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Migrate rendering to OpenGL 3.2 / OpenGL ES 3.0.

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This commit is contained in:
Paul Chote
2019-08-31 10:30:02 +01:00
committed by RoosterDragon
parent 91c63034d3
commit ce8112fb5a
11 changed files with 250 additions and 103 deletions
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28
OpenRA.Platforms.Default/FrameBuffer.cs
View File

@@ -33,31 +33,32 @@ namespace OpenRA.Platforms.Default
OpenGL.glGenFramebuffers(1, out framebuffer);
OpenGL.CheckGLError();
OpenGL.glBindFramebuffer(OpenGL.FRAMEBUFFER_EXT, framebuffer);
OpenGL.glBindFramebuffer(OpenGL.GL_FRAMEBUFFER, framebuffer);
OpenGL.CheckGLError();
// Color
this.texture = texture;
texture.SetEmpty(size.Width, size.Height);
OpenGL.glFramebufferTexture2D(OpenGL.FRAMEBUFFER_EXT, OpenGL.COLOR_ATTACHMENT0_EXT, OpenGL.GL_TEXTURE_2D, texture.ID, 0);
OpenGL.glFramebufferTexture2D(OpenGL.GL_FRAMEBUFFER, OpenGL.GL_COLOR_ATTACHMENT0, OpenGL.GL_TEXTURE_2D, texture.ID, 0);
OpenGL.CheckGLError();
// Depth
OpenGL.glGenRenderbuffers(1, out depth);
OpenGL.CheckGLError();
OpenGL.glBindRenderbuffer(OpenGL.RENDERBUFFER_EXT, depth);
OpenGL.glBindRenderbuffer(OpenGL.GL_RENDERBUFFER, depth);
OpenGL.CheckGLError();
OpenGL.glRenderbufferStorage(OpenGL.RENDERBUFFER_EXT, OpenGL.GL_DEPTH_COMPONENT, size.Width, size.Height);
var glDepth = OpenGL.Features.HasFlag(OpenGL.GLFeatures.GLES) ? OpenGL.GL_DEPTH_COMPONENT16 : OpenGL.GL_DEPTH_COMPONENT;
OpenGL.glRenderbufferStorage(OpenGL.GL_RENDERBUFFER, glDepth, size.Width, size.Height);
OpenGL.CheckGLError();
OpenGL.glFramebufferRenderbuffer(OpenGL.FRAMEBUFFER_EXT, OpenGL.DEPTH_ATTACHMENT_EXT, OpenGL.RENDERBUFFER_EXT, depth);
OpenGL.glFramebufferRenderbuffer(OpenGL.GL_FRAMEBUFFER, OpenGL.GL_DEPTH_ATTACHMENT, OpenGL.GL_RENDERBUFFER, depth);
OpenGL.CheckGLError();
// Test for completeness
var status = OpenGL.glCheckFramebufferStatus(OpenGL.FRAMEBUFFER_EXT);
if (status != OpenGL.FRAMEBUFFER_COMPLETE_EXT)
var status = OpenGL.glCheckFramebufferStatus(OpenGL.GL_FRAMEBUFFER);
if (status != OpenGL.GL_FRAMEBUFFER_COMPLETE)
{
var error = "Error creating framebuffer: {0}\n{1}".F(status, new StackTrace());
OpenGL.WriteGraphicsLog(error);
@@ -65,19 +66,14 @@ namespace OpenRA.Platforms.Default
}
// Restore default buffer
OpenGL.glBindFramebuffer(OpenGL.FRAMEBUFFER_EXT, 0);
OpenGL.glBindFramebuffer(OpenGL.GL_FRAMEBUFFER, 0);
OpenGL.CheckGLError();
}
static int[] ViewportRectangle()
{
var v = new int[4];
unsafe
{
fixed (int* ptr = &v[0])
OpenGL.glGetIntegerv(OpenGL.GL_VIEWPORT, ptr);
}
OpenGL.glGetIntegerv(OpenGL.GL_VIEWPORT, out v[0]);
OpenGL.CheckGLError();
return v;
}
@@ -92,7 +88,7 @@ namespace OpenRA.Platforms.Default
OpenGL.glFlush();
OpenGL.CheckGLError();
OpenGL.glBindFramebuffer(OpenGL.FRAMEBUFFER_EXT, framebuffer);
OpenGL.glBindFramebuffer(OpenGL.GL_FRAMEBUFFER, framebuffer);
OpenGL.CheckGLError();
OpenGL.glViewport(0, 0, size.Width, size.Height);
OpenGL.CheckGLError();
@@ -107,7 +103,7 @@ namespace OpenRA.Platforms.Default
VerifyThreadAffinity();
OpenGL.glFlush();
OpenGL.CheckGLError();
OpenGL.glBindFramebuffer(OpenGL.FRAMEBUFFER_EXT, 0);
OpenGL.glBindFramebuffer(OpenGL.GL_FRAMEBUFFER, 0);
OpenGL.CheckGLError();
OpenGL.glViewport(cv[0], cv[1], cv[2], cv[3]);
OpenGL.CheckGLError();

