From 2cd21d3608b949780c7e12eea6077f9facaff188 Mon Sep 17 00:00:00 2001
From: Jon Michael Aanes <jonjmaa@gmail.com>
Date: Sun, 22 Oct 2023 13:08:52 +0200
Subject: [PATCH] set_shader_texture_size

---
 spritesheet.lua | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/spritesheet.lua b/spritesheet.lua
index 3fc7ad6..2d35e1a 100644
--- a/spritesheet.lua
+++ b/spritesheet.lua
@@ -72,11 +72,21 @@ function Sprite.new (quad, imagesheet)
     return setmetatable({ quad = quad, imagesheet = imagesheet, is_sprite = true }, Sprite)
 end
 
+local function set_shader_texture_size(texture)
+    local currently_active_shader = love.graphics.getShader()
+    if currently_active_shader ~= nil and currently_active_shader:hasUniform('spritesheet_inverse_width') then
+        local width, height = texture:getDimensions()
+        currently_active_shader:send('spritesheet_inverse_width', {1/width,        0})
+        currently_active_shader:send('spritesheet_inverse_height', {      0, 1/height})
+    end
+end
+
 if define_love then
 
 function Sprite:generateImage ()
     local imagesheet, quad  =  self.imagesheet, self.quad
     self.func = function (x, y)
+        set_shader_texture_size(imagesheet.image)
         love.graphics.draw(imagesheet.image, quad, math.floor(x), math.floor(y), 0, 1, 1, imagesheet.origin_x, imagesheet.origin_y)
     end
 end
@@ -138,6 +148,7 @@ function Animation:generateImage ()
         if self.wrap then  t = t % self.duration  end
         local quad = get_quad_based_on_time(self, t)
         if not quad then  error_internal('Could not determine quad when drawing animation. Time was %f.', t)  end
+        set_shader_texture_size(self.imagesheet.image)
         love.graphics.draw(self.imagesheet.image, quad, x, y, 0, 1, 1, self.imagesheet.origin_x, self.imagesheet.origin_y)
     end
 end