1 files changed, 330 insertions, 0 deletions

diff --git a/src/renderer/PointLights.cpp b/src/renderer/PointLights.cpp
new file mode 100644
index 00000000..13872401
--- /dev/null
+++ b/src/renderer/PointLights.cpp
@@ -0,0 +1,330 @@
+#include "common.h"
+
+#include "main.h"
+#include "CutsceneMgr.h"
+#include "Lights.h"
+#include "Camera.h"
+#include "Weather.h"
+#include "World.h"
+#include "Collision.h"
+#include "Sprite.h"
+#include "Timer.h"
+#include "PointLights.h"
+
+int16 CPointLights::NumLights;
+CRegisteredPointLight CPointLights::aLights[NUMPOINTLIGHTS];
+CVector CPointLights::aCachedMapReads[32];
+float CPointLights::aCachedMapReadResults[32];
+int32 CPointLights::NextCachedValue;
+
+void
+CPointLights::Init(void)
+{
+	for(int i = 0; i < ARRAY_SIZE(aCachedMapReads); i++){
+		aCachedMapReads[i] = CVector(0.0f, 0.0f, 0.0f);
+		aCachedMapReadResults[i] = 0.0f;
+	}
+	NextCachedValue = 0;
+}
+
+void
+CPointLights::InitPerFrame(void)
+{
+	NumLights = 0;
+}
+
+#define MAX_DIST 22.0f
+
+void
+CPointLights::AddLight(uint8 type, CVector coors, CVector dir, float radius, float red, float green, float blue, uint8 fogType, bool castExtraShadows)
+{
+	CVector dist;
+	float distance;
+
+	// The check is done in some weird way in the game
+	// we're doing it a bit better here
+	if(NumLights >= NUMPOINTLIGHTS)
+		return;
+
+	dist = coors - TheCamera.GetPosition();
+	if(Abs(dist.x) < MAX_DIST && Abs(dist.y) < MAX_DIST){
+		distance = dist.Magnitude();
+		if(distance < MAX_DIST){
+			aLights[NumLights].type = type;
+			aLights[NumLights].fogType = fogType;
+			aLights[NumLights].coors = coors;
+			aLights[NumLights].dir = dir;
+			aLights[NumLights].radius = radius;
+			aLights[NumLights].castExtraShadows = castExtraShadows;
+			if(distance < MAX_DIST*0.75f){
+				aLights[NumLights].red = red;
+				aLights[NumLights].green = green;
+				aLights[NumLights].blue = blue;
+			}else{
+				float fade = 1.0f - (distance/MAX_DIST - 0.75f)*4.0f;
+				aLights[NumLights].red = red * fade;
+				aLights[NumLights].green = green * fade;
+				aLights[NumLights].blue = blue * fade;
+			}
+			NumLights++;
+		}
+	}
+}
+
+float
+CPointLights::GenerateLightsAffectingObject(Const CVector *objCoors)
+{
+	int i;
+	float ret;
+	CVector dist;
+	float radius, distance;
+
+	ret = 1.0f;
+	for(i = 0; i < NumLights; i++){
+		if(aLights[i].type == LIGHT_FOGONLY || aLights[i].type == LIGHT_FOGONLY_ALWAYS)
+			continue;
+
+		// same weird distance calculation. simplified here
+		dist = aLights[i].coors - *objCoors;
+		radius = aLights[i].radius;
+		if(Abs(dist.x) < radius &&
+		   Abs(dist.y) < radius &&
+		   Abs(dist.z) < radius){
+
+			distance = dist.Magnitude();
+			if(distance < radius){
+
+				float distNorm = distance/radius;
+				if(aLights[i].type == LIGHT_DARKEN){
+					// darken the object the closer it is
+					ret *= distNorm;
+				}else{
+					float intensity;
+					// distance fade
+					if(distNorm < 0.5f)
+						intensity = 1.0f;
+					else
+						intensity = 1.0f - (distNorm - 0.5f)/(1.0f - 0.5f);
+
+					if(distance != 0.0f){
+						CVector dir = dist / distance;
+
+						if(aLights[i].type == LIGHT_DIRECTIONAL){
+							float dot = -DotProduct(dir, aLights[i].dir);
+							intensity *= Max((dot-0.5f)*2.0f, 0.0f);
+						}
+
+						if(intensity > 0.0f)
+							AddAnExtraDirectionalLight(Scene.world,
+								dir.x, dir.y, dir.z,
+								aLights[i].red*intensity, aLights[i].green*intensity, aLights[i].blue*intensity);
+					}
+				}
+			}
+		}
+	}
+
