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Only read viewport if VR needs it for an update

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This commit is contained in:
Kp 2021-04-04 22:01:25 +00:00
parent 8cc8e80eae
commit 426621398f
1 changed files with 6 additions and 5 deletions
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11
similar/arch/ogl/ogl.cpp
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@ -140,7 +140,6 @@ static std::array<ogl_texture, 20000> ogl_texture_list;
static int ogl_texture_list_cur;
static GLboolean ogl_stereo_enabled = false;
static std::array<GLint, 4> ogl_stereo_viewport;
static std::array<GLfloat, 16> ogl_stereo_transform;
/* some function prototypes */
@ -1289,7 +1288,7 @@ void ogl_start_frame(grs_canvas &canvas)
glLoadIdentity();//clear matrix
}
void ogl_stereo_frame(int xeye, int xoff)
void ogl_stereo_frame(const int xeye, const int xoff)
{
float dxoff = xoff * 2.0f / grd_curscreen->sc_canvas.cv_bitmap.bm_w;
@ -1300,11 +1299,12 @@ void ogl_stereo_frame(int xeye, int xoff)
// left eye view
if (ogl_stereo_enabled)
glDrawBuffer(GL_BACK_LEFT);
else {
else if (VR_stereo == STEREO_SIDE_BY_SIDE2)
{
std::array<GLint, 4> ogl_stereo_viewport;
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
// center unsqueezed side-by-side format
if (VR_stereo == STEREO_SIDE_BY_SIDE2)
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3]/2; // y = h/4
ogl_stereo_viewport[1] -= ogl_stereo_viewport[3]/2; // y = h/4
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
@ -1319,6 +1319,7 @@ void ogl_stereo_frame(int xeye, int xoff)
if (ogl_stereo_enabled)
glDrawBuffer(GL_BACK_RIGHT);
else {
std::array<GLint, 4> ogl_stereo_viewport;
glGetIntegerv(GL_VIEWPORT, ogl_stereo_viewport.data());
switch (VR_stereo) {
// center unsqueezed side-by-side format