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pixelcity/Entity.cpp

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/*-----------------------------------------------------------------------------
Entity.cpp
Copyright (c) 2005 Shamus Young
All Rights Reserved
-------------------------------------------------------------------------------
An entity is any renderable stationary object in the world. This is an
abstract class. This module gathers up the Entities, sorts them by
texture use and location, and then stores them in OpenGL render lists
for faster rendering.
-----------------------------------------------------------------------------*/
#include <windows.h>
#include <math.h>
#include <gl\gl.h>
#include "camera.h"
#include "entity.h"
#include "macro.h"
#include "math.h"
#include "render.h"
#include "texture.h"
#include "world.h"
#include "visible.h"
#include "win.h"
struct entity
{
CEntity* object;
};
struct cell
{
unsigned list_textured;
unsigned list_flat;
unsigned list_flat_wireframe;
unsigned list_alpha;
GLvector pos;
};
static cell cell_list[GRID_SIZE][GRID_SIZE];
static int entity_count;
static entity* entity_list;
static bool sorted;
static bool compiled;
static int polycount;
static int compile_x;
static int compile_y;
static int compile_count;
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
static int do_compare (const void *arg1, const void *arg2 )
{
struct entity* e1 = (struct entity*)arg1;
struct entity* e2 = (struct entity*)arg2;
if (e1->object->Alpha () && !e2->object->Alpha ())
return 1;
if (!e1->object->Alpha () && e2->object->Alpha ())
return -1;
if (e1->object->Texture () > e2->object->Texture ())
return 1;
else if (e1->object->Texture () < e2->object->Texture ())
return -1;
return 0;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void add (CEntity* b)
{
entity_list = (entity*)realloc (entity_list, sizeof (entity) * (entity_count + 1));
entity_list[entity_count].object = b;
entity_count++;
polycount = 0;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
static void do_compile ()
{
int i;
int x, y;
if (compiled)
return;
x = compile_x;
y = compile_y;
//Changing textures is pretty expensive, and thus sorting the entites so that
//they are grouped by texture used can really improve framerate.
//qsort (entity_list, entity_count, sizeof (struct entity), do_compare);
//sorted = true;
//Now group entites on the grid
//make a list for the textured objects in this region
if (!cell_list[x][y].list_textured)
cell_list[x][y].list_textured = glGenLists(1);
glNewList (cell_list[x][y].list_textured, GL_COMPILE);
cell_list[x][y].pos = glVector (GRID_TO_WORLD(x), 0.0f, (float)y * GRID_RESOLUTION);
for (i = 0; i < entity_count; i++) {
GLvector pos = entity_list[i].object->Center ();
if (WORLD_TO_GRID(pos.x) == x && WORLD_TO_GRID(pos.z) == y && !entity_list[i].object->Alpha ()) {
glBindTexture(GL_TEXTURE_2D, entity_list[i].object->Texture ());
entity_list[i].object->Render ();
}
}
glEndList();
//Make a list of flat-color stuff (A/C units, ledges, roofs, etc.)
if (!cell_list[x][y].list_flat)
cell_list[x][y].list_flat = glGenLists(1);
glNewList (cell_list[x][y].list_flat, GL_COMPILE);
glEnable (GL_CULL_FACE);
cell_list[x][y].pos = glVector (GRID_TO_WORLD(x), 0.0f, (float)y * GRID_RESOLUTION);
for (i = 0; i < entity_count; i++) {
GLvector pos = entity_list[i].object->Center ();
if (WORLD_TO_GRID(pos.x) == x && WORLD_TO_GRID(pos.z) == y && !entity_list[i].object->Alpha ()) {
entity_list[i].object->RenderFlat (false);
}
}
glEndList();
//Now a list of flat-colored stuff that will be wireframe friendly
if (!cell_list[x][y].list_flat_wireframe)
cell_list[x][y].list_flat_wireframe = glGenLists(1);
glNewList (cell_list[x][y].list_flat_wireframe, GL_COMPILE);
glEnable (GL_CULL_FACE);
cell_list[x][y].pos = glVector (GRID_TO_WORLD(x), 0.0f, (float)y * GRID_RESOLUTION);
for (i = 0; i < entity_count; i++) {
GLvector pos = entity_list[i].object->Center ();