+	return ret;
+}
+
+extern RwRaster *gpPointlightRaster;
+
+void
+CPointLights::RemoveLightsAffectingObject(void)
+{
+	RemoveExtraDirectionalLights(Scene.world);
+}
+
+// for directional fog
+#define FOG_AREA_LENGTH 12.0f
+#define FOG_AREA_WIDTH 5.0f
+// for pointlight fog
+#define FOG_AREA_RADIUS 9.0f
+
+float FogSizes[8] = { 1.3f, 2.0f, 1.7f, 2.0f, 1.4f, 2.1f, 1.5f, 2.3f };
+
+void
+CPointLights::RenderFogEffect(void)
+{
+	int i;
+	float fogginess;
+	CColPoint point;
+	CEntity *entity;
+	float xmin, ymin;
+	float xmax, ymax;
+	int16 xi, yi;
+	CVector spriteCoors;
+	float spritew, spriteh;
+
+	if(CCutsceneMgr::IsRunning())
+		return;
+
+	PUSH_RENDERGROUP("CPointLights::RenderFogEffect");
+
+	RwRenderStateSet(rwRENDERSTATEZWRITEENABLE, (void*)FALSE);
+	RwRenderStateSet(rwRENDERSTATEVERTEXALPHAENABLE, (void*)TRUE);
+	RwRenderStateSet(rwRENDERSTATESRCBLEND, (void*)rwBLENDONE);
+	RwRenderStateSet(rwRENDERSTATEDESTBLEND, (void*)rwBLENDONE);
+	RwRenderStateSet(rwRENDERSTATETEXTURERASTER, gpPointlightRaster);
+
+	CSprite::InitSpriteBuffer();
+
+	for(i = 0; i < NumLights; i++){
+		if(aLights[i].fogType != FOG_NORMAL && aLights[i].fogType != FOG_ALWAYS)
+			continue;
+
+		fogginess = aLights[i].fogType == FOG_NORMAL ? CWeather::Foggyness : 1.0f;
+		if(fogginess == 0.0f)
+			continue;
+
+		if(aLights[i].type == LIGHT_DIRECTIONAL){
+
+			// TODO: test this. haven't found directional fog so far
+
+			float coors2X = aLights[i].coors.x + FOG_AREA_LENGTH*aLights[i].dir.x;
+			float coors2Y = aLights[i].coors.y + FOG_AREA_LENGTH*aLights[i].dir.y;
+
+			if(coors2X < aLights[i].coors.x){
+				xmin = coors2X;
+				xmax = aLights[i].coors.x;
+			}else{
+				xmax = coors2X;
+				xmin = aLights[i].coors.x;
+			}
+			if(coors2Y < aLights[i].coors.y){
+				ymin = coors2Y;
+				ymax = aLights[i].coors.y;
+			}else{
+				ymax = coors2Y;
+				ymin = aLights[i].coors.y;
+			}
+
+			xmin -= 5.0f;
+			ymin -= 5.0f;
+			xmax += 5.0f;
+			ymax += 5.0f;
+
+			for(xi = (int16)xmin - (int16)xmin % 4; xi <= (int16)xmax + 4; xi += 4){
+				for(yi = (int16)ymin - (int16)ymin % 4; yi <= (int16)ymax + 4; yi += 4){
+					// Some kind of pseudo random number?
+					int r = (xi ^ yi)>>2 & 0xF;
+					if((r & 1) == 0)
+						continue;
+
+					// Check if fog effect is close enough to directional line in x and y
+					float dx = xi - aLights[i].coors.x;
+					float dy = yi - aLights[i].coors.y;
+					float dot = dx*aLights[i].dir.x + dy*aLights[i].dir.y;
+					float distsq = sq(dx) + sq(dy);
+					float linedistsq = distsq - sq(dot);
+					if(dot > 0.0f && dot < FOG_AREA_LENGTH && linedistsq < sq(FOG_AREA_WIDTH)){
+						CVector fogcoors(xi, yi, aLights[i].coors.z + 10.0f);
+						if(CWorld::ProcessVerticalLine(fogcoors, fogcoors.z - 20.0f,
+								point, entity, true, false, false, false, true, false, nil)){
+							// Now same check again in xyz
+							fogcoors.z = point.point.z + 1.3f;
+							// actually we don't have to recalculate x and y, but the game does it that way
+							dx = xi - aLights[i].coors.x;
+							dy = yi - aLights[i].coors.y;
+							float dz = fogcoors.z - aLights[i].coors.z;
+							dot = dx*aLights[i].dir.x + dy*aLights[i].dir.y + dz*aLights[i].dir.z;
+							distsq = sq(dx) + sq(dy) + sq(dz);
+							linedistsq = distsq - sq(dot);
+							if(dot > 0.0f && dot < FOG_AREA_LENGTH && linedistsq < sq(FOG_AREA_WIDTH)){
+								float intensity = 158.0f * fogginess;
+								// more intensity the smaller the angle
+								intensity *= dot/Sqrt(distsq);
