move 3dfx shaders into their own subdir and port powervr2 shader

gpu/3dfx_4x1.slangp

@@ -1,10 +1,10 @@
 shaders = 6
-shader0 = shaders/3dfx_pass_0.slang
-shader1 = shaders/3dfx_pass_1.slang
-shader2 = shaders/3dfx_pass_1.slang
-shader3 = shaders/3dfx_pass_1.slang
-shader4 = shaders/3dfx_pass_1.slang
-shader5 = shaders/3dfx_pass_2.slang
+shader0 = shaders/3dfx/3dfx_pass_0.slang
+shader1 = shaders/3dfx/3dfx_pass_1.slang
+shader2 = shaders/3dfx/3dfx_pass_1.slang
+shader3 = shaders/3dfx/3dfx_pass_1.slang
+shader4 = shaders/3dfx/3dfx_pass_1.slang
+shader5 = shaders/3dfx/3dfx_pass_2.slang
 
 filter_linear0 = true
 filter_linear1 = true

gpu/powervr2.slangp

@@ -0,0 +1,3 @@
+shaders = 1
+
+shader0 = shaders/powervr2.slang

gpu/shaders/powervr2.slang

@@ -0,0 +1,167 @@
+#version 450
+
+/*
+	PowerVR2 buffer shader
+
+    Authors: leilei
+ 
+    This program is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2 of the License, or (at your option)
+    any later version.
+*/
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	uint FrameCount;
+   float INTERLACED, VGASIGNAL, LUMBOOST;
+} params;
+
+#pragma parameter INTERLACED "PVR - Interlace smoothing" 1.00 0.00 1.00 1.0
+#pragma parameter VGASIGNAL "PVR - VGA signal loss" 0.00 0.00 1.00 1.0
+#pragma parameter LUMBOOST "PVR - Luminance gain" 0.35 0.00 1.00 0.01
+
+#define INTERLACED params.INTERLACED
+#define VGASIGNAL params.VGASIGNAL
+#define LUMBOOST params.LUMBOOST
+
+#define HW 1.00
+
+#define LUM_R (76.0f/255.0f)
+#define LUM_G (150.0f/255.0f)
+#define LUM_B (28.0f/255.0f)
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+	mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+float dithertable[16] = {
+	16.,4.,13.,1.,   
+	8.,12.,5.,9.,
+	14.,2.,15.,3.,
+	6.,10.,7.,11.		
+};
+
+void main()
+{
+	float blue;
+	
+	vec2 texcoord  = vTexCoord;
+	vec2 texcoord2  = vTexCoord;
+	texcoord2.x *= params.SourceSize.x;
+	texcoord2.y *= params.SourceSize.y;
+	vec4 color = texture(Source, texcoord);
+	float fc = mod(float(params.FrameCount), 2.0);
+
+	// Blend vertically for composite mode
+	if (bool(INTERLACED))
+	{
+	int taps = int(8);
+	float tap = 0.62/taps;
+	vec2 texcoord4  = vTexCoord;
+	texcoord4.x = texcoord4.x;
+	texcoord4.y = texcoord4.y + ((tap*(taps/2))/480.0f);
+	vec4 blur1 = texture(Source, texcoord4);
+	int bl;
+	vec4 ble;
+
+	for (bl=0;bl<taps;bl++)
+		{
+			texcoord4.y += (tap  / 480.0f);
+			ble.rgb += texture(Source, texcoord4).rgb / taps;
+		}
+
+        	color.rgb = color.rgb * 0.25 + ( ble.rgb * 0.75);
+	}
+
+	// Some games use a luminance boost (JSR etc)
+	if (bool(LUMBOOST))
+	{
+		color.rgb += (((color.r * LUM_R) + (color.g * LUM_G) + (color.b * LUM_B)) * LUMBOOST);
+	}
+
+	// Dither. ALWAYS do this for 16bpp
+	int ditdex = 	int(mod(texcoord2.x, 4.0)) * 4 + int(mod(texcoord2.y, 4.0)); 	
+	int yeh = 0;
+	float ohyes;
+	vec4 how;
+
+	for (yeh=ditdex; yeh<(ditdex+16); yeh++) 	ohyes =  ((((dithertable[yeh-15]) - 1) * 0.1));
+	color.rb -= (ohyes / 128);
+	color.g -= (ohyes / 128);
+	{
+	vec4 reduct;		// 16 bits per pixel (5-6-5)
+	reduct.r = 32;
+	reduct.g = 64;	
+	reduct.b = 32;
+	how = color;
+  	how = pow(how, vec4(1.0f, 1.0f, 1.0f, 1.0f));  	how *= reduct;  	how = floor(how);	how = how / reduct;  	how = pow(how, vec4(1.0f, 1.0f, 1.0f, 1.0f));
+	}
+
+	color.rb = how.rb;
+	color.g = how.g;
+
+	// There's a bit of a precision drop involved in the RGB565ening for VGA
+	// I'm not sure why that is. it's exhibited on PVR1 and PVR3 hardware too
+	if (INTERLACED < 0.5)
+	{
+		if (mod(color.r*32, 2.0)>0) color.r -= 0.023;
+		if (mod(color.g*64, 2.0)>0) color.g -= 0.01;
+		if (mod(color.b*32, 2.0)>0) color.b -= 0.023;
+	}
+
+
+	// RGB565 clamp
+
+	color.rb = round(color.rb * 32)/32;
+	color.g = round(color.g * 64)/64;
+
+	// VGA Signal Loss, which probably is very wrong but i tried my best
+	if (bool(VGASIGNAL))
+	{
+
+	int taps = 32;
+	float tap = 12.0f/taps;
+	vec2 texcoord4  = vTexCoord;
+	texcoord4.x = texcoord4.x + (2.0f/640.0f);
+	texcoord4.y = texcoord4.y;
+	vec4 blur1 = texture(Source, texcoord4);
+	int bl;
+	vec4 ble;
+	for (bl=0;bl<taps;bl++)
+		{
+			float e = 1;
+			if (bl>=3)
+			e=0.35f;
+			texcoord4.x -= (tap  / 640);
+			ble.rgb += (texture(Source, texcoord4).rgb * e) / (taps/(bl+1));
+		}
+
+        	color.rgb += ble.rgb * 0.015;
+
+		//color.rb += (4.0f/255.0f);
+		color.g += (9.0f/255.0f);
+	}
+
+   	FragColor = vec4(color);
+}