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Reorganized the nogame screen’s drawing code to marginally reduce CPU usage. Woo!

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Alex Szpakowski
2013-11-13 04:07:29 -04:00
parent 51c01ca407
commit 0fb05fd84d
2 changed files with 58 additions and 33 deletions
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src/scripts/boot.lua
+26 -12
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@@ -1313,6 +1313,8 @@ function love.nogame()
local text = {}
local rain = {}
local g_time = 0
local create_rain
function love.load()
-- Subtractive blending isn't supported on some ancient systems, so
@@ -1357,19 +1359,18 @@ function love.nogame()
rain.ox = -rain.img_w / 2
rain.oy = -rain.img_h / 2
rain.batch = love.graphics.newSpriteBatch(rain.image, 512)
rain.t = 0
create_rain()
end
local function update_rain(t)
function create_rain()
local batch = rain.batch
local ix = 0
local iy = 0
local sx = rain.spacing_x
local sy = rain.spacing_y
local ox = rain.ox
local oy = rain.oy
local img_w = rain.img_w
local img_h = rain.img_h
local batch_w = 2 * math.ceil(love.graphics.getWidth() / sx) + 2
local batch_h = 2 * math.ceil(love.graphics.getHeight() / sy) + 2
@@ -1385,9 +1386,9 @@ function love.nogame()
for i = 0, batch_h - 1 do
for j = 0, batch_w - 1 do
local is_even = (j % 2) == 0
local offset_y = is_even and sy * t or sy / 2 + sy * t
local x = ix + ox + j * sx
local y = iy + oy + i * sy + offset_y
local offset_y = is_even and 0 or sy / 2
local x = ox + j * sx
local y = oy + i * sy + offset_y
batch:add(x, y)
end
end
@@ -1395,6 +1396,14 @@ function love.nogame()
batch:unbind()
end
local function update_rain(t)
rain.t = t
end
function love.resize(w, h)
create_rain()
end
function love.update(dt)
g_time = g_time + dt / 2
local int, frac = math.modf(g_time)
@@ -1410,13 +1419,18 @@ function love.nogame()
blendmode = "additive"
end
local y = rain.spacing_y * rain.t
local small_y = -rain.spacing_y + y / 2
local big_y = -rain.spacing_y + y
love.graphics.setBlendMode(blendmode)
love.graphics.setColor(255, 255, 255, 128)
love.graphics.draw(rain.batch, -rain.spacing_x, -rain.spacing_y, 0, 0.5, 0.5)
love.graphics.draw(rain.batch, -rain.spacing_x, small_y, 0, 0.5, 0.5)
love.graphics.setBlendMode("alpha")
love.graphics.setColor(255, 255, 255, 255)
love.graphics.draw(rain.batch, -rain.spacing_x, -rain.spacing_y)
love.graphics.draw(rain.batch, -rain.spacing_x, big_y)
end
local function draw_text(x, y)