97
OpenRA.Platforms.Default/OpenGL.cs
View File

@@ -24,11 +24,12 @@ namespace OpenRA.Platforms.Default
Justification = "C-style naming is kept for consistency with the underlying native API.")]
internal static class OpenGL
{
[Flags]
public enum GLFeatures
{
None = 0,
GL2OrGreater = 1,
FramebufferExt = 4,
Core = 1,
GLES = 2,
}
public static GLFeatures Features { get; private set; }
@@ -105,6 +106,7 @@ namespace OpenRA.Platforms.Default
public const int GL_DYNAMIC_DRAW = 0x88E8;
public const int GL_TEXTURE0 = 0x84C0;
public const int GL_DEPTH_COMPONENT16 = 0x81A5;
// OpenGL 2
public const int GL_FRAGMENT_SHADER = 0x8B30;
@@ -127,14 +129,17 @@ namespace OpenRA.Platforms.Default
public const int GL_RENDERER = 0x1F01;
public const int GL_VERSION = 0x1F02;
public const int GL_EXTENSIONS = 0x1F03;
public const int GL_NUM_EXTENSIONS = 0x821D;
public const int GL_SHADING_LANGUAGE_VERSION = 0x8B8C;
// Framebuffers
public const int FRAMEBUFFER_EXT = 0x8D40;
public const int RENDERBUFFER_EXT = 0x8D41;
public const int COLOR_ATTACHMENT0_EXT = 0x8CE0;
public const int DEPTH_ATTACHMENT_EXT = 0x8D00;
public const int FRAMEBUFFER_COMPLETE_EXT = 0x8CD5;
public const int GL_FRAMEBUFFER = 0x8D40;
public const int GL_RENDERBUFFER = 0x8D41;
public const int GL_COLOR_ATTACHMENT0 = 0x8CE0;
public const int GL_DEPTH_ATTACHMENT = 0x8D00;
public const int GL_FRAMEBUFFER_COMPLETE = 0x8CD5;
public const int GL_FRAMEBUFFER_BINDING = 0x8CA6;
public delegate void Flush();
public static Flush glFlush { get; private set; }
@@ -162,7 +167,18 @@ namespace OpenRA.Platforms.Default
}
}
public unsafe delegate int GetIntegerv(int pname, int* param);
delegate IntPtr GetStringi(int name, uint index);
static GetStringi glGetStringiInternal;
public static string glGetStringi(int name, uint index)
{
unsafe
{
return new string((sbyte*)glGetStringiInternal(name, index));
}
}
public unsafe delegate int GetIntegerv(int pname, out int param);
public static GetIntegerv glGetIntegerv { get; private set; }
public delegate void Finish();
@@ -241,6 +257,12 @@ namespace OpenRA.Platforms.Default
public delegate void BindBuffer(int target, uint buffer);
public static BindBuffer glBindBuffer { get; private set; }
public delegate void GenVertexArrays(int n, out uint buffers);
public static GenVertexArrays glGenVertexArrays { get; private set; }
public delegate void BindVertexArray(uint buffer);
public static BindVertexArray glBindVertexArray { get; private set; }
public delegate void BufferData(int target, IntPtr size, IntPtr data, int usage);
public static BufferData glBufferData { get; private set; }
@@ -253,6 +275,9 @@ namespace OpenRA.Platforms.Default
