VBOs+attributes+drawing with VBOs

shaders/shader_program.go

@@ -0,0 +1,49 @@
+package shaders
+
+import (
+	"github.com/bloeys/go-sdl-engine/logging"
+	"github.com/go-gl/gl/v4.6-compatibility/gl"
+)
+
+type ShaderProgram struct {
+	ID           uint32
+	VertShaderID uint32
+	FragShaderID uint32
+}
+
+func (sp *ShaderProgram) AttachShader(shader Shader) {
+
+	gl.AttachShader(sp.ID, shader.ID)
+	switch shader.ShaderType {
+	case VertexShaderType:
+		sp.VertShaderID = shader.ID
+	case FragmentShaderType:
+		sp.FragShaderID = shader.ID
+	default:
+		logging.ErrLog.Println("Unknown shader type ", shader.ShaderType, " for ID ", shader.ID)
+	}
+}
+
+func (sp *ShaderProgram) Link() {
+
+	gl.LinkProgram(sp.ID)
+
+	if sp.VertShaderID != 0 {
+		gl.DeleteShader(sp.VertShaderID)
+	}
+	if sp.FragShaderID != 0 {
+		gl.DeleteShader(sp.FragShaderID)
+	}
+}
+
+func (sp *ShaderProgram) GetAttribLoc(attribName string) int32 {
+	return gl.GetAttribLocation(sp.ID, gl.Str(attribName+"\x00"))
+}
+
+func (sp *ShaderProgram) Use() {
+	gl.UseProgram(sp.ID)
+}
+
+func (sp *ShaderProgram) Delete() {
+	gl.DeleteProgram(sp.ID)
+}

shaders/shaders.go

@@ -18,41 +18,6 @@ func (s Shader) Delete() {
 	gl.DeleteShader(s.ID)
 }
 
-type ShaderProgram struct {
-	ID           uint32
-	VertShaderID uint32
-	FragShaderID uint32
-}
-
-func (sp *ShaderProgram) AttachShader(shader Shader) {
-
-	gl.AttachShader(sp.ID, shader.ID)
-	switch shader.ShaderType {
-	case VertexShaderType:
-		sp.VertShaderID = shader.ID
-	case FragmentShaderType:
-		sp.FragShaderID = shader.ID
-	default:
-		logging.ErrLog.Println("Unknown shader type ", shader.ShaderType, " for ID ", shader.ID)
-	}
-}
-
-func (sp *ShaderProgram) Link() {
-
-	gl.LinkProgram(sp.ID)
-
-	if sp.VertShaderID != 0 {
-		gl.DeleteShader(sp.VertShaderID)
-	}
-	if sp.FragShaderID != 0 {
-		gl.DeleteShader(sp.FragShaderID)
-	}
-}
-
-func (sp *ShaderProgram) Delete() {
-	gl.DeleteProgram(sp.ID)
-}
-
 func NewShaderProgram() (ShaderProgram, error) {
 
 	id := gl.CreateProgram()