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-rw-r--r--src/modules/drizzle/drizzle.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/src/modules/drizzle/drizzle.c b/src/modules/drizzle/drizzle.c
index fff59bd..57b2664 100644
--- a/src/modules/drizzle/drizzle.c
+++ b/src/modules/drizzle/drizzle.c
@@ -43,6 +43,7 @@ typedef struct drizzle_setup_t {
typedef struct drizzle_context_t {
til_module_context_t til_module_context;
+ til_fb_fragment_t *snapshot;
puddle_t *puddle;
drizzle_setup_t setup;
} drizzle_context_t;
@@ -127,6 +128,31 @@ static void drizzle_prepare_frame(til_module_context_t *context, unsigned ticks,
}
puddle_tick(ctxt->puddle, ctxt->setup.viscosity);
+
+ if ((*fragment_ptr)->cleared)
+ ctxt->snapshot = til_fb_fragment_snapshot(fragment_ptr, 0);
+}
+
+
+/* TODO: this probably should also go through a gamma correction */
+static inline uint32_t pixel_mult_scalar(uint32_t pixel, float t)
+{
+ float r, g, b;
+
+ if (t > 1.f)
+ t = 1.f;
+ if (t < 0.f)
+ t = 0.f;
+
+ r = (pixel >> 16) & 0xff;
+ g = (pixel >> 8) & 0xff;
+ b = (pixel & 0xff);
+
+ r *= t;
+ g *= t;
+ b *= t;
+
+ return ((uint32_t)r) << 16 | ((uint32_t)g) << 8 | ((uint32_t)b);
}
@@ -139,6 +165,26 @@ static void drizzle_render_fragment(til_module_context_t *context, unsigned tick
float yf = 1.f / (float)fragment->frame_height;
v2f_t coord;
+ if (ctxt->snapshot) {
+ coord.y = yf * (float)fragment->y;
+ for (int y = fragment->y; y < fragment->y + fragment->height; y++) {
+
+ coord.x = xf * (float)fragment->x;
+ for (int x = fragment->x; x < fragment->x + fragment->width; x++) {
+ float t = puddle_sample(ctxt->puddle, &coord);
+ uint32_t pixel = pixel_mult_scalar(til_fb_fragment_get_pixel_unchecked(ctxt->snapshot, x, y), t);
+
+ til_fb_fragment_put_pixel_unchecked(fragment, 0, x, y, pixel);
+
+ coord.x += xf;
+ }
+
+ coord.y += yf;
+ }
+
+ return;
+ }
+
coord.y = yf * (float)fragment->y;
for (int y = fragment->y; y < fragment->y + fragment->height; y++) {
@@ -160,6 +206,15 @@ static void drizzle_render_fragment(til_module_context_t *context, unsigned tick
}
+static void drizzle_finish_frame(til_module_context_t *context, unsigned int ticks, til_fb_fragment_t **fragment_ptr)
+{
+ drizzle_context_t *ctxt = (drizzle_context_t *)context;
+
+ if (ctxt->snapshot)
+ ctxt->snapshot = til_fb_fragment_reclaim(ctxt->snapshot);
+}
+
+
static int drizzle_setup(const til_settings_t *settings, til_setting_t **res_setting, const til_setting_desc_t **res_desc, til_setup_t **res_setup)
{
const char *viscosity;
@@ -208,8 +263,10 @@ til_module_t drizzle_module = {
.destroy_context = drizzle_destroy_context,
.prepare_frame = drizzle_prepare_frame,
.render_fragment = drizzle_render_fragment,
+ .finish_frame = drizzle_finish_frame,
.name = "drizzle",
.description = "Classic 2D rain effect (threaded (poorly))",
.author = "Vito Caputo <vcaputo@pengaru.com>",
.setup = drizzle_setup,
+ .flags = TIL_MODULE_OVERLAYABLE,
};
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