540 lines
12 KiB
C++
540 lines
12 KiB
C++
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/*
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* Copyright (c) 1993-1995 Argonaut Technologies Limited. All rights reserved.
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*
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* $Id: zbrendr.c 1.36 1995/08/31 16:48:02 sam Exp $
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* $Locker: sam $
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*
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* Given world, a camera, a vieport and a pixmap - perform the rendering
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*/
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#include "zb.h"
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#include "shortcut.h"
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#include "brassert.h"
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static char rscid[] = "$Id: zbrendr.c 1.36 1995/08/31 16:48:02 sam Exp $";
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/*
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* System defaults
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*/
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extern br_model default_model;
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extern br_material default_material;
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STATIC void ZbActorRenderOnScreen(br_actor *ap,
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br_model *model,
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br_material *material,
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br_uint_8 style);
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/*
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* Table of functions to call for each render style
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*/
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STATIC void (*ZbRenderStyleCalls[])(
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br_actor *actor,
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br_model *model,
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br_material *material,
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br_uint_8 style,
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int on_screen) = {
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ZbMeshRender, /* BR_RSTYLE_DEFAULT */
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ZbNullRender, /* BR_RSTYLE_NONE */
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ZbMeshRenderPoints, /* BR_RSTYLE_POINTS */
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ZbMeshRenderEdges, /* BR_RSTYLE_EDGES */
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ZbMeshRender, /* BR_RSTYLE_FACES */
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ZbBoundingBoxRenderPoints, /* BR_RSTYLE_BOUNDING_POINTS */
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ZbBoundingBoxRenderEdges, /* BR_RSTYLE_BOUNDING_EDGES */
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ZbBoundingBoxRenderFaces, /* BR_RSTYLE_BOUNDING_FACES */
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};
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/*
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* Renders a model with current settings
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*/
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void BR_PUBLIC_ENTRY BrZbModelRender(br_actor *actor,
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br_model *model,
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br_material *material,
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br_uint_8 style,
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int on_screen,
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int use_custom)
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{
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UASSERT(fw.rendering);
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UASSERT(model != NULL);
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UASSERT(material != NULL);
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UASSERT(actor != NULL);
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UASSERT(model->prep_flags & MODUF_REGISTERED);
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/*
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* If model has custom callback, invoke that
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*/
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if(use_custom && (model->flags & BR_MODF_CUSTOM))
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model->custom(actor,model,material,NULL,style,on_screen,
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&fw.model_to_view, &fw.model_to_screen);
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else
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ZbRenderStyleCalls[style](actor, model, material, style, on_screen);
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}
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/*
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* Rendering traversal for the given actor
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*
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*/
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STATIC void ZbActorRender(br_actor *ap,
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br_model *model,
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br_material *material,
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br_uint_8 style)
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{
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/*
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* Saved state
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*/
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br_matrix4 m_to_s;
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br_matrix34 m_to_v;
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br_matrix34 m_to_e;
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br_material *this_material;
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br_model *this_model;
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br_actor *a;
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int s;
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/*
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* Ignore actors with no children that are not models, and actors with renderstyle = NONE
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*/
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if(ap->children == NULL && ap->type != BR_ACTOR_MODEL)
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return;
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if(ap->render_style == BR_RSTYLE_NONE)
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return;
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/*
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* See if this actor overrides default material, model or style
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*/
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this_material = ap->material?ap->material:material;
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this_model = ap->model?ap->model:model;
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if(ap->render_style != BR_RSTYLE_DEFAULT)
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style = ap->render_style;
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/*
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* Catch special case of identity transforms
