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TOpenGLControl: Improve reliability, raise exceptions telling what went wrong. Issue #30099, patch from Denis Golovan.

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git-svn-id: trunk@52285 -
This commit is contained in:
juha 2016-05-07 14:11:38 +00:00
parent 77b370efd9
commit 567e0bf562
1 changed files with 41 additions and 8 deletions
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49
components/opengl/glwin32wglcontext.pas
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@ -29,7 +29,7 @@ function LOpenGLCreateContext(AWinControl: TWinControl;
const AParams: TCreateParams): HWND;
procedure LOpenGLDestroyContextInfo(AWinControl: TWinControl);
procedure InitWGL;
procedure InitWGL(RequireWGL_ARB_create_context : boolean);
procedure InitOpenGLContextGLWindowClass;
@ -223,6 +223,7 @@ const
);
implementation
uses glext;
function GLGetProcAddress(ProcName: PChar):Pointer;
begin
@ -307,27 +308,39 @@ begin
0, 0, 100, 100,
0 { no parent window }, 0 { no menu }, hInstance,
nil);
if Temp_H_wnd=0 then
raise Exception.Create('LGlMsCreateTemporaryWindow CreateWindowEx failed');
{ create Temp_h_Dc }
Temp_h_Dc := GetDC(Temp_h_Wnd);
if Temp_h_Dc=0 then
raise Exception.Create('LGlMsCreateTemporaryWindow GetDC failed');
{ create and set PixelFormat (must support OpenGL to be able to
later do wglCreateContext) }
FillChar(pfd, SizeOf(pfd), 0);
with pfd do
begin
nSize := SizeOf(PIXELFORMATDESCRIPTOR);
nSize := SizeOf(pfd);
nVersion := 1;
dwFlags := PFD_DRAW_TO_WINDOW or PFD_SUPPORT_OPENGL;
dwFlags := PFD_DRAW_TO_WINDOW or PFD_SUPPORT_OPENGL or PFD_DOUBLEBUFFER;
iPixelType := PFD_TYPE_RGBA;
iLayerType := PFD_MAIN_PLANE;
end;
PixelFormat := ChoosePixelFormat(Temp_h_Dc, @pfd);
SetPixelFormat(Temp_h_Dc, PixelFormat, @pfd);
if PixelFormat = 0 then
raise Exception.Create('LGlMsCreateTemporaryWindow ChoosePixelFormat failed');
if not SetPixelFormat(Temp_h_Dc, PixelFormat, @pfd) then
raise Exception.Create('LGlMsCreateTemporaryWindow SetPixelFormat failed');
{ create and make current Temp_h_GLRc }
Temp_h_GLRc := wglCreateContext(Temp_h_Dc);
wglMakeCurrent(Temp_h_Dc, Temp_h_GLRc);
if Temp_h_GLRc = 0 then
raise Exception.Create('LGlMsCreateTemporaryWindow wglCreateContext failed');
if not wglMakeCurrent(Temp_h_Dc, Temp_h_GLRc) then
raise Exception.Create('LGlMsCreateTemporaryWindow wglMakeCurrent failed');
except
{ make sure to finalize all partially initialized window parts }
LGlMsDestroyTemporaryWindow;
@ -426,7 +439,7 @@ var
FailReason : string;
attribList : array [0..2] of Integer;
begin
InitWGL;
InitWGL( DebugContext );
//InitOpenGLContextGLWindowClass;
// general initialization of Params
@ -550,7 +563,7 @@ begin
DisposeWGLControlInfo(Info^.Window);
end;
procedure InitWGL;
procedure InitWGL( RequireWGL_ARB_create_context : boolean );
var
Buffer: string;
@ -570,6 +583,9 @@ begin
already initialized. We create a temporary window for this purpose. }
LGlMsCreateTemporaryWindow;
if wglGetCurrentContext() = 0 then
raise Exception.Create('Context is not active');
// ARB wgl extensions
Pointer(wglCreateContextAttribsARB) := GLGetProcAddress('wglCreateContextAttribsARB');
Pointer(wglGetExtensionsStringARB) := GLGetProcAddress('wglGetExtensionsStringARB');
@ -611,7 +627,24 @@ begin
DebugLn('InitWGL ',E.Message);
end;
end;
LGlMsDestroyTemporaryWindow;
try
if RequireWGL_ARB_create_context then
begin
if wglGetExtensionsStringARB = nil then
raise Exception.Create('InitWGL : wglGetExtensionsStringARB = nil');
if not CheckExtension('WGL_ARB_create_context') then
begin
raise Exception.CreateFmt('InitWGL : WGL_ARB_create_context not found. Version %s Renderer=%s'
+ sLineBreak + 'Extensions found:' + sLineBreak + '%s',
[String(glGetString(GL_VERSION)), String(glGetString(GL_RENDERER)), Buffer]);
end;
if wglCreateContextAttribsARB = nil then
raise Exception.Create('InitWGL : wglCreateContextAttribsARB = nil');
end;
finally
LGlMsDestroyTemporaryWindow;
end;
end;
procedure InitOpenGLContextGLWindowClass;