diff options
Diffstat (limited to 'src/gallium/auxiliary/draw/draw_pt_post_vs.c')
-rw-r--r-- | src/gallium/auxiliary/draw/draw_pt_post_vs.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pt_post_vs.c b/src/gallium/auxiliary/draw/draw_pt_post_vs.c new file mode 100644 index 0000000000..96dc706b99 --- /dev/null +++ b/src/gallium/auxiliary/draw/draw_pt_post_vs.c @@ -0,0 +1,233 @@ +/************************************************************************** + * + * 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_vbuf.h" +#include "draw/draw_vertex.h" +#include "draw/draw_pt.h" + +struct pt_post_vs { + struct draw_context *draw; + + boolean (*run)( struct pt_post_vs *pvs, + struct vertex_header *vertices, + unsigned count, + unsigned stride ); +}; + + + +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 vertex_header *vertices, + unsigned count, + unsigned stride ) +{ + struct vertex_header *out = vertices; + const float *scale = pvs->draw->viewport.scale; + const float *trans = pvs->draw->viewport.translate; + const unsigned pos = pvs->draw->vs.position_output; + unsigned clipped = 0; + unsigned j; + + if (0) debug_printf("%s\n"); + + for (j = 0; j < count; j++) { + float *position = out->data[pos]; + + 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 + stride ); + } + + return clipped != 0; +} + + + +/* If bypass_clipping is set, skip cliptest and rhw divide. + */ +static boolean post_vs_viewport( struct pt_post_vs *pvs, + struct vertex_header *vertices, + unsigned count, + unsigned stride ) +{ + struct vertex_header *out = vertices; + const float *scale = pvs->draw->viewport.scale; + const float *trans = pvs->draw->viewport.translate; + const unsigned pos = pvs->draw->vs.position_output; + unsigned j; + + if (0) debug_printf("%s\n", __FUNCTION__); + for (j = 0; j < count; j++) { + float *position = out->data[pos]; + + /* 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 + 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 vertex_header *vertices, + unsigned count, + unsigned stride ) +{ + if (0) debug_printf("%s\n", __FUNCTION__); + return FALSE; +} + +boolean draw_pt_post_vs_run( struct pt_post_vs *pvs, + struct vertex_header *pipeline_verts, + unsigned count, + unsigned stride ) +{ + return pvs->run( pvs, pipeline_verts, count, stride ); +} + + +void draw_pt_post_vs_prepare( struct pt_post_vs *pvs, + boolean bypass_clipping, + boolean identity_viewport, + boolean opengl ) +{ + if (bypass_clipping) { + if (identity_viewport) + pvs->run = post_vs_none; + else + pvs->run = post_vs_viewport; + } + else { + //if (opengl) + pvs->run = post_vs_cliptest_viewport_gl; + } +} + + +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); +} |