public delegate void BindAttribLocation(uint program, int index, string name);
public static BindAttribLocation glBindAttribLocation { get; private set; }
public delegate void BindFragDataLocation(uint program, int colorNumber, string name);
public static BindFragDataLocation glBindFragDataLocation { get; private set; }
public delegate void VertexAttribPointer(int index, int size, int type, bool normalized,
int stride, IntPtr pointer);
public static VertexAttribPointer glVertexAttribPointer { get; private set; }
@@ -361,6 +386,7 @@ namespace OpenRA.Platforms.Default
{
glGetError = Bind<GetError>("glGetError");
glGetStringInternal = Bind<GetString>("glGetString");
glGetStringiInternal = Bind<GetStringi>("glGetStringi");
}
catch (Exception)
{
@@ -368,7 +394,7 @@ namespace OpenRA.Platforms.Default
}
DetectGLFeatures();
if (!Features.HasFlag(GLFeatures.GL2OrGreater) || !Features.HasFlag(GLFeatures.FramebufferExt))
if (!Features.HasFlag(GLFeatures.Core))
{
WriteGraphicsLog("Unsupported OpenGL version: " + glGetString(GL_VERSION));
throw new InvalidProgramException("OpenGL Version Error: See graphics.log for details.");
@@ -411,7 +437,10 @@ namespace OpenRA.Platforms.Default
glBufferData = Bind<BufferData>("glBufferData");
glBufferSubData = Bind<BufferSubData>("glBufferSubData");
glDeleteBuffers = Bind<DeleteBuffers>("glDeleteBuffers");
glGenVertexArrays = Bind<GenVertexArrays>("glGenVertexArrays");
glBindVertexArray = Bind<BindVertexArray>("glBindVertexArray");
glBindAttribLocation = Bind<BindAttribLocation>("glBindAttribLocation");
glBindFragDataLocation = Bind<BindFragDataLocation>("glBindFragDataLocation");
glVertexAttribPointer = Bind<VertexAttribPointer>("glVertexAttribPointer");
glEnableVertexAttribArray = Bind<EnableVertexAttribArray>("glEnableVertexAttribArray");
glDisableVertexAttribArray = Bind<DisableVertexAttribArray>("glDisableVertexAttribArray");
@@ -433,16 +462,16 @@ namespace OpenRA.Platforms.Default
glGetTexImage = Bind<GetTexImage>("glGetTexImage");
glTexParameteri = Bind<TexParameteri>("glTexParameteri");
glTexParameterf = Bind<TexParameterf>("glTexParameterf");
glGenFramebuffers = Bind<GenFramebuffers>("glGenFramebuffersEXT");
glBindFramebuffer = Bind<BindFramebuffer>("glBindFramebufferEXT");
glFramebufferTexture2D = Bind<FramebufferTexture2D>("glFramebufferTexture2DEXT");
glDeleteFramebuffers = Bind<DeleteFramebuffers>("glDeleteFramebuffersEXT");
glGenRenderbuffers = Bind<GenRenderbuffers>("glGenRenderbuffersEXT");
glBindRenderbuffer = Bind<BindRenderbuffer>("glBindRenderbufferEXT");
glRenderbufferStorage = Bind<RenderbufferStorage>("glRenderbufferStorageEXT");
glDeleteRenderbuffers = Bind<DeleteRenderbuffers>("glDeleteRenderbuffersEXT");
