Shiny orb

What could it be?

app_render.cpp

@@ -4,10 +4,17 @@
 #include "physics.h"
 #include "easyx.h"
 #include "util/tree.h"
+#include "types.h"
+#include "render_util.h"
 #include <math.h>
 #include <graphics.h>
 
 
+namespace {
+TimePoint since = time_Now();
+} // namespace
+
+
 extern "C" {
 
 
@@ -30,5 +37,14 @@ void app_Render(App *app) {
 				(int)round(box.lefttop.y + box.size.y));
 		}
 	}
+
+	static FillMode mode_rotate = {
+		.rotate = Duration{.microseconds = 100 * 1000}};
+
+
+	setfillcolor(RGB(255, 255, 255));
+	setbkcolor(RGB(0, 0, 0));
+	render_SetModes(mode_rotate, since);
+	render_FillCircleW(app, vec2(200, 100), 20);
 }
 }

render_pattern.c

@@ -2,16 +2,20 @@
 #include <math.h>
 
 
-BYTE *render_DissolvePattern(double progress) {
+BYTE *render_DissolvePatternOut(double progress) {
 	if (progress < .0)
 		progress = .0;
 	if (progress > 1.0)
 		progress = 1.0;
 
-	int index = round(progress * 65);
+	int index = round(progress * 64);
 	return (BYTE *)(render_DissolvePatternData + index * 8);
 }
 
+BYTE *render_DissolvePatternIn(double progress) {
+	return render_DissolvePatternOut(1.0 - progress);
+}
+
 
 // generated from test_generate_pattern.cpp
 char render_DissolvePatternData[520] =

render_pattern.h

@@ -3,8 +3,21 @@
 // for BYTE
 #include <minwindef.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 // Returns a dissolve pattern for the given progress in [0,1]
-BYTE *render_DissolvePattern(double progress);
+// From empty to full
+BYTE *render_DissolvePatternIn(double progress);
+// From full to empty
+BYTE *render_DissolvePatternOut(double progress);
+
 
 // The underlying data. 520 bytes
 extern char render_DissolvePatternData[520];
+
+
+#ifdef __cplusplus
+}
+#endif

render_util.cpp

@@ -52,21 +52,25 @@ const FillMode render_DefaultMode = {
 	.style    = BS_SOLID,
 	.hatch    = 0,
 	.rotate   = {.microseconds = 0},
-	.dissolve = {.microseconds = 0}};
+	.dissolve = {.microseconds = 0},
+	.fadein   = false};
 
 
 void render_SetModes(FillMode mode, TimePoint since) {
 	if (mode.dissolve.microseconds != 0) {
 		// Dissolve mode
 		double progress = duration_Seconds(time_Since(since)) / duration_Seconds(mode.dissolve);
-		setfillstyle(render_DissolvePattern(progress)); // progress is capped into [0,1] in this func
+		if (mode.fadein)
+			setfillstyle(render_DissolvePatternIn(progress)); // progress is capped into [0,1] in this func
+		else
+			setfillstyle(render_DissolvePatternOut(progress));
 		setrop2(R2_COPYPEN);
 		return;
 	}
 
 	if (mode.rotate.microseconds != 0) {
 		// Rotate mode
-		int steps = round(duration_Seconds(time_Since(since)) / duration_Seconds(mode.dissolve));
+		int steps = round(duration_Seconds(time_Since(since)) / duration_Seconds(mode.rotate));
 
 		static const long hatches[] = {HS_HORIZONTAL, HS_FDIAGONAL, HS_VERTICAL, HS_BDIAGONAL};
 		setfillstyle(BS_HATCHED, hatches[steps % 4], NULL);
@@ -79,11 +83,11 @@ void render_SetModes(FillMode mode, TimePoint since) {
 	setrop2(mode.rop2);
 }
 
-void render_FillScreen(FillMode mode, TimePoint since) {
+void render_FillScreen() {
 	solidrectangle(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
 }
 
-void render_FillRectW(App *app, Box2 rect, FillMode mode, TimePoint since) {
+void render_FillRectW(App *app, Box2 rect) {
 	if (app->camera)
 		rect = camera_TransformBox2(app->camera, rect);
 	else
@@ -95,7 +99,7 @@ void render_FillRectW(App *app, Box2 rect, FillMode mode, TimePoint since) {
 		(int)round(rect.lefttop.y + rect.size.y));
 }
 
-void render_FillCircleW(App *app, Vec2 center, double radius, FillMode mode, TimePoint since) {
+void render_FillCircleW(App *app, Vec2 center, double radius) {
 	if (app->camera) {
 		center = camera_TransformVec2(app->camera, center);
 		radius = camera_TransformSize(app->camera, vec2(radius, 0)).x; // TODO non-aspect scaling

render_util.h

@@ -42,6 +42,7 @@ typedef struct {
 	// Dissolve the entire screen in an animation in this
 	// amount of time. Overrides rotate, style & hatch
 	Duration dissolve;
+	bool     fadein; // Fade Into being full for true, fade out of otherwise
 } FillMode;
 
 // Default fill mode.
@@ -56,12 +57,12 @@ typedef struct _App App;
 void render_SetModes(FillMode mode, TimePoint since);
 
 // Fills the entire screen
-void render_FillScreen(FillMode mode, TimePoint since);
+void render_FillScreen();
 
 // Fills a rectangle in world coordinates
-void render_FillRectW(App *app, Box2 rect, FillMode mode, TimePoint since);
+void render_FillRectW(App *app, Box2 rect);
 // Fills a circle in world coordinates
-void render_FillCircleW(App *app, Vec2 center, double radius, FillMode mode, TimePoint since);
+void render_FillCircleW(App *app, Vec2 center, double radius);
 
 
 #ifdef __cplusplus