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*/
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if(ap->t.type == BR_TRANSFORM_IDENTITY) {
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/**
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** Actor has no transform
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**/
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switch(ap->type) {
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case BR_ACTOR_MODEL:
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/*
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* This is a model - see if model's bounding box is on screen
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*/
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if((s = BrOnScreenCheck(&this_model->bounds)) != OSC_REJECT)
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BrZbModelRender(ap,this_model,this_material,style,s,1);
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break;
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case BR_ACTOR_BOUNDS:
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/*
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* A bounding box - truncate whole tree if rejected
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*/
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if(BrOnScreenCheck(ap->type_data) == OSC_REJECT)
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/* DONT PROCESS CHILDREN */
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return;
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break;
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case BR_ACTOR_BOUNDS_CORRECT:
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/*
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* A garuanteed bounding box - test to see if it is on screen
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*/
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switch(BrOnScreenCheck(ap->type_data)) {
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case OSC_ACCEPT:
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/*
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* Bounding box is completely on screen - process children with special loop
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*/
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BR_FOR_SIMPLELIST(&ap->children, a)
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ZbActorRenderOnScreen(a,this_model,this_material,style);
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/* FALL THROUGH */
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case OSC_REJECT:
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/* DONT PROCESS CHILDREN */
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return;
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}
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}
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/*
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* Recurse for children
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*/
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BR_FOR_SIMPLELIST(&ap->children, a)
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ZbActorRender(a,this_model,this_material,style);
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} else {
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/**
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** Actor has a transform
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**/
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/*
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* Save the current transforms
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*/
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m_to_s = fw.model_to_screen;
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m_to_v = fw.model_to_view;
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m_to_e = fw.model_to_environment;
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/*
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* See if this actor is on the camera path - if so, generate a new transform
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*/
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if(ap == fw.camera_path[ap->depth].a) {
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BrMatrix34Inverse(&fw.model_to_view,&fw.camera_path[ap->depth].m);
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BrMatrix4Copy(&fw.model_to_screen,&fw.view_to_screen);
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BrMatrix4Pre34(&fw.model_to_screen,&fw.model_to_view);
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} else {
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BrMatrix4PreTransform(&fw.model_to_screen,&ap->t);
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BrMatrix34PreTransform(&fw.model_to_view,&ap->t);
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}
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if(fw.enabled_environment)
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BrMatrix34PreTransform(&fw.model_to_environment,&ap->t);
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switch(ap->type) {
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case BR_ACTOR_MODEL:
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/*
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* This is a model - see if model's bounding box is on screen
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*/
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if((s = BrOnScreenCheck(&this_model->bounds)) != OSC_REJECT)
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BrZbModelRender(ap,this_model,this_material,style,s,1);
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break;
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case BR_ACTOR_BOUNDS:
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/*
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* A bounding box - truncate whole tree if rejected
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*/
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if(BrOnScreenCheck(ap->type_data) == OSC_REJECT) {
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fw.model_to_view = m_to_v;
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fw.model_to_screen = m_to_s;
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fw.model_to_environment = m_to_e;
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return;
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}
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break;
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case BR_ACTOR_BOUNDS_CORRECT:
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/*
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* A garuanteed bounding box - test to see if it is on screen
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*/
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switch(BrOnScreenCheck(ap->type_data)) {
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case OSC_ACCEPT:
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/*
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* Bounding box is completely on screen - process children with special loop
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*/
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BR_FOR_SIMPLELIST(&ap->children, a)
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ZbActorRenderOnScreen(a,this_model,this_material,style);
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/* FALL THROUGH */
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case OSC_REJECT:
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/*