glFramebufferRenderbuffer = Bind<FramebufferRenderbuffer>("glFramebufferRenderbufferEXT");
glCheckFramebufferStatus = Bind<CheckFramebufferStatus>("glCheckFramebufferStatusEXT");
glGenFramebuffers = Bind<GenFramebuffers>("glGenFramebuffers");
glBindFramebuffer = Bind<BindFramebuffer>("glBindFramebuffer");
glFramebufferTexture2D = Bind<FramebufferTexture2D>("glFramebufferTexture2D");
glDeleteFramebuffers = Bind<DeleteFramebuffers>("glDeleteFramebuffers");
glGenRenderbuffers = Bind<GenRenderbuffers>("glGenRenderbuffers");
glBindRenderbuffer = Bind<BindRenderbuffer>("glBindRenderbuffer");
glRenderbufferStorage = Bind<RenderbufferStorage>("glRenderbufferStorage");
glDeleteRenderbuffers = Bind<DeleteRenderbuffers>("glDeleteRenderbuffers");
glFramebufferRenderbuffer = Bind<FramebufferRenderbuffer>("glFramebufferRenderbuffer");
glCheckFramebufferStatus = Bind<CheckFramebufferStatus>("glCheckFramebufferStatus");
}
catch (Exception e)
{
@@ -461,22 +490,24 @@ namespace OpenRA.Platforms.Default
try
{
Version = glGetString(GL_VERSION);
var version = Version.Contains(" ") ? Version.Split(' ')[0].Split('.') : Version.Split('.');
var major = 0;
if (version.Length > 0)
int.TryParse(version[0], out major);
var minor = 0;
if (version.Length > 1)
int.TryParse(version[1], out minor);
if (major >= 2 && minor >= 0)
Features |= GLFeatures.GL2OrGreater;
// Assume that the first numeric token corresponds to the GL version
foreach (var t in Version.Split())
{
var split = t.Split('.');
if (split.Length >= 2 && int.TryParse(split[0], out major) && int.TryParse(split[1], out minor))
break;
}
var hasFramebufferExt = SDL.SDL_GL_ExtensionSupported("GL_EXT_framebuffer_object") == SDL.SDL_bool.SDL_TRUE;
if (hasFramebufferExt)
Features |= GLFeatures.FramebufferExt;
// Core features are defined as the shared feature set of GL 3.2 and (GLES 3 + BGRA extension)
var hasBGRA = SDL.SDL_GL_ExtensionSupported("GL_EXT_texture_format_BGRA8888") == SDL.SDL_bool.SDL_TRUE;
if (Version.Contains(" ES") && hasBGRA && major >= 3)
Features = GLFeatures.Core | GLFeatures.GLES;
else if (major > 3 || (major == 3 && minor >= 2))
Features = GLFeatures.Core;
}
catch (Exception) { }
}
@@ -516,7 +547,11 @@ namespace OpenRA.Platforms.Default
Log.Write("graphics", "GL Version: {0}", glGetString(GL_VERSION));
Log.Write("graphics", "Shader Version: {0}", glGetString(GL_SHADING_LANGUAGE_VERSION));
Log.Write("graphics", "Available extensions:");
Log.Write("graphics", glGetString(GL_EXTENSIONS));
int extensionCount;
glGetIntegerv(GL_NUM_EXTENSIONS, out extensionCount);
for (var i = 0; i < extensionCount; i++)
Log.Write("graphics", glGetStringi(GL_EXTENSIONS, (uint)i));
}
}
}

