chaotickittyasteroid/voxel-test
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implement custom chunk meshes, models and shaders.

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catangent 2025-04-14 20:29:41 +01:00
parent e4d536bc87
commit e805891885
7 changed files with 800 additions and 57 deletions
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26
resources/shaders/tiling.fs
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@ -4,8 +4,8 @@ uniform sampler2D diffuseMap;
uniform vec2 textureTiling;
in vec2 fragTexCoord;
in vec2 fragTexCoord2;
in vec4 fragColor;
in vec3 fragNormal;
in vec2 fragTileTexCoord;
flat in int ambientOcclusionSide1;
flat in int ambientOcclusionSide2;
flat in int ambientOcclusionCorner1;
@ -16,14 +16,28 @@ flat in int quadWidth;
out vec4 outColor;
// this is a shitty approximation of arcsin(x)/pi that gets the tails right and is reasonably close to the actual arcsin(x)/pi curve.
float fakeArcsin(float x) {
x = clamp(x, -1.0, 1.0);
float ax = abs(x);
float sqrtPart = sqrt(1.0 - ax);
float result = 0.5 - sqrtPart * (0.5 - 0.06667 * ax);
return x < 0.0 ? -result : result;
}
void main()
{
vec2 texCoord = (floor(fragTexCoord*textureTiling) + fract(fragTexCoord2)) / textureTiling;
vec2 texCoord = (floor(fragTexCoord*textureTiling) + fract(fragTileTexCoord)) / textureTiling;
outColor = texture(diffuseMap, texCoord);
ivec2 floorFragTexCoord2 = ivec2(fragTexCoord2);
if ((fragTexCoord2.x < 0.05 || fragTexCoord2.x > quadWidth-0.05) && (((ambientOcclusionSide1 >> floorFragTexCoord2.y) & 1) == 1)) outColor *= 0.5;
else if((fragTexCoord2.y < 0.05 || fragTexCoord2.y > quadHeight-0.05) && (((ambientOcclusionSide2 >> floorFragTexCoord2.y) & 1) == 1)) outColor *= 0.5;
ivec2 floorFragTileTexCoord = ivec2(fragTileTexCoord);
if(fragTileTexCoord.x < 1 && (((ambientOcclusionSide1 >> floorFragTileTexCoord.y) & 1) == 1)) outColor *= 0.5 + fakeArcsin(fragTileTexCoord.x);
// if(fragTileTexCoord.x < 0.125 && fragTileTexCoord.x < fract(fragTileTexCoord.y) && fragTileTexCoord.x + fract(fragTileTexCoord.y) < 1.0 && ((ambientOcclusionSide1 >> floorFragTileTexCoord.y) & 1) == 1) outColor *= 0.5;
//if((fragTileTexCoord.x < 0.25 || fragTileTexCoord.x > quadWidth-0.25) && (((ambientOcclusionSide1 >> floorFragTileTexCoord.y) & 1) == 1)) outColor *= 0.5;
//if((fragTileTexCoord.y < 0.25 || fragTileTexCoord.y > quadHeight-0.25) && (((ambientOcclusionSide2 >> floorFragTileTexCoord.y) & 1) == 1)) outColor *= 0.5;
outColor.a = 1;
}

34
resources/shaders/tiling.vs
View file

@ -2,13 +2,13 @@
in vec3 vertexPosition;
in vec2 vertexTexCoord;
in vec2 vertexTexCoord2;
in vec4 vertexColor;
in vec4 vertexTangent; // metadata1
in vec3 vertexNormal;
in vec2 vertexTileTexCoord;
in vec4 vertexMetadata1;
out vec2 fragTexCoord;
out vec2 fragTexCoord2;
out vec4 fragColor;
out vec3 fragNormal;
out vec2 fragTileTexCoord;
flat out int ambientOcclusionSide1;
flat out int ambientOcclusionSide2;
@ -22,18 +22,18 @@ uniform mat4 mvp;
void main() {
fragTexCoord = vertexTexCoord;
fragColor = vertexColor;
fragTexCoord2 = vertexTexCoord2;
fragTileTexCoord = vertexTileTexCoord;
fragNormal = vertexNormal;
gl_Position = mvp*vec4(vertexPosition, 1.0);
// metadata 1 processing
ambientOcclusionSide1 = floatBitsToInt(vertexTangent.x);
ambientOcclusionSide2 = floatBitsToInt(vertexTangent.y);
int metadata1Z = floatBitsToInt(vertexTangent.z);
int metadata1W = floatBitsToInt(vertexTangent.w);
ambientOcclusionCorner1 = (metadata1Z & 0x1) >> 0;
ambientOcclusionCorner2 = (metadata1Z & 0x2) >> 1;
ambientOcclusionCorner3 = (metadata1Z & 0x4) >> 2;
quadHeight = (metadata1Z & 0x1f8) >> 3;
quadWidth = (metadata1Z & 0x7e00) >> 9;
// metadata 1 parsing
ambientOcclusionSide1 = floatBitsToInt(vertexMetadata1.x);
ambientOcclusionSide2 = floatBitsToInt(vertexMetadata1.y);
int metadata1Z = floatBitsToInt(vertexMetadata1.z);
int metadata1W = floatBitsToInt(vertexMetadata1.w);
ambientOcclusionCorner1 = (metadata1Z & 0x1) >> 0; // Take 0th bit.
ambientOcclusionCorner2 = (metadata1Z & 0x2) >> 1; // Take 1st bit.
ambientOcclusionCorner3 = (metadata1Z & 0x4) >> 2; // Take 2nd bit.
quadHeight = (metadata1Z & 0x1f8) >> 3; // Take 3rd-8th bits.
quadWidth = (metadata1Z & 0x7e00) >> 9; // Take 9th-14th bits.
}