| /************************************************************************** |
| * |
| * Copyright 2008 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. |
| * |
| **************************************************************************/ |
| |
| #include "util/u_memory.h" |
| #include "pipe/p_context.h" |
| #include "draw/draw_context.h" |
| #include "draw/draw_private.h" |
| #include "draw/draw_pt.h" |
| |
| struct pt_post_vs { |
| struct draw_context *draw; |
| |
| boolean (*run)( struct pt_post_vs *pvs, |
| struct draw_vertex_info *info ); |
| }; |
| |
| static INLINE void |
| initialize_vertex_header(struct vertex_header *header) |
| { |
| header->clipmask = 0; |
| header->edgeflag = 1; |
| header->pad = 0; |
| header->vertex_id = UNDEFINED_VERTEX_ID; |
| } |
| |
| static INLINE float |
| dot4(const float *a, const float *b) |
| { |
| return (a[0]*b[0] + |
| a[1]*b[1] + |
| a[2]*b[2] + |
| a[3]*b[3]); |
| } |
| |
| static INLINE unsigned |
| compute_clipmask_gl(const float *clip, /*const*/ float plane[][4], unsigned nr) |
| { |
| unsigned mask = 0x0; |
| unsigned i; |
| |
| #if 0 |
| debug_printf("compute clipmask %f %f %f %f\n", |
| clip[0], clip[1], clip[2], clip[3]); |
| assert(clip[3] != 0.0); |
| #endif |
| |
| /* Do the hardwired planes first: |
| */ |
| if (-clip[0] + clip[3] < 0) mask |= (1<<0); |
| if ( clip[0] + clip[3] < 0) mask |= (1<<1); |
| if (-clip[1] + clip[3] < 0) mask |= (1<<2); |
| if ( clip[1] + clip[3] < 0) mask |= (1<<3); |
| if ( clip[2] + clip[3] < 0) mask |= (1<<4); /* match mesa clipplane numbering - for now */ |
| if (-clip[2] + clip[3] < 0) mask |= (1<<5); /* match mesa clipplane numbering - for now */ |
| |
| /* Followed by any remaining ones: |
| */ |
| for (i = 6; i < nr; i++) { |
| if (dot4(clip, plane[i]) < 0) |
| mask |= (1<<i); |
| } |
| |
| return mask; |
| } |
| |
| |
| /* The normal case - cliptest, rhw divide, viewport transform. |
| * |
| * Also handle identity viewport here at the expense of a few wasted |
| * instructions |
| */ |
| static boolean post_vs_cliptest_viewport_gl( struct pt_post_vs *pvs, |
| struct draw_vertex_info *info ) |
| { |
| struct vertex_header *out = info->verts; |
| const float *scale = pvs->draw->viewport.scale; |
| const float *trans = pvs->draw->viewport.translate; |
| const unsigned pos = draw_current_shader_position_output(pvs->draw); |
| unsigned clipped = 0; |
| unsigned j; |
| |
| if (0) debug_printf("%s count, %d\n", __FUNCTION__, info->count); |
| |
| for (j = 0; j < info->count; j++) { |
| float *position = out->data[pos]; |
| |
| initialize_vertex_header(out); |
| #if 0 |
| debug_printf("%d) io = %p, data = %p = [%f, %f, %f, %f]\n", |
| j, out, position, position[0], position[1], position[2], position[3]); |
| #endif |
| |
| out->clip[0] = position[0]; |
| out->clip[1] = position[1]; |
| out->clip[2] = position[2]; |
| out->clip[3] = position[3]; |
| |
| out->vertex_id = 0xffff; |
| out->clipmask = compute_clipmask_gl(out->clip, |
| pvs->draw->plane, |
| pvs->draw->nr_planes); |
| clipped += out->clipmask; |
| |
| if (out->clipmask == 0) |
| { |
| /* divide by w */ |
| float w = 1.0f / position[3]; |
| |
| /* Viewport mapping */ |
| position[0] = position[0] * w * scale[0] + trans[0]; |
| position[1] = position[1] * w * scale[1] + trans[1]; |
| position[2] = position[2] * w * scale[2] + trans[2]; |
| position[3] = w; |
| #if 0 |
| debug_printf("post viewport: %f %f %f %f\n", |
| position[0], |
| position[1], |
| position[2], |
| position[3]); |
| #endif |
| } |
| |