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* Don't process children
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*/
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fw.model_to_view = m_to_v;
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fw.model_to_screen = m_to_s;
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fw.model_to_environment = m_to_e;
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return;
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}
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}
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/*
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* Recurse for children
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*/
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BR_FOR_SIMPLELIST(&ap->children, a)
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ZbActorRender(a,this_model,this_material,style);
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/*
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* Restore transforms
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*/
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fw.model_to_view = m_to_v;
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fw.model_to_screen = m_to_s;
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fw.model_to_environment = m_to_e;
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}
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}
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/*
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* Rendering traversal for an actor that is completely on screen, along
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* with any children
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*/
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STATIC void ZbActorRenderOnScreen(br_actor *ap,
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br_model *model,
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br_material *material,
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br_uint_8 style)
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{
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/*
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* Saved state
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*/
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br_matrix4 m_to_s;
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br_matrix34 m_to_v;
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br_matrix34 m_to_e;
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br_material *this_material;
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br_model *this_model;
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br_actor *a;
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/*
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* Ignore actors with no children that are not models, and actors with renderstyle = NONE
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*/
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if(ap->children == NULL && ap->type != BR_ACTOR_MODEL)
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return;
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if(ap->render_style == BR_RSTYLE_NONE)
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return;
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/*
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* See if this actor overrides default material, model or style
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*/
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this_material = ap->material?ap->material:material;
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this_model = ap->model?ap->model:model;
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if(ap->render_style != BR_RSTYLE_DEFAULT)
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style = ap->render_style;
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/*
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* Catch special case of identity transforms
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*/
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if(ap->t.type == BR_TRANSFORM_IDENTITY) {
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/*
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* This actor has an no transform
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*/
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if(ap->type == BR_ACTOR_MODEL)
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BrZbModelRender(ap,this_model,this_material,style,OSC_ACCEPT,1);
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BR_FOR_SIMPLELIST(&ap->children, a)
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ZbActorRenderOnScreen(a,this_model,this_material,style);
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return;
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} else {
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/*
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* Actor has a transform
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*/
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m_to_s = fw.model_to_screen;
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m_to_v = fw.model_to_view;
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m_to_e = fw.model_to_environment;
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/*
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* See if this actor is on the camera path - if so, generate a new transform
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*/
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if(ap == fw.camera_path[ap->depth].a) {
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/*
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* Save model_to_screen and model_to_view
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*/
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BrMatrix34Inverse(&fw.model_to_view,&fw.camera_path[ap->depth].m);
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BrMatrix4Copy(&fw.model_to_screen,&fw.view_to_screen);
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BrMatrix4Pre34(&fw.model_to_screen,&fw.model_to_view);
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} else {
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BrMatrix4PreTransform(&fw.model_to_screen,&ap->t);
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BrMatrix34PreTransform(&fw.model_to_view,&ap->t);
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}
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if(fw.enabled_environment)
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BrMatrix34PreTransform(&fw.model_to_environment,&ap->t);
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if(ap->type == BR_ACTOR_MODEL)
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BrZbModelRender(ap,this_model,this_material,style,OSC_ACCEPT,1);
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BR_FOR_SIMPLELIST(&ap->children, a)
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ZbActorRenderOnScreen(a,this_model,this_material,style);
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/*
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* Restore transforms
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*/
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fw.model_to_view = m_to_v;
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fw.model_to_screen = m_to_s;
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fw.model_to_environment = m_to_e;
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return;
