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#version 330 core
in vec2 UvPosition;
uniform float time;
uniform int block;
uniform sampler2D textureAtlas;
// TextureIndex: [most significant bit]<-...<-side[3bit]<-id[13]<-state[4]
layout(std140) uniform TextureIndexes { // binding point: 0
int totalTextures;
int indexes[2047];
};
// layout(std140) uniform TextureData { vec4 textureData[1024]; }; //binding point: 1
// layout(std140) uniform TextureData2 { vec4 textureData2[1024]; }; //binddingpoint: 2
vec4 GetTextureByBlockId(int BlockId);
vec2 TransformTextureCoord(vec4 TextureAtlasCoords, vec2 UvCoords);
void main() {
vec4 bad = vec4(1,0,0,1);
vec4 color = vec4(0,1,0,1);
if (totalTextures!=6)
color = bad;
if (indexes[0]!=393248)
color = bad;
for (int i=1;i<2047;i++)
if (indexes[i]!=0)
color=bad;
gl_FragColor = color;
/*vec4 BlockTextureCoords = GetTextureByBlockId(block);
vec2 AtlasCoords = TransformTextureCoord(BlockTextureCoords, UvPosition);
gl_FragColor = texture(textureAtlas, AtlasCoords);*/
}
vec4 GetTextureByBlockId(int BlockId) {
if (indexes[0] == 0)
return vec4(0.05, 0.004, 0.007, 0.004);
if (totalTextures == 0)
return vec4(0, 0, 0.1, 0.1);
for (int i = 0; i < totalTextures; i++) {
int index = indexes[i + 1];
int side = (index & 0xE0000) >> 16;
int id = (index & 0xFF0) >> 4;
int state = index & 0xF;
if (id == BlockId) {
return vec4(i, 0, 1, 1);
}
}
/*
TNT texture:
X 0.0546875
Y ~0.00442477876106194690
W 0.0078125
H ~0.00442477876106194690
*/
return vec4(0.0546875, 0.00442477876106194690, 0.0078125,
0.00442477876106194690);
}
vec2 TransformTextureCoord(vec4 TextureAtlasCoords, vec2 UvCoords) {
float x = TextureAtlasCoords.x;
float y = TextureAtlasCoords.y;
float w = TextureAtlasCoords.z;
float h = TextureAtlasCoords.w;
vec2 A = vec2(x, y);
vec2 B = vec2(x + w, y + h);
const bool isTextureFlippedVertically = true;
if (isTextureFlippedVertically) {
y = 1 - y;
A = vec2(x, y - h);
B = vec2(x + w, y);
}
return A + UvCoords * (B - A);
}
/*
float near = 1.0;
float far = 100.0;
float LinearizeDepth(float depth)
{
float z = depth * 2.0 - 1.0; // Back to NDC
return (2.0 * near * far) / (far + near - z * (far - near));
}
void main()
{
float depth = LinearizeDepth(gl_FragCoord.z) / far; // divide by far for demonstration
gl_FragColor = vec4(vec3(depth), 1.0f);
}*/
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