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63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
package gl33
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import (
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"strconv"
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"strings"
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"aego/core/errs"
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"aego/core/handle"
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"aego/gpu"
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"aego/gpu/gl33/gl"
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)
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func (d *Device) UniformBlockLayout(h gpu.ShaderHandle, slot int) (gpu.UniformBlockLayout, bool, error) {
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s, ok := d.shaders.Get(handle.Cast[glShader](h))
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if !ok {
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return gpu.UniformBlockLayout{}, false, errs.New(errs.GPUInvalidHandle, "uniform layout: invalid shader")
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}
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name := append([]byte("ub"+strconv.Itoa(slot)), 0)
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block := gl.GetUniformBlockIndex(s.program, &name[0])
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if block == gl.INVALID_INDEX {
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return gpu.UniformBlockLayout{}, false, nil
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}
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var size, count int32
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gl.GetActiveUniformBlockiv(s.program, block, gl.UNIFORM_BLOCK_DATA_SIZE, &size)
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gl.GetActiveUniformBlockiv(s.program, block, gl.UNIFORM_BLOCK_ACTIVE_UNIFORMS, &count)
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out := gpu.UniformBlockLayout{Size: int(size)}
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if count <= 0 {
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return out, true, nil
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}
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indices := make([]int32, count)
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gl.GetActiveUniformBlockiv(s.program, block, gl.UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES, &indices[0])
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buf := make([]byte, 256)
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for _, raw := range indices {
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index := uint32(raw)
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var length, n, offset int32
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var kind uint32
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gl.GetActiveUniform(s.program, index, int32(len(buf)), &length, &n, &kind, &buf[0])
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gl.GetActiveUniformsiv(s.program, 1, &index, gl.UNIFORM_OFFSET, &offset)
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out.Members = append(out.Members, gpu.UniformMember{Name: strings.TrimSuffix(string(buf[:length]), "[0]"), Type: uniformType(kind), Offset: int(offset)})
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}
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return out, true, nil
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}
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func uniformType(t uint32) string {
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switch t {
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case gl.FLOAT:
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return "float"
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case gl.INT:
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return "int"
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case gl.BOOL:
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return "bool"
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case gl.FLOAT_VEC2:
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return "vec2"
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case gl.FLOAT_VEC3:
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return "vec3"
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case gl.FLOAT_VEC4:
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return "vec4"
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case gl.FLOAT_MAT4:
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return "mat4"
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}
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return "unknown"
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}
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