entryway
Forum Staple
Posts: 2779
Registered: 0104 
Graf Zahl said:
Why is that?
Real texture contains only indexes of colors and I get the real color of each pixel in realtime in shader from colormap texture and filtering must be done directly in shader. How can I make smoothing between MIPlevels in shader in this case?
code: // Fragment shader for hiquality bilinear filternig
void DoFiltering()
{
vec2 pixel_c = vec2(rgbaBias) +
vec2(rgbaScale) * texture2D(tex, texCoord).rg;
vec2 pixel_r = vec2(rgbaBias) +
vec2(rgbaScale) * texture2D(tex, texCoord.xy + vec2(texelSizes.x, 0)).rg;
vec2 pixel_b = vec2(rgbaBias) +
vec2(rgbaScale) * texture2D(tex, texCoord.xy + vec2(0, texelSizes.y)).rg;
vec2 pixel_rb = vec2(rgbaBias) +
vec2(rgbaScale) * texture2D(tex, texCoord.xy + texelSizes).rg;
vec4 texel_c = vec4(texture2D(texColormap, vec2(pixel_c.r, cm)).rgb, pixel_c.g);
vec4 texel_r = vec4(texture2D(texColormap, vec2(pixel_r.r, cm)).rgb, pixel_r.g);
vec4 texel_b = vec4(texture2D(texColormap, vec2(pixel_b.r, cm)).rgb, pixel_b.g);
vec4 texel_rb = vec4(texture2D(texColormap, vec2(pixel_rb.r, cm)).rgb, pixel_rb.g);
vec2 lerpAmounts = fract(texCoord * texSizes);
final = mix(
mix(texel_c, texel_r, lerpAmounts.x),
mix(texel_b, texel_rb, lerpAmounts.x),
lerpAmounts.y);
}
void main()
{
texCoord = gl_TexCoord[0].st  halfTexelSizes;
cm = clamp(Param2  gl_FragCoord.x * Param1, cmMinScaled, cmMaxScaled);
DoFiltering();
gl_FragColor = final * gl_Color;
}
Last edited by entryway on Jun 19 2008 at 00:18
