texture

1 files changed, 65 insertions, 0 deletions

diff --git a/examples/texture.c b/examples/texture.c
new file mode 100644
index 0000000..06428de
--- /dev/null
+++ b/examples/texture.c
@@ -0,0 +1,65 @@
+#include <assert.h>
+
+#include "../sponge.h"
+#include "../stb_image.h"
+
+#define SPEED_X_ABS 2
+#define SPEED_Y_ABS 2
+
+sponge_Texture texture;
+
+int32_t pos_x;
+int32_t pos_y;
+int32_t speed_x;
+int32_t speed_y;
+
+void init() {
+    unsigned char *data = stbi_load("examples/kot.png", &texture.width, &texture.height, NULL, 4);
+    if (!data) {
+        printf("%s\n", stbi_failure_reason());
+        assert(0);
+    }
+
+    texture.stride = texture.width;
+    texture.pixels = data; // NOTE(kard): be careful if changing following loop
+
+    // converting from stbi's RGBA to ARGB
+    for (size_t i = 0; i < texture.width * texture.height; i++) {
+        uint32_t result = 0;
+        result |= data[i * 4 + 0] << 16; // R
+        result |= data[i * 4 + 1] << 8;  // G
+        result |= data[i * 4 + 2] << 0;  // B
+        result |= data[i * 4 + 3] << 24; // A
+        texture.pixels[i] = result;
+    }
+
+    pos_x = 20;
+    pos_y = 10;
+    speed_x = SPEED_X_ABS;
+    speed_y = SPEED_Y_ABS;
+}
+
+void draw_frame(sponge_Texture c) {
+    sponge_clear(c, 0xFF000000);
+
+    pos_x += speed_x;
+    pos_y += speed_y;
+
+    if (pos_x < 0) {
+        pos_x = 0;
+        speed_x = SPEED_X_ABS;
+    } else if (pos_x + texture.width > c.width) {
+        pos_x = c.width - texture.width;
+        speed_x = -SPEED_X_ABS;
+    }
+
+    if (pos_y < 0) {
+        pos_y = 0;
+        speed_y = SPEED_X_ABS;
+    } else if (pos_y + texture.height > c.height) {
+        pos_y = c.height - texture.height;
+        speed_y = -SPEED_Y_ABS;
+    }
+
+    sponge_draw_texture(c, pos_x, pos_y, texture);
+}