func (video *Video) initGL() {
video.fpsmanager = gfx.NewFramerate()
video.fpsmanager.SetFramerate(60)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
video.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := attribLocation(video.prog, "vPosition")
texCoordAttr := attribLocation(video.prog, "vTexCoord")
paletteLoc := uniformLocation(video.prog, "palette")
video.textureUni = uniformLocation(video.prog, "texture")
video.texture = GenTexture()
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, video.texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.UseProgram(video.prog)
gl.EnableVertexAttribArray(posAttrib)
gl.EnableVertexAttribArray(texCoordAttr)
gl.Uniform3iv(paletteLoc, len(nes.ShaderPalette), nes.ShaderPalette)
// gl.Uniform4iv(paletteLoc, len(PaletteRgb), PaletteRgb)
vertVBO := GenBuffer()
checkGLError()
gl.BindBuffer(gl.ARRAY_BUFFER, vertVBO)
verts := []float32{-1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(verts)*4, gl.Void(&verts[0]), gl.STATIC_DRAW)
textCoorBuf := GenBuffer()
checkGLError()
gl.BindBuffer(gl.ARRAY_BUFFER, textCoorBuf)
texVerts := []float32{0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(texVerts)*4, gl.Void(&texVerts[0]), gl.STATIC_DRAW)
gl.VertexAttribPointer(posAttrib, 2, gl.FLOAT, false, 0, 0)
gl.VertexAttribPointer(texCoordAttr, 2, gl.FLOAT, false, 0, 0)
log.Printf("OPENGL INITIALIZED.......")
}
func (video *Video) drawFrame() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(video.prog)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, video.texture)
if video.pixelBuffer != nil {
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 256, 256, 0,
gl.RGBA, gl.UNSIGNED_SHORT_4_4_4_4, gl.Void(&(<-video.pixelBuffer)[0]))
}
gl.DrawArrays(gl.TRIANGLES, 0, 6)
video.fpsmanager.FramerateDelay()
}
func GenTexture() uint {
var tex uint
gl.GenBuffers(1, gl.Void(&tex))
return tex
}
func GenBuffer() uint {
var buf uint
gl.GenBuffers(1, gl.Void(&buf))
return buf
}