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opengl: work around Retina issue on macOS Catalina until SDL catches up [R. Belmont]

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This commit is contained in:
arbee 2019-11-16 20:48:29 -05:00
parent 6357b2f7c2
commit d62c353771
1 changed files with 39 additions and 1 deletions
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40
src/osd/modules/render/drawogl.cpp
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@ -41,6 +41,11 @@
#include "modules/opengl/gl_shader_mgr.h"
#if defined(SDLMAME_MACOSX) || defined(OSD_MAC)
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#ifndef APIENTRY
#define APIENTRY
#endif
@ -1116,7 +1121,40 @@ int renderer_ogl::draw(const int update)
// |_________|
// (0,h) (w,h)
glViewport(0.0, 0.0, (GLsizei) m_width, (GLsizei) m_height);
GLsizei iScale = 1;
/*
Mac hack: macOS version 10.15 and later flipped from assuming you don't support Retina to
assuming you do support Retina. SDL 2.0.11 is scheduled to fix this, but it's not out yet.
So we double-scale everything if you're on 10.15 or later and SDL is not at least version 2.0.11.
*/
#if defined(SDLMAME_MACOSX) || defined(OSD_MAC)
SDL_version sdlVers;
SDL_GetVersion(&sdlVers);
// Only do this if SDL is not at least 2.0.11.
if ((sdlVers.major == 2) && (sdlVers.minor == 0) && (sdlVers.patch < 11))
{
// now get the Darwin kernel version
int dMaj, dMin, dPatch;
char versStr[64];
dMaj = dMin = dPatch = 0;
size_t size = sizeof(versStr);
int retVal = sysctlbyname("kern.osrelease", versStr, &size, NULL, 0);
if (retVal == 0)
{
sscanf(versStr, "%d.%d.%d", &dMaj, &dMin, &dPatch);
// 10.15 Catalina is Darwin version 19
if (dMaj >= 19)
{
// do the workaround for Retina being forced on
osd_printf_verbose("OpenGL: enabling Retina workaround\n");
iScale = 2;
}
}
}
#endif
glViewport(0.0, 0.0, (GLsizei) m_width * iScale, (GLsizei) m_height * iScale);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, (GLdouble) m_width, (GLdouble) m_height, 0.0, 0.0, -1.0);