M src/gba/gba-video.h → src/gba/gba-video.h

@@ -143,6 +143,9 @@
 	uint16_t* palette;
 	uint16_t* vram;
 	union GBAOAM* oam;
+
+	int framesPending;
+	int turbo;
 };
 
 struct GBAVideo {

M src/gba/renderers/video-software.c → src/gba/renderers/video-software.c

@@ -26,6 +26,9 @@ renderer->d.writeVideoRegister = GBAVideoSoftwareRendererWriteVideoRegister;
 	renderer->d.drawScanline = GBAVideoSoftwareRendererDrawScanline;
 	renderer->d.finishFrame = GBAVideoSoftwareRendererFinishFrame;
 
+	renderer->d.turbo = 0;
+	renderer->d.framesPending = 0;
+
 	renderer->sortedBg[0] = &renderer->bg[0];
 	renderer->sortedBg[1] = &renderer->bg[1];
 	renderer->sortedBg[2] = &renderer->bg[2];
@@ -170,7 +173,10 @@ static void GBAVideoSoftwareRendererFinishFrame(struct GBAVideoRenderer* renderer) {
 	struct GBAVideoSoftwareRenderer* softwareRenderer = (struct GBAVideoSoftwareRenderer*) renderer;
 
 	pthread_mutex_lock(&softwareRenderer->mutex);
-	pthread_cond_wait(&softwareRenderer->cond, &softwareRenderer->mutex);
+	renderer->framesPending++;
+	if (!renderer->turbo) {
+		pthread_cond_wait(&softwareRenderer->cond, &softwareRenderer->mutex);
+	}
 	pthread_mutex_unlock(&softwareRenderer->mutex);
 }
 

M src/main.c → src/main.c

@@ -110,8 +110,13 @@ glBindTexture(GL_TEXTURE_2D, renderer->tex);
 		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5, 256, 256, 0, GL_RGBA, GL_UNSIGNED_SHORT_1_5_5_5_REV, renderer->d.outputBuffer);
 		glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
 
-		SDL_GL_SwapBuffers();
 		pthread_mutex_lock(&renderer->d.mutex);
+		if (renderer->d.d.framesPending) {
+			--renderer->d.d.framesPending;
+			pthread_mutex_unlock(&renderer->d.mutex);
+			SDL_GL_SwapBuffers();
+			pthread_mutex_lock(&renderer->d.mutex);
+		}
 		pthread_cond_broadcast(&renderer->d.cond);
 		pthread_mutex_unlock(&renderer->d.mutex);
 		while (SDL_PollEvent(&event)) {
@@ -168,6 +173,9 @@ break;
 	case SDLK_RIGHT:
 		key = GBA_KEY_RIGHT;
 		break;
+	case SDLK_TAB:
+		context->renderer->turbo = !context->renderer->turbo;
+		return;
 	default:
 		return;
 	}