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Consolidate stereo GL calls

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Reorder the logic to unify the common calls at the bottom of the
function, and skip computing anything if called in no-stereo mode.
This commit is contained in:
Kp 2021-04-04 22:01:25 +00:00
parent 426621398f
commit 70ef749ff4
1 changed files with 20 additions and 19 deletions
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39
similar/arch/ogl/ogl.cpp
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@ -1290,16 +1290,18 @@ void ogl_start_frame(grs_canvas &canvas)
void ogl_stereo_frame(const int xeye, const int xoff)
{
float dxoff = xoff * 2.0f / grd_curscreen->sc_canvas.cv_bitmap.bm_w;
if (!xeye)
return;
const float dxoff = xoff * 2.0f / grd_curscreen->sc_canvas.cv_bitmap.bm_w;
float stereo_transform_dxoff;
// query if stereo quad buffering available?
glGetBooleanv(GL_STEREO, &ogl_stereo_enabled);
if (xeye < 0) {
const auto left_eye = xeye < 0;
if (left_eye) {
// left eye view
if (ogl_stereo_enabled)
glDrawBuffer(GL_BACK_LEFT);
else if (VR_stereo == STEREO_SIDE_BY_SIDE2)
if (!ogl_stereo_enabled && VR_stereo == STEREO_SIDE_BY_SIDE2)
{
std::array<GLint, 4> ogl_stereo_viewport;
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
@ -1308,17 +1310,13 @@ void ogl_stereo_frame(const int xeye, const int xoff)
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
glMatrixMode(GL_PROJECTION);
glGetFloatv(GL_PROJECTION_MATRIX, ogl_stereo_transform.data());
ogl_stereo_transform[8] -= dxoff; // xoff < 0
glLoadMatrixf(ogl_stereo_transform.data());
glMatrixMode(GL_MODELVIEW);
stereo_transform_dxoff = -dxoff; // xoff < 0
}
else if (xeye > 0) {
else
{
// right eye view
if (ogl_stereo_enabled)
glDrawBuffer(GL_BACK_RIGHT);
else {
if (!ogl_stereo_enabled)
{
std::array<GLint, 4> ogl_stereo_viewport;
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
switch (VR_stereo) {
@ -1338,12 +1336,15 @@ void ogl_stereo_frame(const int xeye, const int xoff)
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
glMatrixMode(GL_PROJECTION);
glGetFloatv(GL_PROJECTION_MATRIX, ogl_stereo_transform.data());
ogl_stereo_transform[8] += dxoff; // xoff < 0
glLoadMatrixf(ogl_stereo_transform.data());
glMatrixMode(GL_MODELVIEW);
stereo_transform_dxoff = dxoff; // xoff < 0
}
if (ogl_stereo_enabled)
glDrawBuffer(left_eye ? GL_BACK_LEFT : GL_BACK_RIGHT);
glMatrixMode(GL_PROJECTION);
glGetFloatv(GL_PROJECTION_MATRIX, ogl_stereo_transform.data());
ogl_stereo_transform[8] += stereo_transform_dxoff;
glLoadMatrixf(ogl_stereo_transform.data());
glMatrixMode(GL_MODELVIEW);
}
void ogl_end_frame(void){