Start implementing InitFramebuffer

Author: kivutar

core/core.go

@@ -5,6 +5,7 @@ package core
 import (
 	"archive/zip"
 	"errors"
+	"fmt"
 	"io"
 	"log"
 	"os"
@@ -154,6 +155,9 @@ func LoadGame(filename string) error {
 	state.Global.MenuActive = false
 	state.Global.GamePath = filename
 
+	fmt.Println(vid.Geom.BaseWidth)
+	vid.InitFramebuffer(vid.Geom.BaseWidth, vid.Geom.BaseHeight)
+
 	log.Println("[Core]: Game loaded: " + filename)
 	return nil
 }

core/environment.go

@@ -48,6 +48,8 @@ func environment(cmd uint32, data unsafe.Pointer) bool {
 		state.Global.AudioCb = libretro.SetAudioCallback(data)
 	case libretro.EnvironmentSetHWRenderer:
 		state.Global.HWRenderCb = libretro.SetHWRenderCallback(data)
+		state.Global.HWRenderCb.GetCurrentFramebuffer = vid.CurrentFramebuffer
+		state.Global.HWRenderCb.GetProcAddress = vid.ProcAddress
 		fmt.Println(state.Global.HWRenderCb)
 		return true
 	case libretro.EnvironmentGetCanDupe:

libretro/libretro.go

@@ -130,7 +130,7 @@ type HWRenderCallback struct {
 	HWContextType              uint
 	ContextReset               func()
 	GetCurrentFramebuffer      func() uintptr
-	GetProcAddress             func()
+	GetProcAddress             func() uintptr
 	Depth                      bool
 	Stencil                    bool
 	BottomLeftOrigin           bool

video/video.go

@@ -51,6 +51,7 @@ type Video struct {
 	pixFmt         uint32
 	pixType        uint32
 	bpp            int32
+	fboID          uint32
 }
 
 // Init instanciates the video package
@@ -124,6 +125,12 @@ func (video *Video) configureContext() uint {
 	return GLSLVersion
 }
 
+func (video *Video) InitFramebuffer(width, height int) {
+	gl.GenFramebuffers(1, &video.fboID)
+	gl.BindFramebuffer(gl.FRAMEBUFFER, video.fboID)
+	gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, video.texID, 0)
+}
+
 // Configure instanciates the video package
 func (video *Video) Configure(fullscreen bool) {
 	var width, height int
@@ -348,6 +355,15 @@ func (video *Video) Refresh(data unsafe.Pointer, width int32, height int32, pitc
 	}
 }
 
+// CurrentFramebuffer returns the current FBO ID
+func (video *Video) CurrentFramebuffer() uintptr {
+	return uintptr(video.fboID)
+}
+
+func (video *Video) ProcAddress() uintptr {
+	return 0
+}
+
 var vertices = []float32{
 	//  X, Y, U, V
 	-1.0, -1.0, 0.0, 1.0, // left-bottom