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75 lines
1.7 KiB
Go
Executable File
75 lines
1.7 KiB
Go
Executable File
package shaders
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import (
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"github.com/bloeys/go-sdl-engine/buffers"
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"github.com/bloeys/go-sdl-engine/logging"
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"github.com/go-gl/gl/v4.6-compatibility/gl"
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)
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type ShaderProgram struct {
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ID uint32
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VertShaderID uint32
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FragShaderID uint32
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}
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func (sp *ShaderProgram) AttachShader(shader Shader) {
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gl.AttachShader(sp.ID, shader.ID)
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switch shader.ShaderType {
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case VertexShaderType:
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sp.VertShaderID = shader.ID
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case FragmentShaderType:
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sp.FragShaderID = shader.ID
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default:
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logging.ErrLog.Println("Unknown shader type ", shader.ShaderType, " for ID ", shader.ID)
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}
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}
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func (sp *ShaderProgram) Link() {
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gl.LinkProgram(sp.ID)
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if sp.VertShaderID != 0 {
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gl.DeleteShader(sp.VertShaderID)
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}
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if sp.FragShaderID != 0 {
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gl.DeleteShader(sp.FragShaderID)
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}
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}
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func (sp *ShaderProgram) Activate() {
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gl.UseProgram(sp.ID)
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}
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func (sp *ShaderProgram) Deactivate() {
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gl.UseProgram(0)
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}
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func (sp *ShaderProgram) GetAttribLoc(attribName string) int32 {
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return gl.GetAttribLocation(sp.ID, gl.Str(attribName+"\x00"))
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}
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func (sp *ShaderProgram) SetAttribute(attribName string, bufObj *buffers.BufferObject, buf *buffers.Buffer) {
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bufObj.Activate()
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buf.Activate()
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attribLoc := sp.GetAttribLoc(attribName)
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gl.VertexAttribPointer(uint32(attribLoc), buf.ElementCount, buf.ElementType, false, buf.GetSize(), gl.PtrOffset(0))
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bufObj.Activate()
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buf.Deactivate()
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}
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func (sp *ShaderProgram) EnableAttribute(attribName string) {
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gl.EnableVertexAttribArray(uint32(sp.GetAttribLoc(attribName)))
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}
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func (sp *ShaderProgram) DisableAttribute(attribName string) {
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gl.DisableVertexAttribArray(uint32(sp.GetAttribLoc(attribName)))
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}
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func (sp *ShaderProgram) Delete() {
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gl.DeleteProgram(sp.ID)
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}
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