2019-07-12 08:44:36 +00:00
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#version 110
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//include an additional space here so that we can programmatically search for and disable this preprocessor definition easily
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#define POLYMOST1_EXTENDED
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//s_texture points to an indexed color texture
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uniform sampler2D s_texture;
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//s_palswap is the palette swap texture where u is the color index and v is the shade
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uniform sampler2D s_palswap;
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//s_palette is the base palette texture where u is the color index
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uniform sampler2D s_palette;
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#ifdef POLYMOST1_EXTENDED
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uniform sampler2D s_detail;
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uniform sampler2D s_glow;
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#endif
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//u_texturePosSize is the texture position & size packaged into a single vec4 as {pos.x, pos.y, size.x, size.y}
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uniform vec4 u_texturePosSize;
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uniform vec2 u_halfTexelSize;
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uniform vec2 u_palswapPos;
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uniform vec2 u_palswapSize;
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uniform float u_shade;
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uniform float u_numShades;
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uniform float u_visFactor;
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uniform float u_fogEnabled;
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uniform float u_useColorOnly;
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uniform float u_usePalette;
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uniform float u_npotEmulation;
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uniform float u_npotEmulationFactor;
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uniform float u_npotEmulationXOffset;
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uniform float u_shadeInterpolate;
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2019-09-20 13:02:49 +00:00
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uniform float u_brightness;
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2019-07-12 08:44:36 +00:00
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#ifdef POLYMOST1_EXTENDED
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uniform float u_useDetailMapping;
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uniform float u_useGlowMapping;
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#endif
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varying vec4 v_color;
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varying float v_distance;
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const float c_basepalScale = 255.0/256.0;
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const float c_basepalOffset = 0.5/256.0;
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const float c_zero = 0.0;
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const float c_one = 1.0;
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const float c_two = 2.0;
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const vec4 c_vec4_one = vec4(c_one);
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const float c_wrapThreshold = 0.9;
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void main()
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{
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float coordY = mix(gl_TexCoord[0].y,gl_TexCoord[0].x,u_usePalette);
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float coordX = mix(gl_TexCoord[0].x,gl_TexCoord[0].y,u_usePalette);
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float period = floor(coordY/u_npotEmulationFactor);
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coordX += u_npotEmulationXOffset*floor(mod(coordY,u_npotEmulationFactor));
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coordY = period+mod(coordY,u_npotEmulationFactor);
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vec2 newCoord = mix(gl_TexCoord[0].xy,mix(vec2(coordX,coordY),vec2(coordY,coordX),u_usePalette),u_npotEmulation);
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vec2 transitionBlend = fwidth(floor(newCoord.xy));
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transitionBlend = fwidth(transitionBlend)+transitionBlend;
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vec2 texCoord = mix(fract(newCoord.xy), abs(c_one-mod(newCoord.xy+c_one, c_two)), transitionBlend);
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texCoord = clamp(u_texturePosSize.zw*texCoord, u_halfTexelSize, u_texturePosSize.zw-u_halfTexelSize);
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vec4 color = texture2D(s_texture, u_texturePosSize.xy+texCoord);
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float shade = clamp((u_shade+max(u_visFactor*v_distance-0.5*u_shadeInterpolate,c_zero)), c_zero, u_numShades-c_one);
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float shadeFrac = mod(shade, c_one);
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float colorIndex = texture2D(s_palswap, u_palswapPos+u_palswapSize*vec2(color.r, floor(shade)/u_numShades)).r;
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colorIndex = c_basepalOffset + c_basepalScale*colorIndex;
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vec4 palettedColor = texture2D(s_palette, vec2(colorIndex, c_zero));
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colorIndex = texture2D(s_palswap, u_palswapPos+u_palswapSize*vec2(color.r, (floor(shade)+c_one)/u_numShades)).r;
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colorIndex = c_basepalOffset + c_basepalScale*colorIndex;
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vec4 palettedColorNext = texture2D(s_palette, vec2(colorIndex, c_zero));
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palettedColor.rgb = mix(palettedColor.rgb, palettedColorNext.rgb, shadeFrac*u_shadeInterpolate);
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float fullbright = mix(u_usePalette*palettedColor.a, c_zero, u_useColorOnly);
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palettedColor.a = c_one-floor(color.r);
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color = mix(color, palettedColor, u_usePalette);
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#ifdef POLYMOST1_EXTENDED
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vec4 detailColor = texture2D(s_detail, gl_TexCoord[3].xy);
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detailColor = mix(c_vec4_one, 2.0*detailColor, u_useDetailMapping*detailColor.a);
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color.rgb *= detailColor.rgb;
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#endif
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color = mix(color, c_vec4_one, u_useColorOnly);
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// DEBUG
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//color = texture2D(s_palswap, gl_TexCoord[0].xy);
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//color = texture2D(s_palette, gl_TexCoord[0].xy);
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//color = texture2D(s_texture, gl_TexCoord[0].yx);
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color.rgb = mix(v_color.rgb*color.rgb, color.rgb, fullbright);
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float fogEnabled = mix(u_fogEnabled, c_zero, u_usePalette);
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fullbright = max(c_one-fogEnabled, fullbright);
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float fogFactor = clamp((gl_Fog.end-gl_FogFragCoord)*gl_Fog.scale, fullbright, c_one);
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//float fogFactor = clamp(gl_FogFragCoord, fullbright, c_one);
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color.rgb = mix(gl_Fog.color.rgb, color.rgb, fogFactor);
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#ifdef POLYMOST1_EXTENDED
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vec4 glowColor = texture2D(s_glow, gl_TexCoord[4].xy);
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color.rgb = mix(color.rgb, glowColor.rgb, u_useGlowMapping*glowColor.a*(c_one-u_useColorOnly));
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#endif
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color.a *= v_color.a;
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2019-09-20 13:02:49 +00:00
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color.rgb = pow(color.rgb, vec3(u_brightness));
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2019-07-12 08:44:36 +00:00
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gl_FragData[0] = color;
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}
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