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Encode channel attributes in a more sensible way.

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This commit is contained in:
Paul Chote
2018-05-31 20:17:40 +00:00
committed by reaperrr
parent 382f4c3af5
commit c307b3e291
2 changed files with 48 additions and 25 deletions
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50
glsl/shp.vert
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@@ -10,21 +10,45 @@ varying vec4 vChannelMask;
varying vec4 vDepthMask;
varying vec4 vColorFraction;
vec4 DecodeChannelMask(float x)
vec2 UnpackChannelAttributes(float x)
{
if (x > 0.7)
// The channel attributes float encodes a set of attributes
// stored as flags in the mantissa of the unnormalized float value.
// Bits 3-5 define the behaviour of the secondary texture channel:
// 000: Channel is not used
// 001, 011, 101, 111: Sample depth sprite from channel R,G,B,A
// Bits 0-2 define the behaviour of the primary texture channel:
// 000: Channel is not used (aVertexTexCoord instead defines a color value)
// 001, 011, 101, 111: Sample paletted sprite from channel R,G,B,A
float secondaryChannel = 0.0;
if (x >= 32.0) { x -= 32.0; secondaryChannel += 4.0; }
if (x >= 16.0) { x -= 16.0; secondaryChannel += 2.0; }
if (x >= 8.0) { x -= 8.0; secondaryChannel += 1.0; }
float primaryChannel = 0.0;
if (x >= 4.0) { x -= 4.0; primaryChannel += 4.0; }
if (x >= 2.0) { x -= 2.0; primaryChannel += 2.0; }
if (x >= 1.0) { x -= 1.0; primaryChannel += 1.0; }
return vec2(primaryChannel, secondaryChannel);
}
vec4 SelectChannelMask(float x)
{
if (x >= 7.0)
return vec4(0,0,0,1);
if (x > 0.5)
if (x >= 5.0)
return vec4(0,0,1,0);
if (x > 0.3)
if (x >= 3.0)
return vec4(0,1,0,0);
if (x > 0.0)
if (x >= 1.0)
return vec4(1,0,0,0);
return vec4(0, 0, 0, 0);
}
vec4 DecodeColorFraction(float x)
vec4 SelectColorFraction(float x)
{
if (x > 0.0)
return vec4(0, 0, 0, 0);
@@ -37,13 +61,9 @@ void main()
gl_Position = vec4((aVertexPosition.xyz - Scroll.xyz) * r1 + r2, 1);
vTexCoord = aVertexTexCoord;
vTexMetadata = aVertexTexMetadata;
vChannelMask = DecodeChannelMask(abs(aVertexTexMetadata.t));
vColorFraction = DecodeColorFraction(abs(aVertexTexMetadata.t));
if (aVertexTexMetadata.t < 0.0)
{
float x = -aVertexTexMetadata.t * 10.0;
vDepthMask = DecodeChannelMask(x - floor(x));
}
else
vDepthMask = vec4(0,0,0,0);
vec2 attrib = UnpackChannelAttributes(aVertexTexMetadata.t);
vChannelMask = SelectChannelMask(attrib.s);
vColorFraction = SelectColorFraction(attrib.s);
vDepthMask = SelectChannelMask(attrib.t);
}