- Add "fuzz software" to GL that renders fuzz like the scaled fuzz mode in the software renderer

src/gl/renderer/gl_renderstate.cpp

@@ -177,6 +177,7 @@ bool FRenderState::ApplyShader()
 	activeShader->muAlphaThreshold.Set(mAlphaThreshold);
 	activeShader->muLightIndex.Set(mLightIndex);	// will always be -1 for now
 	activeShader->muClipSplit.Set(mClipSplit);
+	activeShader->muViewHeight.Set(viewheight);
 
 	if (mGlowEnabled)
 	{

src/gl/scene/gl_sprite.cpp

@@ -73,7 +73,7 @@ CVAR(Bool, gl_billboard_particles, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 CVAR(Int, gl_enhanced_nv_stealth, 3, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 CUSTOM_CVAR(Int, gl_fuzztype, 0, CVAR_ARCHIVE)
 {
-	if (self < 0 || self > 7) self = 0;
+	if (self < 0 || self > 8) self = 0;
 }
 
 EXTERN_CVAR (Float, transsouls)

src/gl/shaders/gl_shader.cpp

@@ -254,6 +254,7 @@ bool FShader::Load(const char * name, const char * vert_prog_lump, const char *
 	muClipHeight.Init(hShader, "uClipHeight");
 	muClipHeightDirection.Init(hShader, "uClipHeightDirection");
 	muAlphaThreshold.Init(hShader, "uAlphaThreshold");
+	muViewHeight.Init(hShader, "uViewHeight");
 	muTimer.Init(hShader, "timer");
 
 	lights_index = glGetUniformLocation(hShader, "lights");
@@ -392,6 +393,7 @@ static const FDefaultShader defaultshaders[]=
 	{"Jagged Fuzz", "shaders/glsl/fuzz_jagged.fp"},
 	{"Noise Fuzz", "shaders/glsl/fuzz_noise.fp"},
 	{"Smooth Noise Fuzz", "shaders/glsl/fuzz_smoothnoise.fp"},
+	{"Software Fuzz", "shaders/glsl/fuzz_software.fp"},
 	{NULL,NULL}
 };
 

src/gl/shaders/gl_shader.h

@@ -284,6 +284,7 @@ class FShader
 	FBufferedUniform1f muClipHeight;
 	FBufferedUniform1f muClipHeightDirection;
 	FBufferedUniform1f muAlphaThreshold;
+	FBufferedUniform1i muViewHeight;
 	FBufferedUniform1f muTimer;
 	
 	int lights_index;
@@ -397,7 +398,7 @@ public:
 	}
 };
 
-#define FIRST_USER_SHADER 12
+#define FIRST_USER_SHADER 13
 
 enum
 {

wadsrc/static/menudef.txt

@@ -2111,6 +2111,7 @@ OptionValue "FuzzStyle"
 	4, "$OPTVAL_TRANSLUCENTFUZZ"
 	6, "$OPTVAL_NOISE"
 	7, "$OPTVAL_SMOOTHNOISE"
+	8, "$OPTVAL_SOFTWARE"
 	//5, "$OPTVAL_JAGGEDFUZZ" I can't see any difference between this and 4 so it's disabled for now.
 }
 

wadsrc/static/shaders/glsl/fuzz_software.fp

@@ -0,0 +1,52 @@
+// Fuzz effect as rendered by the software renderer
+uniform float timer;
+
+#define FUZZTABLE 50
+#define FUZZ_RANDOM_X_SIZE 100
+#define FRACBITS 16
+#define fixed_t int
+
+int fuzz_random_x_offset[FUZZ_RANDOM_X_SIZE] =
+{
+	75, 76, 21, 91, 56, 33, 62, 99, 61, 79,
+	95, 54, 41, 18, 69, 43, 49, 59, 10, 84,
+	94, 17, 57, 46,  9, 39, 55, 34,100, 81,
+	73, 88, 92,  3, 63, 36,  7, 28, 13, 80,
+	16, 96, 78, 29, 71, 58, 89, 24,  1, 35,
+	52, 82,  4, 14, 22, 53, 38, 66, 12, 72,
+	90, 44, 77, 83,  6, 27, 48, 30, 42, 32,
+	65, 15, 97, 20, 67, 74, 98, 85, 60, 68,
+	19, 26,  8, 87, 86, 64, 11, 37, 31, 47,
+	25,  5, 50, 51, 23,  2, 93, 70, 40, 45
+};
+
+int fuzzoffset[FUZZTABLE] =
+{
+	 6, 11,  6, 11,  6,  6, 11,  6,  6, 11,
+	 6,  6,  6, 11,  6,  6,  6, 11, 15, 18,
+	21,  6, 11, 15,  6,  6,  6,  6, 11, 6,
+	11,  6,  6, 11, 15,  6,  6, 11, 15, 18,
+	21,  6,  6,  6,  6, 11,  6,  6, 11, 6
+};
+
+vec4 ProcessTexel()
+{
+	vec2 texCoord = vTexCoord.st;
+	vec4 basicColor = getTexel(texCoord);
+
+	// Ideally fuzzpos would be an uniform and differ from each sprite so that overlapping demons won't get the same shade for the same pixel
+	int next_random = int(abs(mod(timer * 35.0, float(FUZZ_RANDOM_X_SIZE))));
+	int fuzzpos = (/*fuzzpos +*/ fuzz_random_x_offset[next_random] * FUZZTABLE / 100) % FUZZTABLE;
+
+	int x = int(gl_FragCoord.x);
+	int y = int(gl_FragCoord.y);
+
+	fixed_t fuzzscale = (200 << FRACBITS) / uViewHeight;
+	int scaled_x = (x * fuzzscale) >> FRACBITS;
+	int fuzz_x = fuzz_random_x_offset[scaled_x % FUZZ_RANDOM_X_SIZE] + fuzzpos;
+	fixed_t fuzzcount = FUZZTABLE << FRACBITS;
+	fixed_t fuzz = ((fuzz_x << FRACBITS) + y * fuzzscale) % fuzzcount;
+	float alpha = float(fuzzoffset[fuzz >> FRACBITS]) / 32.0;
+
+	return vec4(0.0, 0.0, 0.0, basicColor.a * alpha);
+}

wadsrc/static/shaders/glsl/shaderdefs.i

@@ -48,6 +48,9 @@ uniform float uGlobVis; // uGlobVis = R_GetGlobVis(r_visibility) / 32.0
 // dynamic lights
 uniform int uLightIndex;
 
+// Software fuzz scaling
+uniform int uViewHeight;
+
 // quad drawer stuff
 #ifdef USE_QUAD_DRAWER
 uniform mat4 uQuadVertices;