Added compatibility with android

Added util.loadShader - loads shaders and sets uniform variables
Fixed implicit type conversions in shaders

lib/init.lua

@@ -31,10 +31,10 @@ local PostShader = require(_PACKAGE..'postshader')
 local light_world = {}
 light_world.__index = light_world
 
-light_world.image_mask       = love.graphics.newShader(_PACKAGE.."/shaders/image_mask.glsl")
+light_world.image_mask       = util.loadShader(_PACKAGE.."/shaders/image_mask.glsl")
-light_world.shadowShader     = love.graphics.newShader(_PACKAGE.."/shaders/shadow.glsl")
+light_world.shadowShader     = util.loadShader(_PACKAGE.."/shaders/shadow.glsl")
-light_world.refractionShader = love.graphics.newShader(_PACKAGE.."shaders/refraction.glsl")
+light_world.refractionShader = util.loadShader(_PACKAGE.."/shaders/refraction.glsl")
-light_world.reflectionShader = love.graphics.newShader(_PACKAGE.."shaders/reflection.glsl")
+light_world.reflectionShader = util.loadShader(_PACKAGE.."/shaders/reflection.glsl")
 
 local function new(options)
   local obj = {}

lib/postshader.lua

@@ -34,7 +34,7 @@ for i,v in ipairs(files) do
   local name = _PACKAGE.."/shaders/postshaders".."/"..v
   if love.filesystem.isFile(name) then
     local str = love.filesystem.read(name)
-    local effect = love.graphics.newShader(name)
+    local effect = util.loadShader(name)
     local defs = {}
     for vtype, extern in str:gmatch("extern (%w+) (%w+)") do
       defs[extern] = true

lib/shaders/postshaders/blurh.glsl

@@ -3,9 +3,9 @@ extern float steps = 2.0;
 vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
 	vec2 pSize = vec2(1.0 / love_ScreenSize.x, 1.0 / love_ScreenSize.y);
 	vec4 col = Texel(texture, texture_coords);
-	for(int i = 1; i <= steps; i++) {
+	for(int i = 1; i <= int(steps); i++) {
-		col = col + Texel(texture, vec2(texture_coords.x, texture_coords.y - pSize.y * i));
+		col = col + Texel(texture, vec2(texture_coords.x, texture_coords.y - pSize.y * float(i)));
-		col = col + Texel(texture, vec2(texture_coords.x, texture_coords.y + pSize.y * i));
+		col = col + Texel(texture, vec2(texture_coords.x, texture_coords.y + pSize.y * float(i)));
 	}
 	col = col / (steps * 2.0 + 1.0);
 	return vec4(col.r, col.g, col.b, 1.0);

lib/shaders/postshaders/blurv.glsl

@@ -3,9 +3,9 @@ extern float steps = 2.0;
 vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
 	vec2 pSize = vec2(1.0 / love_ScreenSize.x, 1.0 / love_ScreenSize.y);
 	vec4 col = Texel(texture, texture_coords);
-	for(int i = 1; i <= steps; i++) {
+	for(int i = 1; i <= int(steps); i++) {
-		col = col + Texel(texture, vec2(texture_coords.x - pSize.x * i, texture_coords.y));
+		col = col + Texel(texture, vec2(texture_coords.x - pSize.x * float(i), texture_coords.y));
-		col = col + Texel(texture, vec2(texture_coords.x + pSize.x * i, texture_coords.y));
+		col = col + Texel(texture, vec2(texture_coords.x + pSize.x * float(i), texture_coords.y));
 	}
 	col = col / (steps * 2.0 + 1.0);
 	return vec4(col.r, col.g, col.b, 1.0);

lib/shaders/postshaders/four_colors.glsl

@@ -2,7 +2,7 @@ extern vec3 palette[4];
 
 vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords){
 	vec4 pixel = Texel(texture, texture_coords);
-	int index = int(min(0.9999, max(0.0001,(pixel.r + pixel.g + pixel.b) / 3.0)) * 4);
+	int index = int(min(0.9999, max(0.0001,(pixel.r + pixel.g + pixel.b) / 3.0)) * 4.0);
 
 	return vec4(palette[index], 1.0);
 }

lib/shaders/postshaders/phosphor.glsl

@@ -94,22 +94,22 @@ vec4 grid_color( vec2 coords )
 vec2 onex = vec2( 1.0/love_ScreenSize.x, 0.0 );
 vec2 oney = vec2( 0.0, 1.0/love_ScreenSize.y );
 
