From 133d07d5e7781c86cc11cd86e80ad1ff5325fc36 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Sun, 6 Apr 2025 18:19:16 +0100
Subject: add nelson transparency

---
 src/all.c | 53 +++++++++++++++++++++++++----------------------------
 1 file changed, 25 insertions(+), 28 deletions(-)

(limited to 'src/all.c')

diff --git a/src/all.c b/src/all.c
index 7ed292e..87b9b56 100644
--- a/src/all.c
+++ b/src/all.c
@@ -101,6 +101,7 @@ static const Button buttons[N_BUTTONS] = {
 	[BUTTON_CONTINUE] = {.x = BUTTON_SPACING, .y = BUTTON_SPACER(BUTTON_CONTINUE), .w = BUTTON_SIZE, .h = BUTTON_SIZE},
 };
 
+// This returns a positive color index or a negated image index
 static int getPlaceAction(int currentColor, int cellx, int celly, float cellWidth, float cellHeight) {
 	int hoverColor = EMPTY;
 
@@ -134,35 +135,16 @@ static DrawList *render(State *state, UI *ui, Arena *a) {
 
 	for (int x = 0; x < GRIDWIDTH; x++) {
 		for (int y = 0; y < GRIDHEIGHT; y++) {
-			int image;
-			switch (state->grid[x + GRIDWIDTH * y]) {
-				case RED:
-					image = IMAGE_NELSON;
-					break;
-				case RED_LEFT:
-					image = IMAGE_NELSON_LEFT;
-					break;
-				case RED_UP:
-					image = IMAGE_NELSON_UP;
-					break;
-				case RED_RIGHT:
-					image = IMAGE_NELSON_RIGHT;
-					break;
-				case RED_DOWN:
-					image = IMAGE_NELSON_DOWN;
-					break;
-				default:
-					image = 0;
-					break;
-			}
-
-			if (image) {
+			if (colorImages[state->grid[x + GRIDWIDTH * y]]) {
 				drawList->els[drawList->len++] = (DrawElement) {
 					.x = cellWidth * x + GRID_OFFSET_X,
 					.y = cellHeight * y,
 					.w = cellWidth,
 					.h = cellHeight,
-					.image = image,
+					.image = (ImageRef) {
+						.index = colorImages[state->grid[x + GRIDWIDTH * y]],
+						.opacity = 255,
+					},
 				};
 			} else {
 				for (int subx = 0; subx < 2; subx++) {
@@ -228,7 +210,18 @@ static DrawList *render(State *state, UI *ui, Arena *a) {
 			cellHeight
 		);
 
-		if (hoverColor != EMPTY) {
+		if (colorImages[hoverColor]) {
+			drawList->els[drawList->len++] = (DrawElement) {
+				.x = cellWidth * hoverx + GRID_OFFSET_X,
+				.y = cellHeight * hovery,
+				.w = cellWidth,
+				.h = cellHeight,
+				.image = {
+					.index = colorImages[hoverColor],
+					.opacity = 127,
+				},
+			};
+		} else if (hoverColor != EMPTY) {
 			int subCellWidth = cellWidth / 2;
 			int subCellHeight = cellHeight / 2;
 			for (int subx = 0; subx < 2; subx++) {
@@ -291,7 +284,10 @@ static DrawList *render(State *state, UI *ui, Arena *a) {
 			.y = ui->height - buttons[i].y,
 			.w = buttons[i].w,
 			.h = buttons[i].h,
-			.image = image,
+			.image = (ImageRef) {
+				.index = image,
+				.opacity = 255,
+			},
 		};
 	}
 
@@ -566,8 +562,9 @@ int main(int argc, char **argv) {
 			);
 			SDL_RenderRect(r, &rect);
 
-			if (drawList->els[i].image != 0) {
-				SDL_RenderTexture(r, textures[drawList->els[i].image], NULL, &rect);
+			if (drawList->els[i].image.index != 0) {
+				SDL_SetTextureAlphaMod(textures[(int) drawList->els[i].image.index], drawList->els[i].image.opacity);
+				SDL_RenderTexture(r, textures[(int) drawList->els[i].image.index], NULL, &rect);
 			}
 		}
 
-- 
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