Implement DrawGraph.BrightDestOnly

include/gfx/gfx.h

@@ -137,6 +137,7 @@ void gfx_screen_da_daxsa(Texture *dst, int dx, int dy, Texture *src, int sx, int
 void gfx_add_da_daxsa(struct texture *dst, int dx, int dy, struct texture *src, int sx, int sy, int w, int h);
 void gfx_blend_da_daxsa(struct texture *dst, int dx, int dy, struct texture *src, int sx, int sy, int w, int h);
 void gfx_sub_da_daxsa(struct texture *dst, int dx, int dy, struct texture *src, int sx, int sy, int w, int h);
+void gfx_bright_dest_only(Texture *dst, int x, int y, int w, int h, int rate);
 void gfx_copy_stretch(struct texture *dst, int dx, int dy, int dw, int dh, struct texture *src, int sx, int sy, int sw, int sh);
 void gfx_copy_stretch_amap(struct texture *dst, int dx, int dy, int dw, int dh, struct texture *src, int sx, int sy, int sw, int sh);
 void gfx_copy_stretch_blend(struct texture *dst, int dx, int dy, int dw, int dh, struct texture *src, int sx, int sy, int sw, int sh, int a);

src/draw.c

@@ -650,6 +650,18 @@ void gfx_sub_da_daxsa(struct texture *dst, int dx, int dy, struct texture *src,
 	restore_blend_mode();
 }
 
+void gfx_bright_dest_only(Texture *dst, int x, int y, int w, int h, int rate)
+{
+	GLfloat f_rate = rate / 255.0;
+	glBlendFuncSeparate(GL_ZERO, GL_CONSTANT_COLOR, GL_ZERO, GL_ONE);
+	glBlendColor(f_rate, f_rate, f_rate, 1.0);
+
+	struct copy_data data = COPY_DATA(x, y, 0, 0, w, h);
+	run_copy_shader(&copy_shader.s, dst, NULL, &data);
+
+	restore_blend_mode();
+}
+
 // FIXME: DrawGraph.dll does some really strange clipping on the src/dst rectangles
 //        before drawing. This implementation does what you would normally expect
 //        a stretch function to do when passed negative (x,y) coordinates.

src/hll/DrawGraph.c

@@ -221,7 +221,11 @@ static void DrawGraph_SubDA_DAxSA(int dst, int dx, int dy, int src, int sx, int
 	gfx_sub_da_daxsa(DTEX(dst), dx, dy, STEX(src), sx, sy, w, h);
 }
 
-//void DrawGraph_BrightDestOnly(int dst, int x, int y, int w, int h, int rate);
+static void DrawGraph_BrightDestOnly(int dst, int x, int y, int w, int h, int rate)
+{
+	gfx_bright_dest_only(DTEX(dst), x, y, w, h, rate);
+}
+
 //void DrawGraph_CopyTextureWrap(int dst, int dx, int dy, int dw, int dh, int src, int sx, int sy, int sw, int sh, int u, int v);
 //void DrawGraph_CopyTextureWrapAlpha(int dst, int dx, int dy, int dw, int dh, int src, int sx, int sy, int sw, int sh, int u, int v, int alpha);
 
@@ -433,7 +437,7 @@ HLL_LIBRARY(DrawGraph,
 	    HLL_EXPORT(SpriteCopyAMap, DrawGraph_SpriteCopyAMap),
 	    HLL_EXPORT(BlendDA_DAxSA, DrawGraph_BlendDA_DAxSA),
 	    HLL_EXPORT(SubDA_DAxSA, DrawGraph_SubDA_DAxSA),
-	    //HLL_EXPORT(BrightDestOnly, DrawGraph_BrightDestOnly),
+	    HLL_EXPORT(BrightDestOnly, DrawGraph_BrightDestOnly),
 	    //HLL_EXPORT(CopyTextureWrap, DrawGraph_CopyTextureWrap),
 	    //HLL_EXPORT(CopyTextureWrapAlpha, DrawGraph_CopyTextureWrapAlpha),
 	    HLL_EXPORT(CopyStretch, DrawGraph_CopyStretch),