7
OpenRA.Platforms.Default/Sdl2GraphicsContext.cs
View File

@@ -37,6 +37,13 @@ namespace OpenRA.Platforms.Default
OpenGL.Initialize();
uint vao;
OpenGL.CheckGLError();
OpenGL.glGenVertexArrays(1, out vao);
OpenGL.CheckGLError();
OpenGL.glBindVertexArray(vao);
OpenGL.CheckGLError();
OpenGL.glEnableVertexAttribArray(Shader.VertexPosAttributeIndex);
OpenGL.CheckGLError();
OpenGL.glEnableVertexAttribArray(Shader.TexCoordAttributeIndex);

49
OpenRA.Platforms.Default/Sdl2PlatformWindow.cs
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@@ -75,8 +75,6 @@ namespace OpenRA.Platforms.Default
public Sdl2PlatformWindow(Size requestWindowSize, WindowMode windowMode, int batchSize)
{
Console.WriteLine("Using SDL 2 with OpenGL renderer");
// Lock the Window/Surface properties until initialization is complete
lock (syncObject)
{
@@ -93,6 +91,25 @@ namespace OpenRA.Platforms.Default
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_BLUE_SIZE, 8);
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_ALPHA_SIZE, 0);
// Decide between OpenGL and OpenGL ES rendering
// Test whether we can use the preferred renderer and fall back to the other if that fails
// If neither works we will throw a graphics error later when trying to create the real window
bool useGLES;
if (Game.Settings.Graphics.PreferGLES)
useGLES = CanCreateGLWindow(3, 0, SDL.SDL_GLprofile.SDL_GL_CONTEXT_PROFILE_ES);
else
useGLES = !CanCreateGLWindow(3, 2, SDL.SDL_GLprofile.SDL_GL_CONTEXT_PROFILE_CORE);
var glMajor = 3;
var glMinor = useGLES ? 0 : 2;
var glProfile = useGLES ? SDL.SDL_GLprofile.SDL_GL_CONTEXT_PROFILE_ES : SDL.SDL_GLprofile.SDL_GL_CONTEXT_PROFILE_CORE;
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_MAJOR_VERSION, glMajor);
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_MINOR_VERSION, glMinor);
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_PROFILE_MASK, (int)glProfile);
Console.WriteLine("Using SDL 2 with OpenGL{0} renderer", useGLES ? " ES" : "");
SDL.SDL_DisplayMode display;
SDL.SDL_GetCurrentDisplayMode(0, out display);
@@ -366,5 +383,33 @@ namespace OpenRA.Platforms.Default
VerifyThreadAffinity();
return input.SetClipboardText(text);
}
static bool CanCreateGLWindow(int major, int minor, SDL.SDL_GLprofile profile)
{
// Implementation inspired by TestIndividualGLVersion from Veldrid
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_MAJOR_VERSION, major);
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_MINOR_VERSION, minor);
SDL.SDL_GL_SetAttribute(SDL.SDL_GLattr.SDL_GL_CONTEXT_PROFILE_MASK, (int)profile);
var flags = SDL.SDL_WindowFlags.SDL_WINDOW_HIDDEN | SDL.SDL_WindowFlags.SDL_WINDOW_OPENGL;
var window = SDL.SDL_CreateWindow("", 0, 0, 1, 1, flags);
if (window == IntPtr.Zero || !string.IsNullOrEmpty(SDL.SDL_GetError()))
{
SDL.SDL_ClearError();
return false;
}
var context = SDL.SDL_GL_CreateContext(window);
if (context == IntPtr.Zero || SDL.SDL_GL_MakeCurrent(window, context) < 0)
{
SDL.SDL_ClearError();
SDL.SDL_DestroyWindow(window);
return false;
}
SDL.SDL_GL_DeleteContext(context);
SDL.SDL_DestroyWindow(window);
return true;
}
}
}

7
OpenRA.Platforms.Default/Shader.cs
View File

@@ -33,6 +33,9 @@ namespace OpenRA.Platforms.Default
var filename = Path.Combine(Platform.GameDir, "glsl", name + "." + ext);
var code = File.ReadAllText(filename);
var version = OpenGL.Features.HasFlag(OpenGL.GLFeatures.GLES) ? "300 es" : "140";
code = code.Replace("{VERSION}", version);
var shader = OpenGL.glCreateShader(type);
OpenGL.CheckGLError();
unsafe
@@ -77,6 +80,9 @@ namespace OpenRA.Platforms.Default
OpenGL.CheckGLError();
OpenGL.glBindAttribLocation(program, TexMetadataAttributeIndex, "aVertexTexMetadata");
OpenGL.CheckGLError();
OpenGL.glBindFragDataLocation(program, 0, "fragColor");
OpenGL.CheckGLError();
OpenGL.glAttachShader(program, vertexShader);
OpenGL.CheckGLError();
OpenGL.glAttachShader(program, fragmentShader);
@@ -135,6 +141,7 @@ namespace OpenRA.Platforms.Default
{
VerifyThreadAffinity();
OpenGL.glUseProgram(program);
OpenGL.CheckGLError();
// bind the textures
foreach (var kv in textures)

