RPLE compat

2 files changed, 45 insertions, 1 deletions

diff --git a/src/main/resources/shaders/chunk.frag b/src/main/resources/shaders/chunk.frag
index 03ae8e4..aadd55f 100644
--- a/src/main/resources/shaders/chunk.frag
+++ b/src/main/resources/shaders/chunk.frag
@@ -2,7 +2,13 @@
 out vec4 FragColor;
 
 in vec2 TexCoord;
+#ifdef RPLE
+in vec2 BTexCoordR;
+in vec2 BTexCoordG;
+in vec2 BTexCoordB;
+#else
 in vec2 BTexCoord;
+#endif
 in vec4 Color;
 in vec4 Viewport;
 in mat4 ProjInv;
@@ -11,7 +17,13 @@ in vec2 FogStartEnd;
 in float FogFactor;
 
 uniform sampler2D atlas;
+#ifdef RPLE
+uniform sampler2D lightTexR;
+uniform sampler2D lightTexG;
+uniform sampler2D lightTexB;
+#else
 uniform sampler2D lightTex;
+#endif
 
 void main()
 {
@@ -23,7 +35,21 @@ void main()
 	
 	vec4 colorMult = Color/256.0;
 	
-	vec4 lightyColor = texture(lightTex, (BTexCoord + 8.0) / 256.0);
+	vec4 lightyColor =
+#ifdef RPLE
+	// RPLE assumes that we're using the legacy opengl pipeline, so it creates 3 textures:
+	//  color dark       bright
+	//   RED: Cyan    -> White
+	// GREEN: Magenta -> White
+	//  BLUE: Yellow  -> White
+	// In each texture, only a single channel varies, while the other 2 are set to 1, so the result becomes:
+	// (r, 1, 1) * (1, g, 1) * (1, 1, b) = (r, g, b)
+	texture(lightTexR, (BTexCoordR + 32767) / 65535.0) *
+	texture(lightTexG, (BTexCoordG + 32767) / 65535.0) *
+	texture(lightTexB, (BTexCoordB + 32767) / 65535.0);
+#else
+	texture(lightTex, (BTexCoord + 8.0) / 256.0);
+#endif
 
 	vec4 rasterColor = 
 #ifdef PASS_0
diff --git a/src/main/resources/shaders/chunk.vert b/src/main/resources/shaders/chunk.vert
index 67ce114..9988605 100644
--- a/src/main/resources/shaders/chunk.vert
+++ b/src/main/resources/shaders/chunk.vert
@@ -1,7 +1,13 @@
 #version 330 core
 layout (location = ATTRIB_POS) in vec3 aPos;
 layout (location = ATTRIB_TEXTURE) in vec2 aTexCoord;
+#ifdef RPLE
+layout (location = ATTRIB_BRIGHTNESS_RED) in vec2 aBTexCoordR;
+layout (location = ATTRIB_BRIGHTNESS_GREEN) in vec2 aBTexCoordG;
+layout (location = ATTRIB_BRIGHTNESS_BLUE) in vec2 aBTexCoordB;
+#else
 layout (location = ATTRIB_BRIGHTNESS) in vec2 aBTexCoord;
+#endif
 layout (location = ATTRIB_COLOR) in vec4 aColor;
 
 uniform mat4 modelView;
@@ -16,7 +22,13 @@ uniform float fogDensity;
 uniform vec3 playerPos;
 
 out vec2 TexCoord;
+#ifdef RPLE
+out vec2 BTexCoordR;
+out vec2 BTexCoordG;
+out vec2 BTexCoordB;
+#else
 out vec2 BTexCoord;
+#endif
 out vec4 Color;
 out vec4 Viewport;
 out mat4 ProjInv;
@@ -28,7 +40,13 @@ void main()
 {
     gl_Position = proj * modelView * (vec4(aPos - playerPos, 1.0) + vec4(0, 0.12, 0, 0));
 	TexCoord = aTexCoord;
+#ifdef RPLE
+	BTexCoordR = aBTexCoordR;
+	BTexCoordG = aBTexCoordG;
+	BTexCoordB = aBTexCoordB;
+#else
 	BTexCoord = aBTexCoord;
+#endif
 	Color = aColor;
 	
 	Viewport = viewport;