Cleanups and fixes to AfterEffect

- fully uses RenderGrid now, no more immediate mode
- remove RippleEffect because it was unused
- Don't render the grid if no effects are active. Sames some GPU time.
- Fix ShockEffect math, broken 2 commits ago

BBGE/AfterEffect.cpp

@@ -35,7 +35,6 @@ AfterEffectManager::AfterEffectManager(int xDivs, int yDivs)
 {
 	active = false;
 	numEffects = 0;
-	bRenderGridPoints = true;
 	shaderPipeline.resize(10, 0);
 
 	this->xDivs = xDivs;
@@ -105,10 +104,15 @@ void AfterEffectManager::update(float dt)
 {
 	if (core->particlesPaused) return;
 
+	const size_t N = effects.size();
+
+	if(!N && !active)
+		return;
+
 	resetGrid();
 
 	bool isactive = false;
-	for (size_t i = 0; i < effects.size(); i++)
+	for (size_t i = 0; i < N; i++)
 	{
 		Effect *e = effects[i];
 		if (e)
@@ -132,20 +136,7 @@ void AfterEffectManager::update(float dt)
 
 void AfterEffectManager::resetGrid()
 {
-	Array2d<Vector>& a = grid.array2d();
-	const float mx = 1.0f / (float)(xDivs-1);
-	const float my = 1.0f / (float)(yDivs-1);
-	for (int y = 0; y < yDivs; y++)
-	{
-		Vector *row = a.row(y);
-		const float yy = y * my;
-		for (int x = 0; x < xDivs; x++)
-		{
-			row[x].x = x*mx;
-			row[x].y = yy;
-		}
-	}
-	grid.needVBOUpdate = true;
+	grid.reset01();
 }
 
 void AfterEffectManager::destroyEffect(int id)
@@ -212,7 +203,13 @@ void AfterEffectManager::renderGrid(const RenderState& rs) const
 	glTranslatef(offx, offy, 0);
 	glScalef(vw, vh, 1);
 
-	grid.render(rs);
+	if(active)
+	{
+		grid.render(rs);
+		//renderGridPoints(rs);
+	}
+	else
+		blitQuad.render(rs);
 
 	if (activeShader)
 		activeShader->unbind();
@@ -246,19 +243,7 @@ void AfterEffectManager::renderGrid(const RenderState& rs) const
 			activeShader->bind();
 			activeShader->setInt("tex", 0);
 
-			//blitQuad.render(rs);
-
-			// note that offx, offy are negative here!
-			glBegin(GL_QUADS);
-				glTexCoord2f(0.0f, 0.0f);
-				glVertex3f(offx, vh+offy,  0.0f);
-				glTexCoord2f(percentX, 0.0f);
-				glVertex3f( vw+offx, vh+offy,  0.0f);
-				glTexCoord2f(percentX, percentY);
-				glVertex3f( vw+offx,  offy,  0.0f);
-				glTexCoord2f(0.0f, percentY);
-				glVertex3f(offx,  offy,  0.0f);
-			glEnd();
+			blitQuad.render(rs);
 
 			activeShader->unbind();
 		}
@@ -266,9 +251,6 @@ void AfterEffectManager::renderGrid(const RenderState& rs) const
 
 	RenderObject::lastTextureApplied = 0;
 	glBindTexture(GL_TEXTURE_2D, 0);
-
-	//if (bRenderGridPoints)
-	renderGridPoints(rs);
 }
 
 void AfterEffectManager::renderGridPoints(const RenderState& rs) const
@@ -280,6 +262,7 @@ void AfterEffectManager::unloadDevice()
 {
 	backupBuffer.unloadDevice();
 	grid.dropBuffers();
+	blitQuad.dropBuffers();
 	unloadShaders();
 }
 
@@ -372,7 +355,7 @@ void ShockEffect::update(float dt, Array2d<Vector>& grid, int xDivs, int yDivs)
 	const float adjWaveLength = waveLength/distFromCamp;
 	const float adjAmplitude = amplitude/distFromCamp;
 
-	const float m = -1.0f / (adjWaveLength+currentDistance);
+	const float invAdjVaveLen = -1.0f / adjWaveLength;
 	const float dist = currentDistance*adjWaveLength;
 
 	if (amplitude < 0)
@@ -383,14 +366,14 @@ void ShockEffect::update(float dt, Array2d<Vector>& grid, int xDivs, int yDivs)
 		Vector *row = grid.row(y);
 		for (int x = 1; x < (xDivs-1); x++)
 		{
-			float xDist = (centerPoint.x - row[x].x)/.75f;
+			float xDist = (centerPoint.x - row[x].x)/.75f; // factor for 4:3 internal resolution
 			float yDist = centerPoint.y - row[x].y;
 
 			float tDist = sqrtf(xDist*xDist+yDist*yDist);
 
 			if (tDist < dist)
 			{
-				const float a = tDist * m;
+				const float a = tDist * invAdjVaveLen + currentDistance;
 				row[x].x += adjAmplitude*sinf(a)*.75f;
 				row[x].y += adjAmplitude*cosf(a);
 			}
@@ -398,35 +381,6 @@ void ShockEffect::update(float dt, Array2d<Vector>& grid, int xDivs, int yDivs)
 	}
 }
 
