fix: shaders

Updates shaders for new GLSL version in LÖVE 11; fixes #30

shaders/dotnbloom.frag

@@ -25,11 +25,11 @@ float color_bloom(vec3 color)
  return mix(1.0 + shine, 1.0 - shine, bright);
 }
 
-vec3 lookup(Image texture, float offset_x, float offset_y, vec2 coord)
+vec3 lookup(Image texture, vec2 tex, float offset_x, float offset_y, vec2 coord)
 {
  vec2 offset = vec2(offset_x, offset_y);
  vec3 color = Texel(texture, coord).rgb;
- float delta = dist(fract(gl_TexCoord[0].xy * textureSize), offset + vec2(0.5));
+ float delta = dist(fract(tex.xy * textureSize), offset + vec2(0.5));
  return color * exp(-gamma * delta * color_bloom(color));
 }
 
@@ -50,17 +50,17 @@ vec4 effect(vec4 vcolor, Image texture, vec2 tex, vec2 pixel_coords)
  vec2 c12 = tex + vec2( 0, dy);
  vec2 c22 = tex + vec2( dx, dy);
 
- vec3 mid_color = lookup(texture, 0.0, 0.0, c11);
+ vec3 mid_color = lookup(texture, tex, 0.0, 0.0, c11);
  vec3 color = vec3(0.0);
- color += lookup(texture, -1.0, -1.0, c00);
- color += lookup(texture, 0.0, -1.0, c10);
- color += lookup(texture, 1.0, -1.0, c20);
- color += lookup(texture, -1.0, 0.0, c01);
+ color += lookup(texture, tex, -1.0, -1.0, c00);
+ color += lookup(texture, tex,  0.0, -1.0, c10);
+ color += lookup(texture, tex,  1.0, -1.0, c20);
+ color += lookup(texture, tex, -1.0, 0.0, c01);
  color += mid_color;
- color += lookup(texture, 1.0, 0.0, c21);
- color += lookup(texture, -1.0, 1.0, c02);
- color += lookup(texture, 0.0, 1.0, c12);
- color += lookup(texture, 1.0, 1.0, c22);
+ color += lookup(texture, tex,  1.0, 0.0, c21);
+ color += lookup(texture, tex, -1.0, 1.0, c02);
+ color += lookup(texture, tex,  0.0, 1.0, c12);
+ color += lookup(texture, tex,  1.0, 1.0, c22);
  vec3 out_color = mix(1.2 * mid_color, color, blend);
 
  return vec4(out_color, 1.0);

shaders/scanline-3x.frag

@@ -29,6 +29,6 @@ vec4 effect(vec4 vcolor, Image texture, vec2 texture_coords, vec2 pixel_coords)
  intens = vec4(0.0, 0.0, 0.0, 1.0);
  else
  intens = smoothstep(0.2,0.8,rgb) + normalize(vec4(rgb.xyz, 1.0));
- number level = (4.0-gl_TexCoord[0].z) * 0.19;
+ number level = (4.0-texture_coords.x) * 0.19;
  return vec4((intens * (0.5-level) + rgb * 1.1).rgb, 1.0);
 }

shaders/scanline-4x.frag

@@ -29,7 +29,7 @@ vec4 effect(vec4 vcolor, Image texture, vec2 texture_coords, vec2 pixel_coords)
  intens = vec4(0.0, 0.0, 0.0, 1.0);
  else
  intens = smoothstep(0.2,0.8,rgb) + normalize(vec4(rgb.xyz, 1.0));
- number level = (4.0-gl_TexCoord[0].z) * 0.19;
+ number level = (4.0-texture_coords.x) * 0.19;
  return vec4((intens * (0.5-level) + rgb * 1.1).rgb, 1.0);
 }