Implement burn.fp and second texture binding

src/rendering/polyrenderer/backend/poly_renderstate.cpp

@@ -233,7 +233,17 @@ void PolyRenderState::ApplyMaterial()
 		if (base)
 		{
 			DCanvas *texcanvas = base->GetImage(mMaterial);
-			PolyTriangleDrawer::SetTexture(GetPolyFrameBuffer()->GetDrawCommands(), texcanvas->GetPixels(), texcanvas->GetHeight(), texcanvas->GetWidth());
+			PolyTriangleDrawer::SetTexture(GetPolyFrameBuffer()->GetDrawCommands(), 0, texcanvas->GetPixels(), texcanvas->GetHeight(), texcanvas->GetWidth());
+
+			int numLayers = mMaterial.mMaterial->GetLayers();
+			for (int i = 1; i < numLayers; i++)
+			{
+				FTexture* layer;
+				auto systex = static_cast<PolyHardwareTexture*>(mMaterial.mMaterial->GetLayer(i, 0, &layer));
+
+				texcanvas = systex->GetImage(mMaterial);
+				PolyTriangleDrawer::SetTexture(GetPolyFrameBuffer()->GetDrawCommands(), i, texcanvas->GetPixels(), texcanvas->GetHeight(), texcanvas->GetWidth());
+			}
 		}
 
 		mMaterial.mChanged = false;

src/rendering/polyrenderer/drawers/poly_draw_args.cpp

@@ -59,6 +59,13 @@ void PolyDrawArgs::SetTexture(FSoftwareTexture *texture, FRenderStyle style)
 	mTranslation = nullptr;
 }
 
+void PolyDrawArgs::SetTexture2(const uint8_t* texels, int width, int height)
+{
+	mTexture2Pixels = texels;
+	mTexture2Width = width;
+	mTexture2Height = height;
+}
+
 void PolyDrawArgs::SetTexture(FSoftwareTexture *texture, uint32_t translationID, FRenderStyle style)
 {
 	// Alphatexture overrides translations.

src/rendering/polyrenderer/drawers/poly_draw_args.h

@@ -71,6 +71,7 @@ class PolyDrawArgs
 	void SetTexture(const uint8_t *texels, int width, int height);
 	void SetTexture(FSoftwareTexture *texture, FRenderStyle style);
 	void SetTexture(FSoftwareTexture *texture, uint32_t translationID, FRenderStyle style);
+	void SetTexture2(const uint8_t* texels, int width, int height);
 	void SetLight(FSWColormap *basecolormap, uint32_t lightlevel, double globVis, bool fixed);
 	void SetNoColormap() { mLight = 255; mFixedLight = true; mLightRed = 256; mLightGreen = 256; mLightBlue = 256; mLightAlpha = 256; mFadeRed = 0; mFadeGreen = 0; mFadeBlue = 0; mFadeAlpha = 0; mDesaturate = 0; mSimpleShade = true; mColormaps = nullptr; }
 	void SetDepthTest(bool enable) { mDepthTest = enable; }
@@ -95,6 +96,10 @@ class PolyDrawArgs
 	int TextureHeight() const { return mTextureHeight; }
 	const uint8_t *Translation() const { return mTranslation; }
 
+	const uint8_t* Texture2Pixels() const { return mTexture2Pixels; }
+	int Texture2Width() const { return mTexture2Width; }
+	int Texture2Height() const { return mTexture2Height; }
+
 	bool WriteStencil() const { return mWriteStencil; }
 	bool StencilTest() const { return mStencilTest; }
 	uint8_t StencilTestValue() const { return mStencilTestValue; }
@@ -142,6 +147,9 @@ class PolyDrawArgs
 	int mTextureWidth = 0;
 	int mTextureHeight = 0;
 	const uint8_t *mTranslation = nullptr;
+	const uint8_t* mTexture2Pixels = nullptr;
+	int mTexture2Width = 0;
+	int mTexture2Height = 0;
 	uint8_t mStencilTestValue = 0;
 	uint8_t mStencilWriteValue = 0;
 	const uint8_t *mColormaps = nullptr;

src/rendering/polyrenderer/drawers/poly_triangle.cpp

@@ -183,9 +183,9 @@ void PolyTriangleDrawer::SetRenderStyle(const DrawerCommandQueuePtr &queue, FRen
 	queue->Push<PolySetRenderStyleCommand>(style);
 }
 
-void PolyTriangleDrawer::SetTexture(const DrawerCommandQueuePtr &queue, void *pixels, int width, int height)
+void PolyTriangleDrawer::SetTexture(const DrawerCommandQueuePtr &queue, int unit, void *pixels, int width, int height)
 {
-	queue->Push<PolySetTextureCommand>(pixels, width, height);
+	queue->Push<PolySetTextureCommand>(unit, pixels, width, height);
 }
 
 void PolyTriangleDrawer::SetShader(const DrawerCommandQueuePtr &queue, int specialEffect, int effectState, bool alphaTest)
@@ -446,9 +446,12 @@ void PolyTriangleThreadData::SetShader(int specialEffect, int effectState, bool
 	AlphaTest = alphaTest;
 }
 
