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Avoid reloading GL viewport unnecessarily in stereo mode

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This commit is contained in:
Kp 2021-09-12 16:20:52 +00:00
parent 7f51fa3ac5
commit d257d032f4
1 changed files with 42 additions and 33 deletions
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75
similar/arch/ogl/ogl.cpp
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@ -139,9 +139,6 @@ static int r_polyc,r_tpolyc,r_bitmapc,r_ubitbltc;
static std::array<ogl_texture, 20000> ogl_texture_list;
static int ogl_texture_list_cur;
static GLboolean ogl_stereo_enabled = false;
static std::array<GLfloat, 16> ogl_stereo_transform;
/* some function prototypes */
#define GL_TEXTURE0_ARB 0x84C0
@ -1300,34 +1297,43 @@ void ogl_stereo_frame(const int xeye, const int xoff)
float stereo_transform_dxoff;
// query if stereo quad buffering available?
GLboolean ogl_stereo_enabled = false;
glGetBooleanv(GL_STEREO, &ogl_stereo_enabled);
const auto left_eye = xeye < 0;
int gl_buffer;
if (left_eye) {
// left eye view
if (!ogl_stereo_enabled)
{
std::array<GLint, 4> ogl_stereo_viewport;
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
// center unsqueezed side-by-side format
switch (VR_stereo) {
case StereoFormat::None:
case StereoFormat::AboveBelow:
case StereoFormat::SideBySideFullHeight:
break;
case StereoFormat::SideBySideHalfHeight:
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3]/2; // y = h/4
break;
case StereoFormat::AboveBelowSync:
int dy = VR_sync_width/2;
ogl_stereo_viewport[3] -= dy;
ogl_stereo_viewport[1] += dy;
break;
}
glViewport(ogl_stereo_viewport[0], ogl_stereo_viewport[1], ogl_stereo_viewport[2], ogl_stereo_viewport[3]);
[]() {
std::array<GLint, 4> ogl_stereo_viewport;
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
// center unsqueezed side-by-side format
switch (VR_stereo) {
case StereoFormat::None:
/* Not reached */
case StereoFormat::AboveBelow:
case StereoFormat::SideBySideFullHeight:
/* No modification needed */
return;
case StereoFormat::SideBySideHalfHeight:
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3] / 2; // y = h/4
break;
case StereoFormat::AboveBelowSync:
{
const int dy = VR_sync_width / 2;
ogl_stereo_viewport[3] -= dy;
ogl_stereo_viewport[1] += dy;
break;
}
}
glViewport(ogl_stereo_viewport[0], ogl_stereo_viewport[1], ogl_stereo_viewport[2], ogl_stereo_viewport[3]);
}();
}
// rightward image shift adjustment for left eye offset
stereo_transform_dxoff = -dxoff; // xoff < 0
gl_buffer = GL_BACK_LEFT;
}
else
{
@ -1338,31 +1344,34 @@ void ogl_stereo_frame(const int xeye, const int xoff)
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
switch (VR_stereo) {
case StereoFormat::None:
/* Not reached */
break;
// center unsqueezed side-by-side format
// center unsqueezed side-by-side format
case StereoFormat::SideBySideHalfHeight:
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3]/2; // y = h/4
DXX_BOOST_FALLTHROUGH;
// half-width viewports for side-by-side format
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3] / 2; // y = h/4
DXX_BOOST_FALLTHROUGH;
// half-width viewports for side-by-side format
case StereoFormat::SideBySideFullHeight:
ogl_stereo_viewport[0] += ogl_stereo_viewport[2]; // x = w/2
break;
// half-height viewports for above/below format
ogl_stereo_viewport[0] += ogl_stereo_viewport[2]; // x = w/2
break;
// half-height viewports for above/below format
case StereoFormat::AboveBelowSync:
case StereoFormat::AboveBelow:
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3]; // y = h/2
if (VR_stereo == StereoFormat::AboveBelowSync)
ogl_stereo_viewport[3] -= VR_sync_width/2;
break;
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3]; // y = h/2
if (VR_stereo == StereoFormat::AboveBelowSync)
ogl_stereo_viewport[3] -= VR_sync_width / 2;
break;
}
glViewport(ogl_stereo_viewport[0], ogl_stereo_viewport[1], ogl_stereo_viewport[2], ogl_stereo_viewport[3]);
}
// leftward image shift adjustment for right eye offset
stereo_transform_dxoff = dxoff; // xoff < 0
gl_buffer = GL_BACK_RIGHT;
}
if (ogl_stereo_enabled)
glDrawBuffer(left_eye ? GL_BACK_LEFT : GL_BACK_RIGHT);
glDrawBuffer(gl_buffer);
glMatrixMode(GL_PROJECTION);
std::array<GLfloat, 16> ogl_stereo_transform;
glGetFloatv(GL_PROJECTION_MATRIX, ogl_stereo_transform.data());
ogl_stereo_transform[8] += stereo_transform_dxoff;
glLoadMatrixf(ogl_stereo_transform.data());