gl,dx9,dx11: only render frame when Renderer::present() has been called

Issue #511

core/rend/dx11/dx11_driver.h

@@ -20,6 +20,7 @@
 #include "rend/imgui_driver.h"
 #include "imgui_impl_dx11.h"
 #include "dx11context.h"
+#include "rend/gui.h"
 
 class DX11Driver final : public ImGuiDriver
 {
@@ -30,9 +31,20 @@ public:
 
 	void renderDrawData(ImDrawData *drawData) override {
 		theDX11Context.EndImGuiFrame();
+		if (gui_is_open())
+			frameRendered = true;
 	}
 
 	void present() override {
-		theDX11Context.Present();
+		if (frameRendered)
+			theDX11Context.Present();
+		frameRendered = false;
 	}
+
+	void setFrameRendered() override {
+		frameRendered = true;
+	}
+
+private:
+	bool frameRendered = false;
 };

core/rend/dx11/dx11_renderer.h

@@ -27,6 +27,9 @@
 #include "dx11_shaders.h"
 #include "rend/sorter.h"
 #include "dx11_renderstate.h"
+#ifndef LIBRETRO
+#include "dx11_driver.h"
+#endif
 
 struct DX11Renderer : public Renderer
 {
@@ -41,6 +44,9 @@ struct DX11Renderer : public Renderer
 		if (!frameRendered)
 			return false;
 		frameRendered = false;
+#ifndef LIBRETRO
+		imguiDriver->setFrameRendered();
+#endif
 		return true;
 	}
 

core/rend/dx9/d3d_renderer.h

@@ -26,6 +26,7 @@
 #include "d3d_texture.h"
 #include "d3d_shaders.h"
 #include "rend/sorter.h"
+#include "rend/imgui_driver.h"
 
 class RenderStateCache
 {
@@ -108,6 +109,7 @@ struct D3DRenderer : public Renderer
 	{
 		if (!frameRendered)
 			return false;
+		imguiDriver->setFrameRendered();
 		frameRendered = false;
 		return true;
 	}

core/rend/dx9/dx9_driver.h

@@ -30,9 +30,20 @@ public:
 
 	void renderDrawData(ImDrawData *drawData) override {
 		theDXContext.EndImGuiFrame();
+		if (gui_is_open())
+			frameRendered = true;
 	}
 
 	void present() override {
-		theDXContext.Present();
+		if (frameRendered)
+			theDXContext.Present();
+		frameRendered = false;
 	}
+
+	void setFrameRendered() override {
+		frameRendered = true;
+	}
+
+private:
+	bool frameRendered = false;
 };

core/rend/gles/gles.cpp

@@ -4,7 +4,6 @@
 #include "hw/pvr/ta.h"
 #ifndef LIBRETRO
 #include "rend/gui.h"
-#include "opengl_driver.h"
 #else
 #include "vmu_xhair.h"
 #endif
@@ -1090,7 +1089,7 @@ void OSD_DRAW(bool clear_screen)
 			glDrawArrays(GL_TRIANGLE_STRIP, i * 4, 4);
 
 		glCheck();
-		((OpenGLDriver *)imguiDriver.get())->setFrameRendered();
+		imguiDriver->setFrameRendered();
 #ifndef GLES2
 		if (gl.gl_major >= 3)
 			glBindVertexArray(0);

core/rend/gles/gles.h

@@ -6,6 +6,9 @@
 #include "glcache.h"
 #include "postprocess.h"
 #include "rend/shader_util.h"
+#ifndef LIBRETRO
+#include "rend/imgui_driver.h"
+#endif
 
 #include <unordered_map>
 #include <glm/glm.hpp>
@@ -286,6 +289,9 @@ struct OpenGLRenderer : Renderer
 	{
 		if (!frameRendered)
 			return false;
+#ifndef LIBRETRO
+		imguiDriver->setFrameRendered();
+#endif
 		frameRendered = false;
 		return true;
 	}

core/rend/gles/opengl_driver.cpp

@@ -154,12 +154,12 @@ void OpenGLDriver::newFrame()
 void OpenGLDriver::renderDrawData(ImDrawData* drawData)
 {
 	ImGui_ImplOpenGL3_RenderDrawData(drawData);
-	frameRendered = true;
+	if (gui_is_open())
+		frameRendered = true;
 }
 
 void OpenGLDriver::present()
 {
-	// FIXME we only rely on whether some imgui stuff has been rendered, which is kinda weak
 	if (frameRendered)
 		theGLContext.swap();
 	frameRendered = false;

core/rend/gles/opengl_driver.h

@@ -33,7 +33,7 @@ public:
 	void renderDrawData(ImDrawData* drawData) override;
 	void present() override;
 
-	void setFrameRendered() {
+	void setFrameRendered() override {
 		frameRendered = true;
 	}
 

core/rend/imgui_driver.h

@@ -32,6 +32,7 @@ public:
 	virtual void displayCrosshairs() {}
 
 	virtual void present() = 0;
+	virtual void setFrameRendered() {}
 };
 
 extern std::unique_ptr<ImGuiDriver> imguiDriver;