diff --git a/include/sact.h b/include/sact.h
index f372b4d..90a1754 100644
--- a/include/sact.h
+++ b/include/sact.h
@@ -91,6 +91,8 @@ int sact_SP_IsPtInRect(int sp_no, int x, int y);
 int sact_CG_GetMetrics(int cg_no, struct page **page);
 int sact_SP_GetAMapValue(int sp_no, int x, int y);
 int sact_SP_GetPixelValue(int sp_no, int x, int y, int *r, int *g, int *b);
+int sact_SP_SetBrightness(int sp_no, int brightness);
+int sact_SP_GetBrightness(int sp_no);
 int sact_GAME_MSG_GetNumOf(void);
 void sact_IntToZenkaku(struct string **s, int value, int figures, int zero_pad);
 void sact_IntToHankaku(struct string **s, int value, int figures, int zero_pad);
diff --git a/include/sprite.h b/include/sprite.h
index 4cdc652..675368d 100644
--- a/include/sprite.h
+++ b/include/sprite.h
@@ -68,7 +68,7 @@ struct sact_sprite {
 
 /*
  * XXX: There are two different sprite renderers:
- *        * SACT2 - only shader param is blend rate
+ *        * SACT2 - blend rate and brightness (stored in multiply_color field)
  *        * ChipmunkSpriteEngine - blend rate, add color, multiply color, surface area
  *          (uses parts shader)
  *
diff --git a/shaders/sprite.f.glsl b/shaders/sprite.f.glsl
index bda1ac5..a78d27d 100644
--- a/shaders/sprite.f.glsl
+++ b/shaders/sprite.f.glsl
@@ -16,11 +16,13 @@
 
 uniform sampler2D tex;
 uniform float blend_rate;
+uniform vec3 multiply_color;
 
 in vec2 tex_coord;
 out vec4 frag_color;
 
 void main() {
-        frag_color = texture(tex, tex_coord);
+	frag_color = texture(tex, tex_coord);
+	frag_color.rgb *= multiply_color;
 	frag_color.a *= blend_rate;
 }
diff --git a/src/hll/SACT2.c b/src/hll/SACT2.c
index d721480..73532b6 100644
--- a/src/hll/SACT2.c
+++ b/src/hll/SACT2.c
@@ -841,16 +841,20 @@ void sact_CG_BlendAMapBin(int dst, int dx, int dy, int src, int sx, int sy, int
 //void SACT2_Debug_Pause(void);
 //void SACT2_Debug_GetFuncStack(struct string **s, int nest);
 
-int SACT2_SP_SetBrightness(int sp_no, int brightness)
+int sact_SP_SetBrightness(int sp_no, int brightness)
 {
-	if (brightness != 255)
-		WARNING("Unimplemented HLL function: SACT2.SP_SetBrightness(%d, %d)", sp_no, brightness);
+	struct sact_sprite *sp = sact_try_get_sprite(sp_no);
+	if (!sp) return 0;
+	sprite_set_multiply_color(sp, brightness, brightness, brightness);
+	sprite_dirty(sp);
 	return 1;
 }
 
-int SACT2_SP_GetBrightness(int sp_no)
+int sact_SP_GetBrightness(int sp_no)
 {
-	return 255;
+	struct sact_sprite *sp = sact_try_get_sprite(sp_no);
+	if (!sp) return 0;
+	return sp->multiply_color.r;
 }
 
 #define SACT_EXPORTS \
@@ -994,8 +998,8 @@ int SACT2_SP_GetBrightness(int sp_no)
 	    HLL_TODO_EXPORT(Debug_GetFuncStack, SACT2_Debug_GetFuncStack), \
 	    HLL_EXPORT(SP_GetAMapValue, sact_SP_GetAMapValue), \
 	    HLL_EXPORT(SP_GetPixelValue, sact_SP_GetPixelValue), \
-	    HLL_EXPORT(SP_SetBrightness, SACT2_SP_SetBrightness), \
-	    HLL_EXPORT(SP_GetBrightness, SACT2_SP_GetBrightness)
+	    HLL_EXPORT(SP_SetBrightness, sact_SP_SetBrightness), \
+	    HLL_EXPORT(SP_GetBrightness, sact_SP_GetBrightness)
 
