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fixed: Delay setup of quad-buffered stereo 3d mode, in case a useful OpenGL context is not immediately provided.

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This commit is contained in:
Christopher Bruns 2016-09-10 12:20:45 -04:00 committed by Christoph Oelckers
parent 66c5121e38
commit 924aaa3a92
2 changed files with 41 additions and 11 deletions
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50
src/gl/stereo3d/gl_quadstereo.cpp
View file

@ -45,17 +45,38 @@ QuadStereo::QuadStereo(double ipdMeters)
// Check whether quad-buffered stereo is supported in the current context
// We are assuming the OpenGL context is already current at this point,
// i.e. this constructor is called "just in time".
GLboolean supportsStereo, supportsBuffered;
glGetBooleanv(GL_STEREO, &supportsStereo);
glGetBooleanv(GL_DOUBLEBUFFER, &supportsBuffered);
bQuadStereoSupported = supportsStereo && supportsBuffered;
leftEye.bQuadStereoSupported = bQuadStereoSupported;
rightEye.bQuadStereoSupported = bQuadStereoSupported;
eye_ptrs.Push(&leftEye);
// If stereo is not supported, just draw scene once (left eye view only)
if (bQuadStereoSupported) {
eye_ptrs.Push(&rightEye);
// First initialize to mono-ish initial state
bQuadStereoSupported = leftEye.bQuadStereoSupported = rightEye.bQuadStereoSupported = false;
eye_ptrs.Push(&leftEye); // We ALWAYS want to show at least this one view...
// We will possibly advance to true stereo mode in the Setup() method...
}
// Sometimes the stereo render context is not ready immediately at start up
/* private */
void QuadStereo::checkInitialRenderContextState()
{
// Keep trying until we see at least one good OpenGL context to render to
static bool bDecentContextWasFound = false;
if (!bDecentContextWasFound) {
// I'm using a "random" OpenGL call (glGetFramebufferAttachmentParameteriv)
// that appears to correlate with whether the context is ready
GLint attachmentType = GL_NONE;
glGetFramebufferAttachmentParameteriv(GL_DRAW_FRAMEBUFFER, GL_FRONT_LEFT, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &attachmentType);
if (attachmentType != GL_NONE) // Finally, a useful OpenGL context
{
// This block will be executed exactly ONCE during a game run
bDecentContextWasFound = true; // now we can stop checking every frame...
// Now check whether this context supports hardware stereo
GLboolean supportsStereo, supportsBuffered;
glGetBooleanv(GL_STEREO, &supportsStereo);
glGetBooleanv(GL_DOUBLEBUFFER, &supportsBuffered);
bQuadStereoSupported = supportsStereo && supportsBuffered;
leftEye.bQuadStereoSupported = bQuadStereoSupported;
rightEye.bQuadStereoSupported = bQuadStereoSupported;
if (bQuadStereoSupported)
eye_ptrs.Push(&rightEye); // Use the other eye too, if we can do stereo
}
}
}
@ -81,11 +102,18 @@ void QuadStereo::Present() const
{
GLRenderer->mBuffers->BindOutputFB();
GLRenderer->ClearBorders();
GLRenderer->mBuffers->BindEyeTexture(1, 0);
GLRenderer->mBuffers->BindEyeTexture(0, 0);
GLRenderer->DrawPresentTexture(GLRenderer->mOutputLetterbox, true);
}
}
void QuadStereo::SetUp() const
{
Stereo3DMode::SetUp();
// Maybe advance to true stereo mode (ONCE), after the stereo context is finally ready
const_cast<QuadStereo*>(this)->checkInitialRenderContextState();
}
/* static */
const QuadStereo& QuadStereo::getInstance(float ipd)
{

2
src/gl/stereo3d/gl_quadstereo.h
View file

@ -69,11 +69,13 @@ class QuadStereo : public Stereo3DMode
public:
QuadStereo(double ipdMeters);
void Present() const override;
void SetUp() const override;
static const QuadStereo& getInstance(float ipd);
private:
QuadStereoLeftPose leftEye;
QuadStereoRightPose rightEye;
bool bQuadStereoSupported;
void checkInitialRenderContextState();
};