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local MAX_BUNNIES = 100000
-- This is the maximum amount of elements (quads) per batch
-- NOTE: This value is defined in [rlgl] module and can be changed there
local MAX_BATCH_ELEMENTS = 8192
-- Create the Bunny class.
local Bunny = {}
Bunny.__index = Bunny
function Bunny:new( pos, spd, col )
local bunny = {}
setmetatable( bunny, Bunny )
bunny.position = pos
bunny.speed = spd
bunny.color = col
return bunny
end
-- Initialization
local screenWidth = 800
local screenHeight = 450
local texSize = { 0, 0 }
local texBunny = -1
local bunnies = {}
function Bunny:update()
self.position[1] = self.position[1] + self.speed[1]
self.position[2] = self.position[2] + self.speed[2]
if ( ( self.position[1] + texSize[1] / 2 ) > screenWidth )
or ( ( self.position[2] + texSize[1] / 2 ) < 0 ) then
self.speed[1] = self.speed[1] * -1
end
if ( ( self.position[2] + texSize[2] / 2 ) > screenHeight )
or ( ( self.position[2] + texSize[2] / 2 - 40 ) < 0 ) then
self.speed[2] = self.speed[2] * -1
end
end
-- Init
function init()
RL_SetWindowState( FLAG_VSYNC_HINT )
RL_SetWindowSize( { screenWidth, screenHeight } )
RL_SetWindowTitle( "raylib [textures] example - bunnymark" )
-- Load bunny texture
texBunny = RL_LoadTexture( RL_GetBasePath().."../resources/images/wabbit_alpha.png" )
texSize = RL_GetTextureSize( texBunny )
end
-- Update
function process( delta )
if RL_IsMouseButtonDown( 0 ) then
-- Create more bunnies
for i = 1, 100 do
if #bunnies < MAX_BUNNIES then
local speed = { math.random( -250, 250 ) / 60, math.random( -250, 250 ) / 60 }
local color = { math.random( 50, 240 ), math.random( 80, 240 ), math.random( 100, 240 ), 255 }
table.insert( bunnies, Bunny:new( RL_GetMousePosition(), speed, color) )
end
end
end
-- Update bunnies
for i = 1, #bunnies do
bunnies[i]:update()
end
end
-- Draw
function draw()
RL_ClearBackground( RAYWHITE )
for i = 1, #bunnies do
-- NOTE: When internal batch buffer limit is reached (MAX_BATCH_ELEMENTS),
-- a draw call is launched and buffer starts being filled again;
-- before issuing a draw call, updated vertex data from internal CPU buffer is send to GPU...
-- Process of sending data is costly and it could happen that GPU data has not been completely
-- processed for drawing while new data is tried to be sent (updating current in-use buffers)
-- it could generates a stall and consequently a frame drop, limiting the number of drawn bunnies
RL_DrawTexture( texBunny, { bunnies[i].position[1], bunnies[i].position[2] }, bunnies[i].color );
end
RL_DrawRectangle( { 0, 0, screenWidth, 40 }, BLACK)
RL_DrawText( 0, "bunnies: " .. #bunnies, { 120, 10 }, 20, 2, GREEN )
RL_DrawText( 0, "batched draw calls: " .. math.ceil( 1 + #bunnies / MAX_BATCH_ELEMENTS ), { 320, 10 }, 20, 2, RED )
RL_DrawFPS( { 10, 10 } )
end
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