76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
package main
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import (
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"fmt"
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"unsafe"
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rl "git.terah.dev/UnrealXR/raylib-go/raylib"
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)
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type LightType int32
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const (
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LightTypeDirectional LightType = iota
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LightTypePoint
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)
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type Light struct {
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shader rl.Shader
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lightType LightType
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position rl.Vector3
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target rl.Vector3
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color rl.Color
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enabled int32
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// shader locations
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enabledLoc int32
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typeLoc int32
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posLoc int32
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targetLoc int32
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colorLoc int32
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}
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const maxLightsCount = 4
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var lightCount = 0
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func NewLight(
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lightType LightType,
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position, target rl.Vector3,
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color rl.Color,
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shader rl.Shader) Light {
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light := Light{
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shader: shader,
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}
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if lightCount < maxLightsCount {
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light.enabled = 1
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light.lightType = lightType
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light.position = position
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light.target = target
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light.color = color
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light.enabledLoc = rl.GetShaderLocation(shader, fmt.Sprintf("lights[%d].enabled", lightCount))
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light.typeLoc = rl.GetShaderLocation(shader, fmt.Sprintf("lights[%d].type", lightCount))
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light.posLoc = rl.GetShaderLocation(shader, fmt.Sprintf("lights[%d].position", lightCount))
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light.targetLoc = rl.GetShaderLocation(shader, fmt.Sprintf("lights[%d].target", lightCount))
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light.colorLoc = rl.GetShaderLocation(shader, fmt.Sprintf("lights[%d].color", lightCount))
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light.UpdateValues()
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lightCount++
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}
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return light
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}
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func (lt *Light) UpdateValues() {
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// Send to shader light enabled state and type
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rl.SetShaderValue(lt.shader, lt.enabledLoc, unsafe.Slice((*float32)(unsafe.Pointer(<.enabled)), 4), rl.ShaderUniformInt)
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rl.SetShaderValue(lt.shader, lt.typeLoc, unsafe.Slice((*float32)(unsafe.Pointer(<.lightType)), 4), rl.ShaderUniformInt)
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// Send to shader light position values
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rl.SetShaderValue(lt.shader, lt.posLoc, []float32{lt.position.X, lt.position.Y, lt.position.Z}, rl.ShaderUniformVec3)
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// Send to shader light target target values
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rl.SetShaderValue(lt.shader, lt.targetLoc, []float32{lt.target.X, lt.target.Y, lt.target.Z}, rl.ShaderUniformVec3)
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// Send to shader light color values
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rl.SetShaderValue(lt.shader, lt.colorLoc,
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[]float32{float32(lt.color.R) / 255, float32(lt.color.G) / 255, float32(lt.color.B) / 255, float32(lt.color.A) / 255},
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rl.ShaderUniformVec4)
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}
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