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/*
* Mesa 3-D graphics library
* Version: 6.3
*
* Copyright (C) 1999-2005 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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>
*/
#include "main/api_arrayelt.h"
#include "main/glheader.h"
#include "main/mtypes.h"
#include "main/vtxfmt.h"
#include "vbo_context.h"
void vbo_exec_init( struct gl_context *ctx )
{
struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
exec->ctx = ctx;
/* Initialize the arrayelt helper
*/
if (!ctx->aelt_context &&
!_ae_create_context( ctx ))
return;
vbo_exec_vtx_init( exec );
vbo_exec_array_init( exec );
ctx->Driver.NeedFlush = 0;
ctx->Driver.CurrentExecPrimitive = PRIM_OUTSIDE_BEGIN_END;
ctx->Driver.BeginVertices = vbo_exec_BeginVertices;
ctx->Driver.FlushVertices = vbo_exec_FlushVertices;
vbo_exec_invalidate_state( ctx, ~0 );
}
void vbo_exec_destroy( struct gl_context *ctx )
{
struct vbo_exec_context *exec = &vbo_context(ctx)->exec;
if (ctx->aelt_context) {
_ae_destroy_context( ctx );
ctx->aelt_context = NULL;
}
vbo_exec_vtx_destroy( exec );
vbo_exec_array_destroy( exec );
}
/**
* Really want to install these callbacks to a central facility to be
* invoked according to the state flags. That will have to wait for a
* mesa rework:
*/
void vbo_exec_invalidate_state( struct gl_context *ctx, GLuint new_state )
{
struct vbo_context *vbo = vbo_context(ctx);
struct vbo_exec_context *exec = &vbo->exec;
if (!exec->validating && new_state & (_NEW_PROGRAM|_NEW_ARRAY)) {
exec->array.recalculate_inputs = GL_TRUE;
/* If we ended up here because a VAO was deleted, the _DrawArrays
* pointer which pointed to the VAO might be invalid now, so set it
* to NULL. This prevents crashes in driver functions like Clear
* where driver state validation might occur, but the vbo module is
* still in an invalid state.
*
* Drivers should skip vertex array state validation if _DrawArrays
* is NULL. It also has no effect on performance, because attrib
* bindings will be recalculated anyway.
*/
if (vbo->last_draw_method == DRAW_ARRAYS) {
ctx->Array._DrawArrays = NULL;
vbo->last_draw_method = DRAW_NONE;
}
}
if (new_state & _NEW_EVAL)
exec->eval.recalculate_maps = 1;
_ae_invalidate_state(ctx, new_state);
}
/**
* Figure out the number of transform feedback primitives that will be output
* considering the drawing mode, number of vertices, and instance count,
* assuming that no geometry shading is done and primitive restart is not
* used.
*
* This is used by driver back-ends in implementing the PRIMITIVES_GENERATED
* and TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN queries. It is also used to
* pre-validate draw calls in GLES3 (where draw calls only succeed if there is
* enough room in the transform feedback buffer for the result).
*/
size_t
vbo_count_tessellated_primitives(GLenum mode, GLuint count,
GLuint num_instances)
{
size_t num_primitives;
switch (mode) {
case GL_POINTS:
num_primitives = count;
break;
case GL_LINE_STRIP:
num_primitives = count >= 2 ? count - 1 : 0;
break;
case GL_LINE_LOOP:
num_primitives = count >= 2 ? count : 0;
break;
case GL_LINES:
num_primitives = count / 2;
break;
case GL_TRIANGLE_STRIP:
case GL_TRIANGLE_FAN:
case GL_POLYGON:
num_primitives = count >= 3 ? count - 2 : 0;
break;
case GL_TRIANGLES:
num_primitives = count / 3;
break;
case GL_QUAD_STRIP:
num_primitives = count >= 4 ? ((count / 2) - 1) * 2 : 0;
break;
case GL_QUADS:
num_primitives = (count / 4) * 2;
break;
default:
assert(!"Unexpected primitive type in count_tessellated_primitives");
num_primitives = 0;
break;
}
return num_primitives * num_instances;
}
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