- added support for softpoly backend on macOS

Grabbed most of code from old Cocoa backend with separate code path for software rendering

src/posix/cocoa/i_video.mm

@@ -57,6 +57,7 @@
 
 #include "gl/system/gl_framebuffer.h"
 #include "vulkan/system/vk_framebuffer.h"
+#include "rendering/polyrenderer/backend/poly_framebuffer.h"
 
 
 @implementation NSWindow(ExitAppOnClose)
@@ -293,7 +294,13 @@ -(BOOL) isOpaque
 	return window;
 }
 
-NSOpenGLPixelFormat* CreatePixelFormat()
+enum class OpenGLProfile
+{
+	Core,
+	Legacy
+};
+
+NSOpenGLPixelFormat* CreatePixelFormat(const OpenGLProfile profile)
 {
 	NSOpenGLPixelFormatAttribute attributes[16];
 	size_t i = 0;
@@ -305,22 +312,28 @@ -(BOOL) isOpaque
 	attributes[i++] = NSOpenGLPixelFormatAttribute(24);
 	attributes[i++] = NSOpenGLPFAStencilSize;
 	attributes[i++] = NSOpenGLPixelFormatAttribute(8);
-	attributes[i++] = NSOpenGLPFAOpenGLProfile;
-	attributes[i++] = NSOpenGLProfileVersion3_2Core;
-
+
+	if (profile == OpenGLProfile::Core)
+	{
+		attributes[i++] = NSOpenGLPFAOpenGLProfile;
+		attributes[i++] = NSOpenGLProfileVersion3_2Core;
+	}
+
 	if (!vid_autoswitch)
 	{
 		attributes[i++] = NSOpenGLPFAAllowOfflineRenderers;
 	}
 
 	attributes[i] = NSOpenGLPixelFormatAttribute(0);
 
+	assert(i < sizeof attributes / sizeof attributes[0]);
+
 	return [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
 }
 
-void SetupOpenGLView(CocoaWindow* window)
+void SetupOpenGLView(CocoaWindow* const window, const OpenGLProfile profile)
 {
-	NSOpenGLPixelFormat* pixelFormat = CreatePixelFormat();
+	NSOpenGLPixelFormat* pixelFormat = CreatePixelFormat(profile);
 
 	if (nil == pixelFormat)
 	{
@@ -364,13 +377,12 @@ void SetupOpenGLView(CocoaWindow* window)
 		assert(ms_window == nil);
 		ms_window = CreateWindow(STYLE_MASK_WINDOWED);
 
+		const NSRect contentRect = [ms_window contentRectForFrameRect:[ms_window frame]];
 		SystemBaseFrameBuffer *fb = nullptr;
 
 #ifdef HAVE_VULKAN
 		if (ms_isVulkanEnabled)
 		{
-			const NSRect contentRect = [ms_window contentRectForFrameRect:[ms_window frame]];
-
 			NSView* vulkanView = [[VulkanCocoaView alloc] initWithFrame:contentRect];
 			vulkanView.wantsLayer = YES;
 			vulkanView.layer.backgroundColor = NSColor.blackColor.CGColor;
@@ -417,13 +429,20 @@ void SetupOpenGLView(CocoaWindow* window)
 			{
 				ms_isVulkanEnabled = false;
 
-				SetupOpenGLView(ms_window);
+				SetupOpenGLView(ms_window, OpenGLProfile::Core);
 			}
 		}
 		else
 #endif
+		if (vid_preferbackend == 2)
 		{
-			SetupOpenGLView(ms_window);
+			SetupOpenGLView(ms_window, OpenGLProfile::Legacy);
+
+			fb = new PolyFrameBuffer(nullptr, fullscreen);
+		}
+		else
+		{
+			SetupOpenGLView(ms_window, OpenGLProfile::Core);
 		}
 
 		if (fb == nullptr)
@@ -603,9 +622,17 @@ void SetupOpenGLView(CocoaWindow* window)
 
 void SystemBaseFrameBuffer::SetMode(const bool fullscreen, const bool hiDPI)
 {
-	assert(m_window.screen != nil);
-	assert(m_window.contentView.layer != nil);
-	[m_window.contentView layer].contentsScale = hiDPI ? m_window.screen.backingScaleFactor : 1.0;
+	if ([m_window.contentView isKindOfClass:[OpenGLCocoaView class]])
+	{
+		NSOpenGLView* const glView = [m_window contentView];
+		[glView setWantsBestResolutionOpenGLSurface:hiDPI];
+	}
+	else
+    {
+		assert(m_window.screen != nil);
+		assert(m_window.contentView.layer != nil);
+		[m_window.contentView layer].contentsScale = hiDPI ? m_window.screen.backingScaleFactor : 1.0;
+	}
 
 	if (fullscreen)
 	{
@@ -956,19 +983,90 @@ bool I_CreateVulkanSurface(VkInstance instance, VkSurfaceKHR *surface)
 }
 #endif
 
+
+namespace
+{
+	TArray<uint8_t> polyPixelBuffer;
+	GLuint polyTexture;
+
+	int polyWidth = -1;
+	int polyHeight = -1;
+	int polyVSync = -1;
+}
+
 void I_PolyPresentInit()
 {
+	ogl_LoadFunctions();
+
+	glGenTextures(1, &polyTexture);
+	assert(polyTexture != 0);
+
+	glEnable(GL_TEXTURE_RECTANGLE_ARB);
+	glBindTexture(GL_TEXTURE_RECTANGLE_ARB, polyTexture);
+
+	glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 }
 
 uint8_t *I_PolyPresentLock(int w, int h, bool vsync, int &pitch)
 {
-	return nullptr;
+	static const int PIXEL_BYTES = 4;
+
+	if (polyPixelBuffer.Size() == 0 || w != polyWidth || h != polyHeight)
+	{
+		polyPixelBuffer.Resize(w * h * PIXEL_BYTES);
+
+		polyWidth = w;
+		polyHeight = h;
+
+		glMatrixMode(GL_MODELVIEW);
+		glLoadIdentity();
+		glMatrixMode(GL_PROJECTION);
+		glLoadIdentity();
+		glOrtho(0.0, w, h, 0.0, -1.0, 1.0);
+
+		glViewport(0, 0, w, h);
+	}
+
+	if (vsync != polyVSync)
+	{
+		const GLint value = vsync ? 1 : 0;
+
+		[[NSOpenGLContext currentContext] setValues:&value
+									   forParameter:NSOpenGLCPSwapInterval];
+	}
+
+	pitch = w * PIXEL_BYTES;
+
+	return &polyPixelBuffer[0];
 }
 
 void I_PolyPresentUnlock(int x, int y, int w, int h)
 {
+	glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_BYTE, &polyPixelBuffer[0]);
+
+	glBegin(GL_QUADS);
+	glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
+	glTexCoord2f(0.0f, 0.0f);
+	glVertex2f(0.0f, 0.0f);
+	glTexCoord2f(w, 0.0f);
+	glVertex2f(w, 0.0f);
+	glTexCoord2f(w, h);
+	glVertex2f(w, h);
+	glTexCoord2f(0.0f, h);
+	glVertex2f(0.0f, h);
+	glEnd();
+
+	glFlush();
+
+	[[NSOpenGLContext currentContext] flushBuffer];
 }
 
 void I_PolyPresentDeinit()
 {
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glDeleteTextures(1, &polyTexture);
 }