+								// more intensity the closer to light source
+								intensity *= 1.0f - sq(dot/FOG_AREA_LENGTH);
+								// more intensity the closer to line
+								intensity *= 1.0f - sq(Sqrt(linedistsq) / FOG_AREA_WIDTH);
+
+								if(CSprite::CalcScreenCoors(fogcoors, &spriteCoors, &spritew, &spriteh, true)) {
+									float rotation = (CTimer::GetTimeInMilliseconds()&0x1FFF) * 2*3.14f / 0x2000;
+									float size = FogSizes[r>>1];
+									CSprite::RenderBufferedOneXLUSprite_Rotate_Aspect(spriteCoors.x, spriteCoors.y, spriteCoors.z,
+										spritew * size, spriteh * size,
+										aLights[i].red * intensity, aLights[i].green * intensity, aLights[i].blue * intensity,
+										intensity, 1/spriteCoors.z, rotation, 255);
+								}
+							}
+						}
+					}
+				}
+			}
+
+		}else if(aLights[i].type == LIGHT_POINT || aLights[i].type == LIGHT_FOGONLY || aLights[i].type == LIGHT_FOGONLY_ALWAYS){
+			float groundZ;
+			if(ProcessVerticalLineUsingCache(aLights[i].coors, &groundZ)){
+				xmin = aLights[i].coors.x - FOG_AREA_RADIUS;
+				ymin = aLights[i].coors.y - FOG_AREA_RADIUS;
+				xmax = aLights[i].coors.x + FOG_AREA_RADIUS;
+				ymax = aLights[i].coors.y + FOG_AREA_RADIUS;
+
+				for(xi = (int16)xmin - (int16)xmin % 2; xi <= (int16)xmax + 2; xi += 2){
+					for(yi = (int16)ymin - (int16)ymin % 2; yi <= (int16)ymax + 2; yi += 2){
+						// Some kind of pseudo random number?
+						int r = (xi ^ yi)>>1 & 0xF;
+						if((r & 1) == 0)
+							continue;
+
+						float dx = xi - aLights[i].coors.x;
+						float dy = yi - aLights[i].coors.y;
+						float lightdist = Sqrt(sq(dx) + sq(dy));
+						if(lightdist < FOG_AREA_RADIUS){
+							dx = xi - TheCamera.GetPosition().x;
+							dy = yi - TheCamera.GetPosition().y;
+							float camdist = Sqrt(sq(dx) + sq(dy));
+							if(camdist < MAX_DIST){
+								float intensity;
+								// distance fade
+								if(camdist < MAX_DIST/2)
+									intensity = 1.0f;
+								else
+									intensity = 1.0f - (camdist - MAX_DIST/2) / (MAX_DIST/2);
+								intensity *= 132.0f * fogginess;
+								// more intensity the closer to light source
+								intensity *= 1.0f - sq(lightdist / FOG_AREA_RADIUS);
+
+								CVector fogcoors(xi, yi, groundZ + 1.6f);
+								if(CSprite::CalcScreenCoors(fogcoors, &spriteCoors, &spritew, &spriteh, true)) {
+									float rotation = (CTimer::GetTimeInMilliseconds()&0x3FFF) * 2*3.14f / 0x4000;
+									float size = FogSizes[r>>1];
+									CSprite::RenderBufferedOneXLUSprite_Rotate_Aspect(spriteCoors.x, spriteCoors.y, spriteCoors.z,
+										spritew * size, spriteh * size,
+										aLights[i].red * intensity, aLights[i].green * intensity, aLights[i].blue * intensity,
+										intensity, 1/spriteCoors.z, rotation, 255);
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	CSprite::FlushSpriteBuffer();
+
+	POP_RENDERGROUP();
+}
+
+bool
+CPointLights::ProcessVerticalLineUsingCache(CVector coors, float *groundZ)
+{
+	for(int i = 0; i < ARRAY_SIZE(aCachedMapReads); i++)
+		if(aCachedMapReads[i] == coors){
+			*groundZ = aCachedMapReadResults[i];
+			return true;
+		}
+
+	CColPoint point;
+	CEntity *entity;
+	if(CWorld::ProcessVerticalLine(coors, coors.z - 20.0f, point, entity, true, false, false, false, true, false, nil)){
+		aCachedMapReads[NextCachedValue] = coors;
+		aCachedMapReadResults[NextCachedValue] = point.point.z;
+		NextCachedValue = (NextCachedValue+1) % ARRAY_SIZE(aCachedMapReads);
+		*groundZ = point.point.z;
+		return true;
+	}
+	return false;
+}