initial

zephr/texture.odin

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+package zephr
+
+import gl "vendor:OpenGL"
+import stb "vendor:stb/image"
+
+TextureId :: u32
+
+load_texture :: proc(path: cstring) -> TextureId {
+  texture_id: TextureId;
+  width, height, channels: i32
+  data := stb.load(path, &width, &height, &channels, 4) // RGBA
+  defer stb.image_free(data)
+
+  format := gl.RGBA;
+
+  switch (channels) {
+    case 1:
+      format = gl.RED;
+      break;
+    case 2:
+      format = gl.RG;
+      break;
+    case 3:
+      format = gl.RGB;
+      break;
+    case 4:
+      format = gl.RGBA;
+      break;
+  }
+
+  gl.GenTextures(1, &texture_id);
+  gl.BindTexture(gl.TEXTURE_2D, texture_id);
+
+  gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
+  gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
+
+  gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
+  gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
+
+  gl.TexImage2D(gl.TEXTURE_2D, 0, cast(i32)format, width, height, 0, cast(u32)format, gl.UNSIGNED_BYTE, data);
+
+  gl.GenerateMipmap(gl.TEXTURE_2D);
+
+  return texture_id;
+}