 HLL_WARN_UNIMPLEMENTED( , void, SACTDX, SetVolumeMixerMasterGroupNum, int n);
 HLL_WARN_UNIMPLEMENTED( , void, SACTDX, SetVolumeMixerSEGroupNum, int n);
diff --git a/src/hll/StoatSpriteEngine.c b/src/hll/StoatSpriteEngine.c
index e151cbf..d455621 100644
--- a/src/hll/StoatSpriteEngine.c
+++ b/src/hll/StoatSpriteEngine.c
@@ -41,8 +41,6 @@
 static bool fps_show = false;
 
 HLL_WARN_UNIMPLEMENTED( , void, StoatSpriteEngine, JoypadQuake_Set, int num, int type, int magnitude);
-HLL_WARN_UNIMPLEMENTED(0, int,  StoatSpriteEngine, SP_SetBrightness, int sp_no, int brightness);
-HLL_WARN_UNIMPLEMENTED(0, int,  StoatSpriteEngine, SP_GetBrightness, int sp_no);
 HLL_WARN_UNIMPLEMENTED( , void, StoatSpriteEngine, SetVolumeMixerMasterGroupNum, int n);
 HLL_WARN_UNIMPLEMENTED( , void, StoatSpriteEngine, SetVolumeMixerSEGroupNum, int n);
 HLL_WARN_UNIMPLEMENTED( , void, StoatSpriteEngine, SetVolumeMixerBGMGroupNum, int n);
@@ -1098,8 +1096,8 @@ HLL_LIBRARY(StoatSpriteEngine,
 	    HLL_TODO_EXPORT(Debug_GetFuncStack, SACT2_Debug_GetFuncStack),
 	    HLL_EXPORT(SP_GetAMapValue, sact_SP_GetAMapValue),
 	    HLL_EXPORT(SP_GetPixelValue, sact_SP_GetPixelValue),
-	    HLL_EXPORT(SP_SetBrightness, StoatSpriteEngine_SP_SetBrightness),
-	    HLL_EXPORT(SP_GetBrightness, StoatSpriteEngine_SP_GetBrightness),
+	    HLL_EXPORT(SP_SetBrightness, sact_SP_SetBrightness),
+	    HLL_EXPORT(SP_GetBrightness, sact_SP_GetBrightness),
 	    HLL_TODO_EXPORT(SP_CreateCopy, SACTDX_SP_CreateCopy),
 	    HLL_TODO_EXPORT(Joypad_GetAnalogStickStatus, SACTDX_Joypad_GetAnalogStickStatus),
 	    HLL_TODO_EXPORT(GetDigitalStickStatus, SACTDX_GetDigitalStickStatus),
diff --git a/src/sprite.c b/src/sprite.c
index c83dc90..b34e54e 100644
--- a/src/sprite.c
+++ b/src/sprite.c
@@ -88,6 +88,10 @@ static void prepare_sact_shader(struct gfx_render_job *job, void *data)
 	struct sprite_shader *s = (struct sprite_shader*)job->shader;
 	struct sact_sprite *sp = (struct sact_sprite*)data;
 	glUniform1f(s->blend_rate, sp->blend_rate / 255.0f);
+	glUniform3f(s->multiply_color,
+			sp->multiply_color.r / 255.0f,
+			sp->multiply_color.g / 255.0f,
+			sp->multiply_color.b / 255.0f);
 }
 
 static void prepare_chipmunk_shader(struct gfx_render_job *job, void *data)
@@ -123,6 +127,7 @@ void sprite_init_sact(void)
 	}
 	gfx_load_shader(&sprite_shader.s, "shaders/render.v.glsl", "shaders/sprite.f.glsl");
 	sprite_shader.blend_rate = glGetUniformLocation(sprite_shader.s.program, "blend_rate");
+	sprite_shader.multiply_color = glGetUniformLocation(sprite_shader.s.program, "multiply_color");
 	sprite_shader.s.prepare = prepare_sact_shader;
 
 }