-
-RippleEffect::RippleEffect() : Effect()
-{
-	time = 0;
-}
-
-void RippleEffect::update(float dt, Array2d<Vector>& grid, int xDivs, int yDivs)
-{
-	const float offx = (core->screenCenter.x/float(core->width)/2);
-	const float offy = (core->screenCenter.y/float(core->height)/2);
-	const float invx = 1.0f / float(xDivs);
-	time += dt*0.5f;
-	float amp = 0.002f;
-
-	for (int y = 0; y < (yDivs-1); y++)
-	{
-		float offbase = y*invx + offx + offy;
-		Vector *row = grid.row(y);
-		for (int x = 0; x < (xDivs-1); x++)
-		{
-			float offset = x*invx + offbase;
-			float a = (time+offset)*7.5f;
-
-			row[x].x += sinf(a)*(amp*0.5f);
-			row[x].y += cosf(a)*amp;
-		}
-	}
-}
-
 int AfterEffectManager::loadShaderFile(const char *vert, const char *frag)
 {
 	Shader *sh = new Shader();
@@ -495,6 +449,8 @@ void AfterEffectManager::_initGrid()
 		grid.dropBuffers();
 
 	blitQuad.init(2, 2);
+	blitQuad.reset01();
+	blitQuad.updateVBO(); // never changed afterwards
 }
 
 void AfterEffectManager::deleteShader(int handle)

BBGE/AfterEffect.h

@@ -66,14 +66,6 @@ public:
 	float currentDistance;
 };
 
-class RippleEffect : public Effect
-{
-public:
-	RippleEffect();
-	void update(float dt, Array2d<Vector>& grid, int xDivs, int yDivs) OVERRIDE;
-	float time;
-};
-
 class AfterEffectManager
 {
 public:
@@ -100,20 +92,6 @@ public:
 	void reloadDevice();
 	void updateDevice();
 
-	std::vector<Effect*> effects;
-	std::vector<int> openSpots;
-
-	bool active;
-
-	bool bRenderGridPoints;
-
-	int numEffects;
-	int xDivs, yDivs;
-	int screenWidth, screenHeight;
-	int textureWidth, textureHeight;
-
-	RenderGrid grid, blitQuad;
-
 	// returns handle > 0 on success
 	int loadShaderFile(const char *vert, const char *frag);
 	int loadShaderSrc(const char *vert, const char *frag);
@@ -127,6 +105,14 @@ protected:
 	int _insertShader(Shader *sh);
 	void _initGrid();
 
+	RenderGrid grid, blitQuad;
+	bool active;
+	int numEffects;
+	int xDivs, yDivs;
+	int screenWidth, screenHeight;
+	int textureWidth, textureHeight;
+	std::vector<Effect*> effects;
+	std::vector<int> openSpots;
 	std::vector<Shader*> shaderPipeline; // Shaders are applied in this order. Can contain the same pointer more than once.
 	std::vector<Shader*> loadedShaders;
 	FrameBuffer backupBuffer;

BBGE/RenderGrid.cpp

@@ -3,7 +3,7 @@
 #include "RenderState.h"
 
 
-static void ResetGrid(Vector* dst, size_t w, size_t h)
+static void ResetGridZeroCenter(Vector* dst, size_t w, size_t h)
 {
 	assert(w > 1 && h > 1);
 	const float xMulF = 1.0f / (float)(w-1);
@@ -21,6 +21,25 @@ static void ResetGrid(Vector* dst, size_t w, size_t h)
 	}
 }
 
+static void ResetGrid01(Vector* dst, size_t w, size_t h)
+{
+	assert(w > 1 && h > 1);
+	const float xMulF = 1.0f / (float)(w-1);
+	const float yMulF = 1.0f / (float)(h-1);
+
+	for (size_t y = 0; y < h; y++)
+	{
+		const float yval = float(y)*yMulF;
+		for (size_t x = 0; x < w; x++)
+		{
+			dst->x = float(x)*xMulF;
+			dst->y = yval;
+			++dst;
+		}
+	}
+}
+
+
 void RenderGrid::ResetWithAlpha(Vector* dst, size_t w, size_t h, float alpha)
 {
 	assert(w > 1 && h > 1);
@@ -77,10 +96,16 @@ void RenderGrid::init(size_t w, size_t h, const TexCoordBox& tc)
 	this->init(w, h);
 }
 
+void RenderGrid::reset01()
+{
+	ResetGrid01(grid.data(), grid.width(), grid.height());
+	needVBOUpdate = true;
+}
+
 
 void RenderGrid::reset()
 {
-	ResetGrid(grid.data(), grid.width(), grid.height());
+	ResetGridZeroCenter(grid.data(), grid.width(), grid.height());
 	needVBOUpdate = true;
 }
 

BBGE/RenderGrid.h

@@ -35,6 +35,7 @@ public:
 
 	void init(size_t w, size_t h);
 	void init(size_t w, size_t h, const TexCoordBox& tc);
+	void reset01();
 	void reset();
 	void resetWithAlpha(float a);
 	void render(const RenderState& rs) const;