-vec4 effect(vec4 vcolor, Image texture, vec2 texCoord, vec2 pixel_coords)
+vec4 effect(vec4 vcolor, Image texture, highp vec2 texCoord, vec2 pixel_coords)
 {
-	vec2 coords = (texCoord * love_ScreenSize.xy);
+	highp vec2 coords = (texCoord * love_ScreenSize.xy);
-	vec2 pixel_start = floor(coords);
+	highp vec2 pixel_start = floor(coords);
 	coords -= pixel_start;
-	vec2 pixel_center = pixel_start + vec2(0.5);
+	highp vec2 pixel_center = pixel_start + vec2(0.5);
-	vec2 texture_coords = pixel_center / love_ScreenSize.xy;
+	highp vec2 texture_coords = pixel_center / love_ScreenSize.xy;
 
-	vec4 color = vec4(0.0);
+	highp vec4 color = vec4(0.0);
-	vec4 pixel;
+	highp vec4 pixel;
-	vec3 centers = vec3(-0.25,-0.5,-0.75);
+	highp vec3 centers = vec3(-0.25,-0.5,-0.75);
-	vec3 posx = vec3(coords.x);
+	highp vec3 posx = vec3(coords.x);
-	vec3 hweight;
+	highp vec3 hweight;
-	float vweight;
+	highp float vweight;
-	float dx,dy;
+	highp float dx,dy;
-	float w;
+	highp float w;
 
 	float i,j;
 

lib/shaders/postshaders/phosphorish.glsl

@@ -5,7 +5,7 @@
 */
 // modified by slime73 for use with love pixeleffects
 
-vec3 to_focus(float pixel)
+vec3 to_focus(highp float pixel)
 {
 	pixel = mod(pixel + 3.0, 3.0);
 	if (pixel >= 2.0) // Blue
@@ -16,24 +16,24 @@ vec3 to_focus(float pixel)
 		return vec3(1.0 - pixel, pixel, 0.0);
 }
 
-vec4 effect(vec4 vcolor, Image texture, vec2 texture_coords, vec2 pixel_coords)
+vec4 effect(vec4 vcolor, Image texture, highp vec2 texture_coords, vec2 pixel_coords)
 {
-	float y = mod(texture_coords.y * love_ScreenSize.y, 1.0);
+	highp float y = mod(texture_coords.y * love_ScreenSize.y, 1.0);
-	float intensity = exp(-0.2 * y);
+	highp float intensity = exp(-0.2 * y);
 
-	vec2 one_x = vec2(1.0 / (3.0 * love_ScreenSize.x), 0.0);
+	highp vec2 one_x = vec2(1.0 / (3.0 * love_ScreenSize.x), 0.0);
 
-	vec3 color = Texel(texture, texture_coords - 0.0 * one_x).rgb;
+	highp vec3 color = Texel(texture, texture_coords - 0.0 * one_x).rgb;
-	vec3 color_prev = Texel(texture, texture_coords - 1.0 * one_x).rgb;
+	highp vec3 color_prev = Texel(texture, texture_coords - 1.0 * one_x).rgb;
-	vec3 color_prev_prev = Texel(texture, texture_coords - 2.0 * one_x).rgb;
+	highp vec3 color_prev_prev = Texel(texture, texture_coords - 2.0 * one_x).rgb;
 
-	float pixel_x = 3.0 * texture_coords.x * love_ScreenSize.x;
+	highp float pixel_x = 3.0 * texture_coords.x * love_ScreenSize.x;
 
-	vec3 focus = to_focus(pixel_x - 0.0);
+	highp vec3 focus = to_focus(pixel_x - 0.0);
-	vec3 focus_prev = to_focus(pixel_x - 1.0);
+	highp vec3 focus_prev = to_focus(pixel_x - 1.0);
-	vec3 focus_prev_prev = to_focus(pixel_x - 2.0);
+	highp vec3 focus_prev_prev = to_focus(pixel_x - 2.0);
 
