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134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.3
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*
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* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Keith Whitwell <keith@tungstengraphics.com>
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*/
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#include <precomp.h>
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void vbo_exec_init( struct gl_context *ctx )
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{
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struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
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exec->ctx = ctx;
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/* Initialize the arrayelt helper
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*/
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if (!ctx->aelt_context &&
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!_ae_create_context( ctx ))
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return;
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vbo_exec_vtx_init( exec );
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vbo_exec_array_init( exec );
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/* Hook our functions into exec and compile dispatch tables.
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*/
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_mesa_install_exec_vtxfmt( ctx, &exec->vtxfmt );
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ctx->Driver.NeedFlush = 0;
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ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
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ctx->Driver.BeginVertices = vbo_exec_BeginVertices;
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ctx->Driver.FlushVertices = vbo_exec_FlushVertices;
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vbo_exec_invalidate_state( ctx, ~0 );
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}
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void vbo_exec_destroy( struct gl_context *ctx )
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{
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struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
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if (ctx->aelt_context) {
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_ae_destroy_context( ctx );
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ctx->aelt_context = NULL;
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}
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vbo_exec_vtx_destroy( exec );
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vbo_exec_array_destroy( exec );
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}
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/**
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* Really want to install these callbacks to a central facility to be
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* invoked according to the state flags. That will have to wait for a
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* mesa rework:
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*/
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void vbo_exec_invalidate_state( struct gl_context *ctx, GLuint new_state )
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{
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struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
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if (new_state & _NEW_EVAL)
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exec->eval.recalculate_maps = 1;
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_ae_invalidate_state(ctx, new_state);
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}
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/**
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* Figure out the number of transform feedback primitives that will be output
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* by the given _mesa_prim command, assuming that no geometry shading is done
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* and primitive restart is not used.
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*
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* This is intended for use by driver back-ends in implementing the
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* PRIMITIVES_GENERATED and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries.
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*/
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size_t
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count_tessellated_primitives(const struct _mesa_prim *prim)
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{
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size_t num_primitives;
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switch (prim->mode) {
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case GL_POINTS:
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num_primitives = prim->count;
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break;
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case GL_LINE_STRIP:
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num_primitives = prim->count >= 2 ? prim->count - 1 : 0;
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break;
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case GL_LINE_LOOP:
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num_primitives = prim->count >= 2 ? prim->count : 0;
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break;
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case GL_LINES:
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num_primitives = prim->count / 2;
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break;
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case GL_TRIANGLE_STRIP:
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case GL_TRIANGLE_FAN:
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case GL_POLYGON:
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num_primitives = prim->count >= 3 ? prim->count - 2 : 0;
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break;
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case GL_TRIANGLES:
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num_primitives = prim->count / 3;
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break;
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case GL_QUAD_STRIP:
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num_primitives = prim->count >= 4 ? ((prim->count / 2) - 1) * 2 : 0;
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break;
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case GL_QUADS:
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num_primitives = (prim->count / 4) * 2;
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break;
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default:
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assert(!"Unexpected primitive type in count_tessellated_primitives");
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num_primitives = 0;
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break;
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}
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return num_primitives * prim->num_instances;
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}
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