#include "mtypes.h"
#include "imports.h"
#include "t_context.h"
#include "t_pipeline.h"
struct point_stage_data {
GLvector4f PointSize;
};
#define POINT_STAGE_DATA(stage) ((struct point_stage_data *)stage->privatePtr)
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)[4] = store->PointSize.data;
GLuint i;
if (stage->changed_inputs) {
for (i = 0; i < VB->Count; i++) {
const GLfloat dist = -eye[i][2];
size[i][0] = pointSize / (p0 + dist * (p1 + dist * p2));
}
}
VB->PointSizePtr = &store->PointSize;
return GL_TRUE;
}
static void check_point_size( GLcontext *ctx, struct gl_pipeline_stage *d )
{
d->active = ctx->Point._Attenuated && !ctx->VertexProgram.Enabled;
}
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->privatePtr = MALLOC(sizeof(*store));
store = POINT_STAGE_DATA(stage);
if (!store)
return GL_FALSE;
_mesa_vector4f_alloc( &store->PointSize, 0, VB->Size, 32 );
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) {
_mesa_vector4f_free( &store->PointSize );
FREE( store );
stage->privatePtr = 0;
}
}
const struct gl_pipeline_stage _tnl_point_attenuation_stage =
{
"point size attenuation",
_NEW_POINT,
_NEW_POINT,
GL_FALSE,
VERT_BIT_EYE,
VERT_BIT_POINT_SIZE,
0,
NULL,
free_point_data,
check_point_size,
alloc_point_data
};