if (WORLD_TO_GRID(pos.x) == x && WORLD_TO_GRID(pos.z) == y && !entity_list[i].object->Alpha ()) {
entity_list[i].object->RenderFlat (true);
}
}
glEndList();
//Now a list of stuff to be alpha-blended, and thus rendered last
if (!cell_list[x][y].list_alpha)
cell_list[x][y].list_alpha = glGenLists(1);
glNewList (cell_list[x][y].list_alpha, GL_COMPILE);
cell_list[x][y].pos = glVector (GRID_TO_WORLD(x), 0.0f, (float)y * GRID_RESOLUTION);
glDepthMask (false);
glEnable (GL_BLEND);
glDisable (GL_CULL_FACE);
for (i = 0; i < entity_count; i++) {
GLvector pos = entity_list[i].object->Center ();
if (WORLD_TO_GRID(pos.x) == x && WORLD_TO_GRID(pos.z) == y && entity_list[i].object->Alpha ()) {
glBindTexture(GL_TEXTURE_2D, entity_list[i].object->Texture ());
entity_list[i].object->Render ();
}
}
glDepthMask (true);
glEndList();
//now walk the grid
compile_x++;
if (compile_x == GRID_SIZE) {
compile_x = 0;
compile_y++;
if (compile_y == GRID_SIZE)
compiled = true;
}
compile_count++;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
bool EntityReady ()
{
return compiled;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
float EntityProgress ()
{
return (float)compile_count / (GRID_SIZE * GRID_SIZE);
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void EntityUpdate ()
{
unsigned stop_time;
if (!TextureReady ()) {
sorted = false;
return;
}
if (!sorted) {
qsort (entity_list, entity_count, sizeof (struct entity), do_compare);
sorted = true;
}
//We want to do several cells at once. Enough to get things done, but
//not so many that the program is unresponsive.
stop_time = GetTickCount () + 100;
while (!compiled && GetTickCount () < stop_time)
do_compile ();
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void EntityRender ()
{
int polymode[2];
bool wireframe;
int x, y;
//Draw all textured objects
glGetIntegerv (GL_POLYGON_MODE, &polymode[0]);
wireframe = polymode[0] != GL_FILL;
if (RenderFlat ())
glDisable (GL_TEXTURE_2D);
for (x = 0; x < GRID_SIZE; x++) {
for (y = 0; y < GRID_SIZE; y++) {
if (Visible (x,y))
glCallList (cell_list[x][y].list_textured);
}
}
//draw all flat colored objects
glBindTexture(GL_TEXTURE_2D, 0);
glColor3f (0, 0, 0);
for (x = 0; x < GRID_SIZE; x++) {
for (y = 0; y < GRID_SIZE; y++) {
if (Visible (x, y)) {
if (wireframe)
glCallList (cell_list[x][y].list_flat_wireframe);
else
glCallList (cell_list[x][y].list_flat);
}
}
}
//draw all alpha-blended objects
glBindTexture(GL_TEXTURE_2D, 0);
glColor3f (0, 0, 0);
glEnable (GL_BLEND);
for (x = 0; x < GRID_SIZE; x++) {
for (y = 0; y < GRID_SIZE; y++) {
if (Visible (x,y)) {
glCallList (cell_list[x][y].list_alpha);
}
}
}
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void EntityClear ()
{
for (int i = 0; i < entity_count; i++) {
delete entity_list[i].object;
}
if (entity_list)
free (entity_list);
entity_list = NULL;
entity_count = 0;
compile_x = 0;
compile_y = 0;
compile_count = 0;
compiled = false;
sorted = false;
int x, y;
for (x = 0; x < GRID_SIZE; x++) {
for (y = 0; y < GRID_SIZE; y++) {
glNewList (cell_list[x][y].list_textured, GL_COMPILE);
glEndList();
glNewList (cell_list[x][y].list_alpha, GL_COMPILE);
glEndList();
glNewList (cell_list[x][y].list_flat_wireframe, GL_COMPILE);
glEndList();
glNewList (cell_list[x][y].list_flat, GL_COMPILE);
glEndList();
}
}
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
int EntityCount ()
{
return entity_count;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void EntityInit (void)
{
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
int EntityPolyCount (void)
{
if (!sorted)
return 0;
if (polycount)
return polycount;
for (int i = 0; i < entity_count; i++)
polycount += entity_list[i].object->PolyCount ();
return polycount;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
CEntity::CEntity (void)
{
add (this);
}
void CEntity::Render (void)
{
}
void CEntity::RenderFlat (bool wireframe)
{
}
void CEntity::Update (void)
{
}
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