public static void SetTexturingMode(int samplerIndex, TexturingModes mode)
{
var previousMode = samplerTexturingModes[samplerIndex];
if (previousMode == mode)
{
return;
}
if (samplerTextureIds[samplerIndex] != 0)
{
UnbindTexture(samplerTextureIds[samplerIndex]);
}
// Only matters for the fixed pipeline
if (samplerIndex < maxFpTextureUnits)
{
ActiveTextureUnit = samplerIndex;
if (previousMode != TexturingModes.None)
{
SetCapability((EnableCap)ToTextureTarget(previousMode), false);
}
if (mode != TexturingModes.None)
{
SetCapability((EnableCap)ToTextureTarget(mode), true);
}
}
samplerTexturingModes[samplerIndex] = mode;
}
public static TextureTarget ToTextureTarget(TexturingModes mode)
{
switch (mode)
{
case TexturingModes.Texturing2d: return(TextureTarget.Texture2D);
case TexturingModes.Texturing3d: return(TextureTarget.Texture3D);
default: throw new InvalidOperationException("Not texture target matches the texturing mode " + mode);
}
}
public static void Initialize(ResourceManager resourceManager, int width, int height)
{
retrieveRendererInfo();
setupDebugOutput();
GL.Hint(HintTarget.PerspectiveCorrectionHint, HintMode.Nicest);
SetCapability(EnableCap.Lighting, false);
if (UseSrgb && HasCapabilities(3, 0, "GL_ARB_framebuffer_object"))
{
int defaultFramebufferColorEncoding;
GL.GetFramebufferAttachmentParameter(FramebufferTarget.Framebuffer, FramebufferAttachment.BackLeft, FramebufferParameterName.FramebufferAttachmentColorEncoding, out defaultFramebufferColorEncoding);
if (defaultFramebufferColorEncoding == (int)0x8C40)
{
SetCapability(EnableCap.FramebufferSrgb, true);
colorCorrected = true;
}
else
{
Trace.WriteLine("Warning: The default framebuffer isn't sRgb");
}
}
// glActiveTexture requires opengl 1.3
maxFpTextureUnits = HasCapabilities(1, 3) ? GL.GetInteger(GetPName.MaxTextureUnits) : 1;
maxTextureImageUnits = GL.GetInteger(GetPName.MaxTextureImageUnits);
maxVertexTextureImageUnits = GL.GetInteger(GetPName.MaxVertexTextureImageUnits);
maxGeometryTextureImageUnits = HasCapabilities(3, 2, "GL_ARB_geometry_shader4") ? GL.GetInteger(GetPName.MaxGeometryTextureImageUnits) : 0;
maxCombinedTextureImageUnits = GL.GetInteger(GetPName.MaxCombinedTextureImageUnits);
maxTextureCoords = GL.GetInteger(GetPName.MaxTextureCoords);
// glDrawBuffers requires opengl 2.0
maxDrawBuffers = HasCapabilities(2, 0) ? GL.GetInteger(GetPName.MaxDrawBuffers) : 1;
Trace.WriteLine($"texture units available: fp:{maxFpTextureUnits} ps:{maxTextureImageUnits} vs:{maxVertexTextureImageUnits} gs:{maxGeometryTextureImageUnits} combined:{maxCombinedTextureImageUnits} coords:{maxTextureCoords}");
samplerTextureIds = new int[maxTextureImageUnits];
samplerTexturingModes = new TexturingModes[maxTextureImageUnits];
CheckError("initializing openGL context");
whitePixel = Texture2d.Create(Color4.White, "whitepixel");
normalPixel = Texture2d.Create(new Color4(0.5f, 0.5f, 1, 1), "normalpixel", 1, 1, new TextureOptions()
{
Srgb = false,
});
textGenerator = new TextGenerator(resourceManager);
textFontManager = new TextFontManager();
Viewport = new Rectangle(0, 0, width, height);
}
/// <summary>
/// Bind the texture to a specific texture unit using its textureId and activate it
/// </summary>
public static void BindTexture(int textureId, int samplerIndex = 0, TexturingModes mode = TexturingModes.Texturing2d)
{
if (textureId == 0)
{
throw new ArgumentException("Use UnbindTexture instead");
}
SetTexturingMode(samplerIndex, mode);
ActiveTextureUnit = samplerIndex;
if (samplerTextureIds[samplerIndex] != textureId)
{
GL.BindTexture(ToTextureTarget(mode), textureId);
samplerTextureIds[samplerIndex] = textureId;
//Debug.Print("Bound texture " + textureId + " (" + mode + ") to unit " + samplerIndex);
TextureBinds++;
}
}
/// <summary>
/// Bind the texture in the first texture unit by its textureId and activate it
/// </summary>
public static void BindPrimaryTexture(int textureId, TexturingModes mode = TexturingModes.Texturing2d)
{
BindTexture(textureId, 0, mode);
}
