Initial commit

src/main/resources/assets/voxelmon/shaders/lod/gl46/quads.vert

@@ -0,0 +1,92 @@
+#version 460 core
+#extension GL_ARB_gpu_shader_int64 : enable
+
+#import <voxelmon:lod/gl46/quad_format.glsl>
+#import <voxelmon:lod/gl46/bindings.glsl>
+
+layout(location = 0) out flat vec4 colour;
+
+uint extractLodLevel() {
+    return uint(gl_BaseInstance)>>29;
+}
+
+//Note the last 2 bits of gl_BaseInstance are unused
+//Gives a relative position of +-255 relative to the player center in its respective lod
+ivec3 extractRelativeLodPos() {
+    return (ivec3(gl_BaseInstance)<<ivec3(3,12,21))>>ivec3(23);
+}
+
+vec4 uint2vec4RGBA(uint colour) {
+    return vec4((uvec4(colour)>>uvec4(24,16,8,0))&uvec4(0xFF))/255;
+}
+
+void main() {
+    int cornerIdx = gl_VertexID&3;
+
+    Quad quad = quadData[uint(gl_VertexID)>>2];
+    vec3 innerPos = extractPos(quad);
+
+    uint face = extractFace(quad);
+
+    uint lodLevel = extractLodLevel();
+    ivec3 lodCorner = ((extractRelativeLodPos()<<lodLevel) - (baseSectionPos&(ivec3((1<<lodLevel)-1))))<<5;
+    vec3 corner = innerPos * (1<<lodLevel) + lodCorner;
+
+    //TODO: see if backface culling is even needed, since everything (should) be back culled already
+    //Flip the quad rotation by its face (backface culling)
+    if ((face&1) != 0) {
+        cornerIdx ^= 1;
+    }
+    if ((face>>1) == 0) {
+        cornerIdx ^= 1;
+    }
+
+    ivec2 size = extractSize(quad) * ivec2((cornerIdx>>1)&1, cornerIdx&1) * (1<<lodLevel);
+
+    vec3 pos = corner;
+
+    //NOTE: can just make instead of face, make it axis (can also make it 2 bit instead of 3 bit then)
+    // since the only reason face is needed is to ensure backface culling orientation thing
+    uint axis = face>>1;
+    if (axis == 0) {
+        pos.xz += size;
+        pos.y += (face&1)<<lodLevel;
+    } else if (axis == 1) {
+        pos.xy += size;
+        pos.z += (face&1)<<lodLevel;
+    } else {
+        pos.yz += size;
+        pos.x += (face&1)<<lodLevel;
+    }
+
+    gl_Position = MVP * vec4(pos,1);
+
+    uint stateId = extractStateId(quad);
+    uint biomeId = extractBiomeId(quad);
+    State stateInfo = stateData[stateId];
+    colour = uint2vec4RGBA(stateInfo.faceColours[face]);
+    if (((stateInfo.biomeTintMsk>>face)&1) == 1) {
+        vec4 biomeColour = uint2vec4RGBA(biomeData[biomeId].foliage);
+        colour *= biomeColour;
+    }
+    //Apply water tint
+    if (((stateInfo.biomeTintMsk>>6)&1) == 1) {
+        colour *= vec4(0.247, 0.463, 0.894, 1);
+    }
+    //gl_Position = MVP * vec4(vec3(((cornerIdx)&1)+10,10,((cornerIdx>>1)&1)+10),1);
+    //uint i = uint(quad>>32);
+    uint i = uint(gl_BaseInstance);
+    i ^= i>>16;
+    i *= 124128573;
+    i ^= i>>16;
+    i *= 4211346123;
+    i ^= i>>16;
+    i *= 462312435;
+    i ^= i>>16;
+    i *= 542354341;
+    i ^= i>>16;
+
+    //uint i = uint(lodLevel+12)*215387625;
+    //colour *= vec4(vec3(float((uint(i)>>2)&7)/7,float((uint(i)>>5)&7)/7,float((uint(i)>>8)&7)/7)*0.7+0.3,1);
+    //colour = vec4(vec3(float((uint(i)>>2)&7)/7,float((uint(i)>>5)&7)/7,float((uint(i)>>8)&7)/7),1);
+}