| out = (struct vertex_header *)( (char *)out + info->stride ); |
| } |
| |
| return clipped != 0; |
| } |
| |
| |
| |
| /* As above plus edgeflags |
| */ |
| static boolean |
| post_vs_cliptest_viewport_gl_edgeflag(struct pt_post_vs *pvs, |
| struct draw_vertex_info *info) |
| { |
| unsigned j; |
| boolean needpipe; |
| |
| needpipe = post_vs_cliptest_viewport_gl(pvs, info); |
| |
| /* If present, copy edgeflag VS output into vertex header. |
| * Otherwise, leave header as is. |
| */ |
| if (pvs->draw->vs.edgeflag_output) { |
| struct vertex_header *out = info->verts; |
| int ef = pvs->draw->vs.edgeflag_output; |
| |
| for (j = 0; j < info->count; j++) { |
| const float *edgeflag = out->data[ef]; |
| out->edgeflag = !(edgeflag[0] != 1.0f); |
| needpipe |= !out->edgeflag; |
| out = (struct vertex_header *)( (char *)out + info->stride ); |
| } |
| } |
| return needpipe; |
| } |
| |
| |
| |
| |
| /* If bypass_clipping is set, skip cliptest and rhw divide. |
| */ |
| static boolean post_vs_viewport( struct pt_post_vs *pvs, |
| struct draw_vertex_info *info ) |
| { |
| struct vertex_header *out = info->verts; |
| const float *scale = pvs->draw->viewport.scale; |
| const float *trans = pvs->draw->viewport.translate; |
| const unsigned pos = draw_current_shader_position_output(pvs->draw); |
| unsigned j; |
| |
| if (0) debug_printf("%s\n", __FUNCTION__); |
| for (j = 0; j < info->count; j++) { |
| float *position = out->data[pos]; |
| |
| initialize_vertex_header(out); |
| /* Viewport mapping only, no cliptest/rhw divide |
| */ |
| position[0] = position[0] * scale[0] + trans[0]; |
| position[1] = position[1] * scale[1] + trans[1]; |
| position[2] = position[2] * scale[2] + trans[2]; |
| |
| out = (struct vertex_header *)((char *)out + info->stride); |
| } |
| |
| return FALSE; |
| } |
| |
| |
| /* If bypass_clipping is set and we have an identity viewport, nothing |
| * to do. |
| */ |
| static boolean post_vs_none( struct pt_post_vs *pvs, |
| struct draw_vertex_info *info ) |
| { |
| struct vertex_header *out = info->verts; |
| |
| if (0) debug_printf("%s\n", __FUNCTION__); |
| /* just initialize the vertex_id in all headers */ |
| for (j = 0; j < info->count; j++) { |
| initialize_vertex_header(out); |
| |
| out = (struct vertex_header *)((char *)out + info->stride); |
| } |
| return FALSE; |
| } |
| |
| boolean draw_pt_post_vs_run( struct pt_post_vs *pvs, |
| struct draw_vertex_info *info ) |
| { |
| return pvs->run( pvs, info ); |
| } |
| |
| |
| void draw_pt_post_vs_prepare( struct pt_post_vs *pvs, |
| boolean bypass_clipping, |
| boolean bypass_viewport, |
| boolean opengl, |
| boolean need_edgeflags ) |
| { |
| if (!need_edgeflags) { |
| if (bypass_clipping) { |
| if (bypass_viewport) |
| pvs->run = post_vs_none; |
| else |
| pvs->run = post_vs_viewport; |
| } |
| else { |
| /* if (opengl) */ |
| pvs->run = post_vs_cliptest_viewport_gl; |
| } |
| } |
| else { |
| /* If we need to copy edgeflags to the vertex header, it should |
| * mean we're running the primitive pipeline. Hence the bypass |
| * flags should be false. |
| */ |
| assert(!bypass_clipping); |
| assert(!bypass_viewport); |
| pvs->run = post_vs_cliptest_viewport_gl_edgeflag; |
| } |
| } |
| |
| |
| struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw ) |
| { |
| struct pt_post_vs *pvs = CALLOC_STRUCT( pt_post_vs ); |
| if (!pvs) |
| return NULL; |
| |
| pvs->draw = draw; |
| |
| return pvs; |
| } |
| |
| void draw_pt_post_vs_destroy( struct pt_post_vs *pvs ) |
| { |
| FREE(pvs); |
| } |