-	vec3 result =
+	highp vec3 result =
 		0.8 * color * focus +
 		0.6 * color_prev * focus_prev +
 		0.3 * color_prev_prev * focus_prev_prev;
@@ -42,4 +42,3 @@ vec4 effect(vec4 vcolor, Image texture, vec2 texture_coords, vec2 pixel_coords)
 
 	return vec4(intensity * result, 1.0);
 }
-

lib/shaders/postshaders/radialblur.glsl

@@ -10,11 +10,11 @@ vec4 effect(vec4 vcolor, Image texture, vec2 texture_coords, vec2 pixel_coords)
 	int i;
 	for (i = 0; i < nsamples; i++)
 	{
-		number scale = blurstart + blurwidth * (i / float(nsamples-1));
+		number scale = blurstart + blurwidth * (float(i) / float(nsamples-1));
 		c.rgb += Texel(texture, texture_coords * scale).rgb;
 	}
 
-	c.rgb /= nsamples;
+	c.rgb /= float(nsamples);
 
 	return c;
 }

lib/shaders/reflection.glsl

@@ -9,11 +9,11 @@ vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
 	if(normal.a > 0.0 && normal.r > 0.0) {
 		vec3 pColor = Texel(backBuffer, texture_coords).rgb;
 		vec4 pColor2;
-		for(int i = 0; i < reflectionStrength; i++) {
+		for(int i = 0; i < int(reflectionStrength); i++) {
-			pColor2 = Texel(texture, vec2(texture_coords.x, texture_coords.y + pSize.y * i));
+			pColor2 = Texel(texture, vec2(texture_coords.x, texture_coords.y + pSize.y * float(i)));
 			if(pColor2.a > 0.0 && pColor2.g > 0.0) {
-				vec3 rColor = Texel(backBuffer, vec2(texture_coords.x, texture_coords.y + pSize.y * i * 2.0)).rgb;
+				vec3 rColor = Texel(backBuffer, vec2(texture_coords.x, texture_coords.y + pSize.y * float(i) * 2.0)).rgb;
-				return vec4(rColor, (1.0 - i / reflectionStrength) * reflectionVisibility);
+				return vec4(rColor, (1.0 - float(i) / reflectionStrength) * reflectionVisibility);
 			}
 		}
 		return vec4(0.0);

lib/shaders/shadow.glsl

@@ -32,7 +32,7 @@ vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
         pixel.rgb = lightColor * pow(att, lightSmooth);
       }
     } else {
-      vec3 normal = normalize(vec3(normalColor.r,invert_normal ? 1 - normalColor.g : normalColor.g, normalColor.b) * 2.0 - 1.0); 
+      vec3 normal = normalize(vec3(normalColor.r,invert_normal ? 1.0 - normalColor.g : normalColor.g, normalColor.b) * 2.0 - 1.0); 
       //on the normal map, draw normal shadows
       vec3 dir = vec3((lightPosition.xy - pixel_coords.xy) / love_ScreenSize.xy, lightPosition.z);
       dir.x *= love_ScreenSize.x / love_ScreenSize.y;
@@ -47,4 +47,3 @@ vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords) {
     return pixel;
   }
 }
-

lib/util.lua

@@ -59,4 +59,41 @@ function util.drawto(canvas, x, y, scale, cb)
   love.graphics.pop()
 end
 
+function util.loadShader(name)
+  local shader = ""
+  local externInit = {}
+  for line in love.filesystem.lines(name) do
+
+    if line:sub(1,6) == "extern" then
+      local type, name = line:match("extern (%w+) (%w+)")
+      local value = line:match("=(.*);")
+      if value then
+        externInit[name] = {type=type, val=value}
+        line = line:match("extern %w+ %w+")..";"
+      end
+    end
+    shader = shader.."\n"..line
+  end
+
+  local effect = love.graphics.newShader(shader)
+  for k, v in pairs(externInit) do
+    if v.type == "bool" then
+      effect:send(k, v.val)
+    elseif v.type == "int" or v.type == "uint" then
+      effect:sendInt(k, tonumber(v.val))
+    elseif v.type == "float" or v.type == "double" or v.type == "number" then
+      effect:send(k, tonumber(v.val))
+    elseif v.type:sub(1,3) == "vec" then
+      v.val = v.val:gsub(" ", ""):sub(6):sub(1, -2)
+      local next = v.val:gmatch("([^,]+)")
+      local values = {}
+      for n in next do
+        table.insert(values, tonumber(n))
+      end
+      effect:send(k, values)
+    end
+  end
+  return effect
+end
+
 return util