-void PolyTriangleThreadData::SetTexture(void *pixels, int width, int height)
+void PolyTriangleThreadData::SetTexture(int unit, void *pixels, int width, int height)
 {
-	drawargs.SetTexture((uint8_t*)pixels, width, height);
+	if (unit == 0)
+		drawargs.SetTexture((uint8_t*)pixels, width, height);
+	else if (unit == 1)
+		drawargs.SetTexture2((uint8_t*)pixels, width, height);
 }
 
 void PolyTriangleThreadData::DrawIndexed(int index, int vcount, PolyDrawMode drawmode)

src/rendering/polyrenderer/drawers/poly_triangle.h

@@ -57,7 +57,7 @@ class PolyTriangleDrawer
 	static void SetScissor(const DrawerCommandQueuePtr &queue, int x, int y, int w, int h);
 	static void EnableDepthTest(const DrawerCommandQueuePtr &queue, bool on);
 	static void SetRenderStyle(const DrawerCommandQueuePtr &queue, FRenderStyle style);
-	static void SetTexture(const DrawerCommandQueuePtr &queue, void *pixels, int width, int height);
+	static void SetTexture(const DrawerCommandQueuePtr &queue, int unit, void *pixels, int width, int height);
 	static void SetShader(const DrawerCommandQueuePtr &queue, int specialEffect, int effectState, bool alphaTest);
 	static void PushStreamData(const DrawerCommandQueuePtr &queue, const StreamData &data, const PolyPushConstants &constants);
 	static void PushMatrices(const DrawerCommandQueuePtr &queue, const VSMatrix &modelMatrix, const VSMatrix &normalModelMatrix, const VSMatrix &textureMatrix);
@@ -159,7 +159,7 @@ class PolyTriangleThreadData
 	void SetScissor(int x, int y, int w, int h);
 	void EnableDepthTest(bool on);
 	void SetRenderStyle(FRenderStyle style);
-	void SetTexture(void *pixels, int width, int height);
+	void SetTexture(int unit, void *pixels, int width, int height);
 	void SetShader(int specialEffect, int effectState, bool alphaTest);
 
 	void UpdateClip();
@@ -423,10 +423,11 @@ class PolySetRenderStyleCommand : public PolyDrawerCommand
 class PolySetTextureCommand : public PolyDrawerCommand
 {
 public:
-	PolySetTextureCommand(void *pixels, int width, int height) : pixels(pixels), width(width), height(height) { }
-	void Execute(DrawerThread *thread) override { PolyTriangleThreadData::Get(thread)->SetTexture(pixels, width, height); }
+	PolySetTextureCommand(int unit, void *pixels, int width, int height) : unit(unit), pixels(pixels), width(width), height(height) { }
+	void Execute(DrawerThread *thread) override { PolyTriangleThreadData::Get(thread)->SetTexture(unit, pixels, width, height); }
 
 private:
+	int unit;
 	void *pixels;
 	int width;
 	int height;

src/rendering/polyrenderer/drawers/screen_triangle.cpp

@@ -375,10 +375,35 @@ static void RunShader(int x0, int x1, PolyTriangleThreadData* thread)
 	}
 	else if (thread->SpecialEffect == EFF_BURN) // burn.fp
 	{
-		/*vec4 frag = vColor;
-		vec4 t1 = texture(tex, vTexCoord.xy);
-		vec4 t2 = texture(texture2, vec2(vTexCoord.x, 1.0-vTexCoord.y));
-		FragColor = frag * vec4(t1.rgb, t2.a);*/
+		int texWidth = thread->drawargs.TextureWidth();
+		int texHeight = thread->drawargs.TextureHeight();
+		const uint32_t* texPixels = (const uint32_t*)thread->drawargs.TexturePixels();
+
+		int tex2Width = thread->drawargs.Texture2Width();
+		int tex2Height = thread->drawargs.Texture2Height();
+		const uint32_t* tex2Pixels = (const uint32_t*)thread->drawargs.Texture2Pixels();
+
+		uint32_t frag = thread->mainVertexShader.vColor;
+		uint32_t frag_r = RPART(frag);
+		uint32_t frag_g = GPART(frag);
+		uint32_t frag_b = BPART(frag);
+		uint32_t frag_a = APART(frag);
+		frag_r += frag_r >> 7; // 255 -> 256
+		frag_g += frag_g >> 7; // 255 -> 256
+		frag_b += frag_b >> 7; // 255 -> 256
+		frag_a += frag_a >> 7; // 255 -> 256
+		for (int x = x0; x < x1; x++)
+		{
+			uint32_t t1 = sampleTexture(u[x], v[x], texPixels, texWidth, texHeight);
+			uint32_t t2 = sampleTexture(u[x], 1.0f - v[x], tex2Pixels, tex2Width, tex2Height);
+
+			uint32_t r = (frag_r * RPART(t1)) >> 8;
+			uint32_t g = (frag_g * GPART(t1)) >> 8;
+			uint32_t b = (frag_b * BPART(t1)) >> 8;
+			uint32_t a = (frag_a * APART(t2)) >> 8;
+
+			fragcolor[x] = MAKEARGB(a, r, g, b);
+		}
 		return;
 	}
 	else if (thread->SpecialEffect == EFF_STENCIL) // stencil.fp