diff options
author | Keith Whitwell <keith@tungstengraphics.com> | 2000-12-26 05:09:27 +0000 |
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committer | Keith Whitwell <keith@tungstengraphics.com> | 2000-12-26 05:09:27 +0000 |
commit | cab974cf6c2dbfbf5dd5d291e1aae0f8eeb34290 (patch) | |
tree | 45385bd755d8e3876c54b2b0113636f5ceb7976a /src/mesa/tnl/t_vb_points.c | |
parent | d1ff1f6798b003a820f5de9fad835ff352f31afe (diff) |
Major rework of tnl module
New array_cache module
Support 8 texture units in core mesa (now support 8 everywhere)
Rework core mesa statechange operations to avoid flushing on many
noop statechanges.
Diffstat (limited to 'src/mesa/tnl/t_vb_points.c')
-rw-r--r-- | src/mesa/tnl/t_vb_points.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_vb_points.c b/src/mesa/tnl/t_vb_points.c new file mode 100644 index 0000000000..16f9ca9722 --- /dev/null +++ b/src/mesa/tnl/t_vb_points.c @@ -0,0 +1,124 @@ +/* $Id: t_vb_points.c,v 1.1 2000/12/26 05:09:33 keithw Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 Brian Paul 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, sublicense, + * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL 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. + * + * Author: + * Brian Paul <brian@valinux.com> + */ + +#include "mtypes.h" +#include "mem.h" +#include "t_context.h" +#include "t_pipeline.h" + + +struct point_stage_data { + GLvector1f PointSize; +}; + +#define POINT_STAGE_DATA(stage) ((struct point_stage_data *)stage->private) + + +/* + * Compute attenuated point sizes + */ +static GLboolean run_point_stage( GLcontext *ctx, + struct gl_pipeline_stage *stage ) +{ + struct point_stage_data *store = POINT_STAGE_DATA(stage); + struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; + const GLfloat (*eye)[4] = (const GLfloat (*)[4]) VB->EyePtr->data; + const GLfloat p0 = ctx->Point.Params[0]; + const GLfloat p1 = ctx->Point.Params[1]; + const GLfloat p2 = ctx->Point.Params[2]; + const GLfloat pointSize = ctx->Point._Size; + GLfloat *size = store->PointSize.data; + GLuint i; + + if (stage->changed_inputs) { + /* XXX do threshold and min/max clamping here? */ + for (i = 0; i < VB->Count; i++) { + const GLfloat dist = -eye[i][2]; + /* GLfloat dist = GL_SQRT(pos[0]*pos[0]+pos[1]*pos[1]+pos[2]*pos[2]);*/ + size[i] = pointSize / (p0 + dist * (p1 + dist * p2)); + } + } + + VB->PointSizePtr = &store->PointSize; + + return GL_TRUE; +} + + +/* If point size attenuation is on we'll compute the point size for + * each vertex in a special pipeline stage. + */ +static void check_point_size( GLcontext *ctx, struct gl_pipeline_stage *d ) +{ + d->active = ctx->Point._Attenuated; +} + +static GLboolean alloc_point_data( GLcontext *ctx, + struct gl_pipeline_stage *stage ) +{ + struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; + struct point_stage_data *store; + stage->private = MALLOC(sizeof(*store)); + store = POINT_STAGE_DATA(stage); + if (!store) + return GL_FALSE; + + gl_vector1f_alloc( &store->PointSize, 0, VB->Size, 32 ); + + /* Now run the stage. + */ + stage->run = run_point_stage; + return stage->run( ctx, stage ); +} + + +static void free_point_data( struct gl_pipeline_stage *stage ) +{ + struct point_stage_data *store = POINT_STAGE_DATA(stage); + if (store) { + gl_vector1f_free( &store->PointSize ); + FREE( store ); + stage->private = 0; + } +} + +const struct gl_pipeline_stage _tnl_point_attenuation_stage = +{ + "point size attenuation", /* name */ + _NEW_POINT, /* build_state_change */ + _NEW_POINT, /* run_state_change */ + 0, /* active */ + VERT_EYE, /* inputs */ + VERT_POINT_SIZE, /* outputs */ + 0, /* changed_inputs (temporary value) */ + 0, /* stage private data */ + free_point_data, /* destructor */ + check_point_size, /* check */ + alloc_point_data /* run -- initially set to alloc data */ +}; |