies */ |
| unsigned sprite_coord_semantic; |
| |
| int psize_slot; |
| }; |
| |
| |
| |
| static INLINE struct widepoint_stage * |
| widepoint_stage( struct draw_stage *stage ) |
| { |
| return (struct widepoint_stage *)stage; |
| } |
| |
| |
| /** |
| * 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 widepoint_stage *wide, |
| struct vertex_header *v, const float tc[4]) |
| { |
| const struct draw_context *draw = wide->stage.draw; |
| const struct pipe_rasterizer_state *rast = draw->rasterizer; |
| const uint texcoord_mode = rast->sprite_coord_mode; |
| uint i; |
| |
| for (i = 0; i < wide->num_texcoord_gen; i++) { |
| const uint slot = wide->texcoord_gen_slot[i]; |
| v->data[slot][0] = tc[0]; |
| if (texcoord_mode == PIPE_SPRITE_COORD_LOWER_LEFT) |
| v->data[slot][1] = 1.0f - tc[1]; |
| else |
| v->data[slot][1] = tc[1]; |
| v->data[slot][2] = tc[2]; |
| v->data[slot][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 widepoint_point( struct draw_stage *stage, |
| struct prim_header *header ) |
| { |
| const struct widepoint_stage *wide = widepoint_stage(stage); |
| const unsigned pos = draw_current_shader_position_output(stage->draw); |
| const boolean sprite = (boolean) stage->draw->rasterizer->point_quad_rasterization; |
| float half_size; |
| float left_adj, right_adj, bot_adj, top_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[pos]; |
| float *pos1 = v1->data[pos]; |
| float *pos2 = v2->data[pos]; |
| float *pos3 = v3->data[pos]; |
| |
| /* point size is either per-vertex or fixed size */ |
| if (wide->psize_slot >= 0) { |
| half_size = header->v[0]->data[wide->psize_slot][0]; |
| half_size *= 0.5f; |
| } |
| else { |
| half_size = wide->half_point_size; |
| } |
| |
| left_adj = -half_size + wide->xbias; |
| right_adj = half_size + wide->xbias; |
| bot_adj = half_size + wide->ybias; |
| top_adj = -half_size + wide->ybias; |
| |
| pos0[0] += left_adj; |
| pos0[1] += top_adj; |
| |
| pos1[0] += left_adj; |
| pos1[1] += bot_adj; |
| |
| pos2[0] += right_adj; |
| pos2[1] += top_adj; |
| |
| pos3[0] += right_adj; |
| pos3[1] += bot_adj; |
| |
| 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 |
| widepoint_first_point(struct draw_stage *stage, |
| struct prim_header *header) |
| { |
| struct widepoint_stage *wide = widepoint_stage(stage); |
| struct draw_context *draw = stage->draw; |
| struct pipe_context *pipe = draw->pipe; |
| const struct pipe_rasterizer_state *rast = draw->rasterizer; |
| void *r; |
| |
| wide->half_point_size = 0.5f * rast->point_size; |
| wide->xbias = 0.0; |
| wide->ybias = 0.0; |
| |
| if (rast->half_pixel_center) { |
| wide->xbias = 0.125; |
| wide->ybias = -0.125; |
| } |
| |
| /* 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; |
| |
| /* XXX we won't know the real size if it's computed by the vertex shader! */ |
| if ((rast->point_size > draw->pipeline.wide_point_threshold) || |
| (rast->point_quad_rasterization && draw->pipeline.point_sprite)) { |
| stage->point = widepoint_point; |
| } |
| else { |
| stage->point = draw_pipe_passthrough_point; |
| } |
| |
| draw_remove_extra_vertex_attribs(draw); |
| |
| if (rast->point_quad_rasterization) { |
| const struct draw_fragment_shader *fs = draw->fs.fragment_shader; |
| uint i; |
| |
| assert(fs); |
| |
| wide->num_texcoord_gen = 0; |
| |
| /* Loop over fragment shader inputs looking for the PCOORD input or inputs |
| * for which bit 'k' in sprite_coord_enable is set. |
| */ |
| for (i = 0; i < fs->info.num_inputs; i++) { |
| int slot; |
| const unsigned sn = fs->info.input_semantic_name[i]; |
| const unsigned si = fs->info.input_semantic_index[i]; |
| |
| if (sn == wide->sprite_coord_semantic) { |
| /* Note that sprite_coord_enable is a bitfield of 32 bits. */ |
| if (si >= 32 || !(rast->sprite_coord_enable & (1 << si))) |
| continue; |
| } else if (sn != TGSI_SEMANTIC_PCOORD) { |
| continue; |
| } |
| |
| /* OK, this generic attribute needs to be replaced with a |
| * sprite coord (see above). |
| */ |
| slot = draw_alloc_extra_vertex_attrib(draw, sn, si); |
| |
| /* add this slot to the texcoord-gen list */ |
| wide->texcoord_gen_slot[wide->num_texcoord_gen++] = slot; |
| } |
| } |
| |
| wide->psize_slot = -1; |
| if (rast->point_size_per_vertex) { |
| /* find PSIZ vertex output */ |
| const struct draw_vertex_shader *vs = draw->vs.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 widepoint_flush( struct draw_stage *stage, unsigned flags ) |
| { |
| struct draw_context *draw = stage->draw; |
| struct pipe_context *pipe = draw->pipe; |
| |
| stage->point = widepoint_first_point; |
| stage->next->flush( stage->next, flags ); |
| |
| draw_remove_extra_vertex_attribs(draw); |
| |
| /* 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 widepoint_reset_stipple_counter( struct draw_stage *stage ) |
| { |
| stage->next->reset_stipple_counter( stage->next ); |
| } |
| |
| |
| static void widepoint_destroy( struct draw_stage *stage ) |
| { |
| draw_free_temp_verts( stage ); |
| FREE( stage ); |
| } |
| |
| |
| struct draw_stage *draw_wide_point_stage( struct draw_context *draw ) |
| { |
| struct widepoint_stage *wide = CALLOC_STRUCT(widepoint_stage); |
| if (wide == NULL) |
| goto fail; |
| |
| wide->stage.draw = draw; |
| wide->stage.name = "wide-point"; |
| wide->stage.next = NULL; |
| wide->stage.point = widepoint_first_point; |
| wide->stage.line = draw_pipe_passthrough_line; |
| wide->stage.tri = draw_pipe_passthrough_tri; |
| wide->stage.flush = widepoint_flush; |
| wide->stage.reset_stipple_counter = widepoint_reset_stipple_counter; |
| wide->stage.destroy = widepoint_destroy; |
| |
| if (!draw_alloc_temp_verts( &wide->stage, 4 )) |
| goto fail; |
| |
| wide->sprite_coord_semantic = |
| draw->pipe->screen->get_param(draw->pipe->screen, PIPE_CAP_TGSI_TEXCOORD) |
| ? |
| TGSI_SEMANTIC_TEXCOORD : TGSI_SEMANTIC_GENERIC; |
| |
| return &wide->stage; |
| |
| fail: |
| if (wide) |
| wide->stage.destroy( &wide->stage ); |
| |
| return NULL; |
| } |