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}
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}
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/*
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* BrZbSceneRenderBegin()
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*
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* Setup a new scene to be rendered - processes the camera, lights
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* and environment
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*/
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void BR_PUBLIC_ENTRY BrZbSceneRenderBegin(br_actor *world,
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br_actor *camera,
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br_pixelmap *colour_buffer,
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br_pixelmap *depth_buffer)
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{
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br_camera *camera_type;
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br_matrix34 camera_tfm;
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br_actor *a;
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int i,j;
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UASSERT(zb.type != NULL);
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UASSERT(zb.type->colour_type == colour_buffer->type);
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UASSERT(zb.type->depth_type == depth_buffer->type);
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UASSERT(fw.rendering == 0);
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/*
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* Set flag to say we are rendering
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*/
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fw.rendering = 1;
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/*
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* Constant parameters for renderer
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*/
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fw.output = colour_buffer;
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if(depth_buffer->row_bytes * zb.type->colour_row_size !=
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colour_buffer->row_bytes * zb.type->depth_row_size)
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BR_ERROR0("Colour and depth strides do not match");
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#if 0
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/*
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* Work out y*row_width table
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*/
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if(zb.row_width != colour_buffer->row_bytes) {
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for(i=0, j=0; i < MAX_OUTPUT_HEIGHT; i++, j+= zb.row_width)
|
||
|
|
zb.row_table[i] = j;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
zb.row_width = colour_buffer->row_bytes;
|
||
|
|
zb.depth_row_width = depth_buffer->row_bytes;
|
||
|
|
|
||
|
|
|
||
|
|
zb.colour_buffer = (char *)colour_buffer->pixels+
|
||
|
|
colour_buffer->base_y*colour_buffer->row_bytes;
|
||
|
|
|
||
|
|
|
||
|
|
zb.depth_buffer = (void *)((char *)depth_buffer->pixels+
|
||
|
|
depth_buffer->base_y*depth_buffer->row_bytes);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Parameters of viewport (origin is at pixel centre, so add [0.5,0.5])
|
||
|
|
*/
|
||
|
|
if(colour_buffer->width > MAX_OUTPUT_WIDTH ||
|
||
|
|
colour_buffer->height > MAX_OUTPUT_HEIGHT)
|
||
|
|
BR_ERROR("BrZbSceneRender: pixelmap is too big");
|
||
|
|
|
||
|
|
fw.vp_ox = BR_SCALAR(colour_buffer->base_x+colour_buffer->width/2)+BR_SCALAR(0.5);
|
||
|
|
fw.vp_width = BR_SCALAR(colour_buffer->width/2);
|
||
|
|
|
||
|
|
fw.vp_oy = BR_SCALAR(colour_buffer->height/2)+BR_SCALAR(0.5);
|
||
|
|
fw.vp_height = -BR_SCALAR(colour_buffer->height/2);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Work out View Transform from info. in camera actor
|
||
|
|
*/
|
||
|
|
fw.vtos_type = BrCameraToScreenMatrix4(&fw.view_to_screen,camera);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Collect transforms from camera to root
|
||
|
|
*
|
||
|
|
* Make a stack of cumulative transforms for each level between
|
||
|
|
* the camera and the root - this is so that model->view
|
||
|
|
* transforms can use the shortest route, rather than via the root
|
||
|
|
*/
|
||
|
|
for(i=0; i< MAX_CAMERA_DEPTH; i++)
|
||
|
|
fw.camera_path[i].a = NULL;
|
||
|
|
|
||
|
|
i = camera->depth;
|
||
|
|
a = camera;
|
||
|
|
BrMatrix34Identity(&fw.camera_path[i].m);
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
if(i > 0) {
|
||
|
|
fw.camera_path[i].a = a;
|
||
|
|
BrMatrix34Transform(&fw.camera_path[i].m,&a->t);
|
||
|
|
a =a->parent;
|
||
|
|
i --;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
for( ; i > 0; a = a->parent, i--) {
|
||
|
|
ASSERT(a != NULL);
|
||
|
|
BrMatrix34Transform(&camera_tfm,&a->t);
|
||
|
|
BrMatrix34Mul(&fw.camera_path[i-1].m,&fw.camera_path[i].m,&camera_tfm);
|
||
|
|
fw.camera_path[i].a = a;
|
||
|
|
}
|
||
|
|
|
||
|
|
if(world != a)
|
||
|
|
BR_ERROR0("camera is not in world hierachy");
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Make world->view as initial model->view
|
||
|
|
*/
|
||
|
|
BrMatrix34Inverse(&fw.model_to_view,&fw.camera_path[0].m);
|
||
|
|
|
||
|
|
BrMatrix4Copy(&fw.model_to_screen,&fw.view_to_screen);
|
||
|
|
BrMatrix4Pre34(&fw.model_to_screen,&fw.model_to_view);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Preprocess active lights, and environment
|
||
|
|
*/
|
||
|
|
SurfacePerScene(world,zb.type->true_colour);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* BrZbSceneRenderAdd()
|
||
|
|
*
|
||
|
|
* Add a sub-tree of actors to the current rendering
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
void BR_PUBLIC_ENTRY BrZbSceneRenderAdd(br_actor *tree)
|
||
|
|
{
|
||
|
|
UASSERT(tree);
|
||
|
|
UASSERT(fw.rendering);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Walk the provided world and add transformed models to scene
|
||
|
|
*/
|
||
|
|
ZbActorRender(tree, fw.default_model, fw.default_material, BR_RSTYLE_DEFAULT);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* BrZbSceneRenderEnd()
|
||
|
|
*
|
||
|
|
* Finish rendering a scene - does nothing, but exists in case we
|
||
|
|
* ever need a flush of some sort
|
||
|
|
*/
|
||
|
|
void BR_PUBLIC_ENTRY BrZbSceneRenderEnd(void)
|
||
|
|
{
|
||
|
|
UASSERT(fw.rendering);
|
||
|
|
fw.rendering = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* BrZbSceneRender()
|
||
|
|
*
|
||
|
|
* Wrapper that sets up, renders and flushes a scene
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
void BR_PUBLIC_ENTRY BrZbSceneRender(br_actor *world,
|
||
|
|
br_actor *camera,
|
||
|
|
br_pixelmap *colour_buffer,
|
||
|
|
br_pixelmap *depth_buffer)
|
||
|
|
{
|
||
|
|
BrZbSceneRenderBegin(world, camera, colour_buffer, depth_buffer);
|
||
|
|
BrZbSceneRenderAdd(world);
|
||
|
|
BrZbSceneRenderEnd();
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Render function for BR_RSTYLE_NONE
|
||
|
|
*/
|
||
|
|
STATIC void ZbNullRender(br_actor *actor,
|
||
|
|
br_model *model,
|
||
|
|
br_material *material,
|
||
|
|
br_uint_8 style,
|
||
|
|
int on_screen)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set a callback function for bounding rectangles
|
||
|
|
*/
|
||
|
|
br_renderbounds_cbfn * BR_PUBLIC_ENTRY BrZbSetRenderBoundsCallback(br_renderbounds_cbfn *new_cbfn)
|
||
|
|
{
|
||
|
|
br_renderbounds_cbfn *old_cbfn = zb.bounds_call;
|
||
|
|
|
||
|
|
zb.bounds_call = new_cbfn;
|
||
|
|
|
||
|
|
return old_cbfn;
|
||
|
|
}
|
||
|
|
|