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80 lines
1.5 KiB
GLSL
80 lines
1.5 KiB
GLSL
@module armature
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@vs vs
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in vec3 pos_in;
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in vec2 uv_in;
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in vec4 indices_in; // is a sokol SG_VERTEXFORMAT_USHORT4N, a 16 bit unsigned integer treated as a floating point number due to webgl compatibility
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in vec4 weights_in;
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out vec3 pos;
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out vec2 uv;
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uniform vs_params {
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mat4 model;
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mat4 view;
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mat4 projection;
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vec2 bones_tex_size;
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};
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uniform sampler2D bones_tex;
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float decode_normalized_float32(vec4 v)
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{
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float sign = 2.0 * v.x - 1.0;
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return sign * (v.z*255.0 + v.y);
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}
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void main() {
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vec4 total_position = vec4(0.0f);
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for(int bone_influence_index = 0; bone_influence_index < 4; bone_influence_index++)
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{
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float index_float = indices_in[bone_influence_index];
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int index = int(index_float * 65535.0);
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float weight = weights_in[bone_influence_index];
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float y_coord = (0.5 + index)/bones_tex_size.y;
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mat4 bone_mat;
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for(int row = 0; row < 4; row++)
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{
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for(int col = 0; col < 4; col++)
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{
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bone_mat[col][row] = decode_normalized_float32(texture(bones_tex, vec2((0.5 + col*4 + row)/bones_tex_size.x, y_coord)));
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}
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}
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vec4 local_position = bone_mat * vec4(pos_in, 1.0f);
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total_position += local_position * weight;
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}
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gl_Position = projection * view * model * total_position;
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//gl_Position = projection * view * model * vec4(pos_in, 1.0);
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pos = gl_Position.xyz;
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uv = uv_in;
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}
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@end
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@fs fs
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uniform sampler2D tex;
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in vec3 pos;
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in vec2 uv;
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out vec4 frag_color;
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void main() {
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vec4 col = texture(tex, uv);
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if(col.a < 0.5)
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{
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discard;
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}
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else
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{
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frag_color = vec4(col.rgb, 1.0);
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}
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}
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@end
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@program program vs fs
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