Add config variable and support for Doom

Author: JNechaevsky

src/crispy.c

@@ -31,6 +31,7 @@ static crispy_t crispy_s = {
 #ifdef CRISPY_TRUECOLOR
 	.smoothlight = 1,
 	.truecolor = 1,
+    .blendquality = 1,
 #endif
 	.vsync = 1,
 	.widescreen = 1, // match screen by default

src/crispy.h

@@ -81,6 +81,7 @@ typedef struct
 	int translucency;
 #ifdef CRISPY_TRUECOLOR
 	int truecolor;
+    int blendquality;
 #endif
 	int uncapped;
 	int vsync;

src/doom/d_main.c

@@ -483,6 +483,7 @@ void D_BindVariables(void)
     M_BindIntVariable("crispy_translucency",    &crispy->translucency);
 #ifdef CRISPY_TRUECOLOR
     M_BindIntVariable("crispy_truecolor",       &crispy->truecolor);
+    M_BindIntVariable("crispy_blendquality",    &crispy->blendquality);
 #endif
     M_BindIntVariable("crispy_uncapped",        &crispy->uncapped);
     M_BindIntVariable("crispy_vsync",           &crispy->vsync);

src/doom/r_things.c

@@ -817,7 +817,7 @@ void R_ProjectSprite (mobj_t* thing)
     // [crispy] translucent sprites
     if (thing->flags & MF_TRANSLUCENT)
     {
-	vis->blendfunc = (thing->frame & FF_FULLBRIGHT) ? I_BlendAdd : I_BlendOverTranmap;
+	vis->blendfunc = (thing->frame & FF_FULLBRIGHT) ? I_BlendAddFunc : I_BlendOverTranmap;
     }
 #endif
 }

src/i_truecolor.c

@@ -42,6 +42,10 @@ static uint32_t blendAddLUT[512][512];      // Additive blending
 static uint32_t blendOverLUT[512][512];     // Overlay blending
 static uint32_t blendOverAltLUT[512][512];  // Overlay "alt" blending
 
+const uint32_t (*I_BlendAddFunc) (const uint32_t bg_i, const uint32_t fg_i);
+const uint32_t (*I_BlendOverFunc) (const uint32_t bg_i, const uint32_t fg_i, const int amount);
+//const uint32_t (*I_BlendOverAltFunc) (const uint32_t bg_i, const uint32_t fg_i);
+
 // [JN] Different blending alpha values for different games
 #define OVERLAY_ALPHA_TRANMAP     168  // Doom: TRANMAP, 66% opacity
 #define OVERLAY_ALPHA_TINTTAB     96   // Raven: TINTTAB, 38% opacity
@@ -176,7 +180,7 @@ const uint32_t I_BlendOverLow (const uint32_t bg_i, const uint32_t fg_i, const i
 // [crispy] TRANMAP blending emulation, used for Doom
 const uint32_t I_BlendOverTranmap (const uint32_t bg, const uint32_t fg)
 {
-    return I_BlendOver(bg, fg, 0xA8); // 168 (66% opacity)
+    return I_BlendOverFunc(bg, fg, 0xA8); // 168 (66% opacity)
 }
 
 // [crispy] TINTTAB blending emulation, used for Heretic and Hexen
@@ -203,4 +207,21 @@ const uint32_t I_BlendOverAltXlatab (const uint32_t bg, const uint32_t fg)
     return I_BlendOver(bg, fg, 0x40); // 64 (25% opacity)
 }
 
+// [JN] Set pointers to blending functions.
+void R_InitBlendQuality (void)
+{
+    if (crispy->blendquality)
+    {
+        I_BlendAddFunc = I_BlendAdd;
+        I_BlendOverFunc = I_BlendOver;
+        // I_BlendOverAltFunc = I_BlendOverAlt;
+    }
+    else
+    {
+        I_BlendAddFunc = I_BlendAddLow;
+        I_BlendOverFunc = I_BlendOverLow;
+        // I_BlendOverAltFunc = I_BlendOverAltLow;
+    }
+}
+
 #endif

src/i_truecolor.h

@@ -29,6 +29,9 @@
 extern const uint32_t (*blendfunc) (const uint32_t fg, const uint32_t bg);
 
 extern void R_InitBlendMaps (void);
+extern void R_InitBlendQuality (void);
+extern const uint32_t (*I_BlendAddFunc) (const uint32_t bg_i, const uint32_t fg_i);
+extern const uint32_t (*I_BlendOverFunc) (const uint32_t bg_i, const uint32_t fg_i, const int amount);
 
 const uint32_t I_BlendAdd (const uint32_t bg_i, const uint32_t fg_i);
 const uint32_t I_BlendDark (const uint32_t bg_i, const int d);

src/m_config.c

@@ -2606,6 +2606,14 @@ static default_t extra_defaults_list[] =
     //
 
     CONFIG_VARIABLE_INT(crispy_truecolor),
+
+    //!
+    // @game doom
+    //
+    // Quality of translucency blending.
+    //
+
+    CONFIG_VARIABLE_INT(crispy_blendquality),
 #endif
 
     //!

src/setup/compatibility.c

@@ -91,6 +91,7 @@ void BindCompatibilityVariables(void)
         M_BindIntVariable("crispy_translucency",    &crispy->translucency);
 #ifdef CRISPY_TRUECOLOR
         M_BindIntVariable("crispy_truecolor",       &crispy->truecolor);
+        M_BindIntVariable("crispy_blendquality",    &crispy->blendquality);
 #endif
         M_BindIntVariable("crispy_uncapped",        &crispy->uncapped);
         M_BindIntVariable("crispy_vsync",           &crispy->vsync);