57
OpenRA.Platforms.Default/Texture.cs
View File

@@ -85,7 +85,8 @@ namespace OpenRA.Platforms.Default
{
var intPtr = new IntPtr((void*)ptr);
PrepareTexture();
OpenGL.glTexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_RGBA8, width, height,
var glInternalFormat = OpenGL.Features.HasFlag(OpenGL.GLFeatures.GLES) ? OpenGL.GL_BGRA : OpenGL.GL_RGBA8;
OpenGL.glTexImage2D(OpenGL.GL_TEXTURE_2D, 0, glInternalFormat, width, height,
0, OpenGL.GL_BGRA, OpenGL.GL_UNSIGNED_BYTE, intPtr);
OpenGL.CheckGLError();
}
@@ -109,7 +110,8 @@ namespace OpenRA.Platforms.Default
{
var intPtr = new IntPtr((void*)ptr);
PrepareTexture();
OpenGL.glTexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_RGBA8, width, height,
var glInternalFormat = OpenGL.Features.HasFlag(OpenGL.GLFeatures.GLES) ? OpenGL.GL_BGRA : OpenGL.GL_RGBA8;
OpenGL.glTexImage2D(OpenGL.GL_TEXTURE_2D, 0, glInternalFormat, width, height,
0, OpenGL.GL_BGRA, OpenGL.GL_UNSIGNED_BYTE, intPtr);
OpenGL.CheckGLError();
}
@@ -121,19 +123,51 @@ namespace OpenRA.Platforms.Default
VerifyThreadAffinity();
var data = new byte[4 * Size.Width * Size.Height];
OpenGL.CheckGLError();
OpenGL.glBindTexture(OpenGL.GL_TEXTURE_2D, texture);
unsafe
// GLES doesn't support glGetTexImage so data must be read back via a frame buffer
if (OpenGL.Features.HasFlag(OpenGL.GLFeatures.GLES))
{
fixed (byte* ptr = &data[0])
// Query the active framebuffer so we can restore it afterwards
int lastFramebuffer;
OpenGL.glGetIntegerv(OpenGL.GL_FRAMEBUFFER_BINDING, out lastFramebuffer);
uint framebuffer;
OpenGL.glGenFramebuffers(1, out framebuffer);
OpenGL.glBindFramebuffer(OpenGL.GL_FRAMEBUFFER, framebuffer);
OpenGL.CheckGLError();
OpenGL.glFramebufferTexture2D(OpenGL.GL_FRAMEBUFFER, OpenGL.GL_COLOR_ATTACHMENT0, OpenGL.GL_TEXTURE_2D, texture, 0);
OpenGL.CheckGLError();
unsafe
{
var intPtr = new IntPtr((void*)ptr);
OpenGL.glGetTexImage(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_BGRA,
OpenGL.GL_UNSIGNED_BYTE, intPtr);
fixed (byte* ptr = &data[0])
{
var intPtr = new IntPtr((void*)ptr);
OpenGL.glReadPixels(0, 0, Size.Width, Size.Height, OpenGL.GL_BGRA, OpenGL.GL_UNSIGNED_BYTE, intPtr);
OpenGL.CheckGLError();
}
}
OpenGL.glBindFramebuffer(OpenGL.GL_FRAMEBUFFER, (uint)lastFramebuffer);
OpenGL.glDeleteFramebuffers(1, ref framebuffer);
OpenGL.CheckGLError();
}
else
{
OpenGL.glBindTexture(OpenGL.GL_TEXTURE_2D, texture);
unsafe
{
fixed (byte* ptr = &data[0])
{
var intPtr = new IntPtr((void*)ptr);
OpenGL.glGetTexImage(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_BGRA,
OpenGL.GL_UNSIGNED_BYTE, intPtr);
}
}
OpenGL.CheckGLError();
}
OpenGL.CheckGLError();
return data;
}
@@ -145,7 +179,8 @@ namespace OpenRA.Platforms.Default
Size = new Size(width, height);
PrepareTexture();
OpenGL.glTexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_RGBA8, width, height,
var glInternalFormat = OpenGL.Features.HasFlag(OpenGL.GLFeatures.GLES) ? OpenGL.GL_BGRA : OpenGL.GL_RGBA8;
OpenGL.glTexImage2D(OpenGL.GL_TEXTURE_2D, 0, glInternalFormat, width, height,
0, OpenGL.GL_BGRA, OpenGL.GL_UNSIGNED_BYTE, IntPtr.Zero);
OpenGL.CheckGLError();
}