I'm posting my widget + shader below. Hopefully you'll be able to analyze it yourself and apply it to your problem.
It's important to note that it doesn't do sun lighting or SSMF. It's unfortunate, but someone will have to create the custom
map shader framework (or extend the existing CUSF), and I don't have the time to do so this month. That said, you can still get the effects I achieved in the video, and try hacking in things one at a time as you need them.
Please ask if you have any further questions about the code below.
Code: Select all
function widget:GetInfo()
return {
name = "MapShader",
desc = "MapShader demo",
author = "gajop",
date = "",
license = "",
layer = 0,
enabled = true,
}
end
local shader, timeID, pointsID, pointsSizeID
local MAX_POINTS = 10
local points = {}
function widget:Initialize()
local vertexShader = [[
#define SMF_TEXSQR_SIZE 1024.0
uniform ivec2 texSquare;
varying vec2 texCoors;
varying vec4 colorChange;
uniform float time;
uniform float points[MAX_POINTS];
uniform int pointSize;
void main(void) {
texCoors = (floor(gl_Vertex.xz) / SMF_TEXSQR_SIZE) - vec2(texSquare);
vec4 pos = gl_Vertex;
colorChange = vec4(0, 0, 0, 1);
for (int i = 0; i < pointSize; i++) {
float d = distance(vec2(points[i*3], points[i*3+1]), pos.xz);
float dtime = time - points[i*3+2];
float timeFalloff = pow(dtime, 3) + 1;
float rangeFalloff = pow(d/400, 2) + 1;
float rangeFrequency = sin(d/1000 + 1);
pos.y += sin(dtime*10) * 200 / rangeFalloff * rangeFrequency / timeFalloff;
colorChange += vec4(sin(dtime*10) * 200 / rangeFalloff * rangeFrequency / timeFalloff) / 1000;
}
gl_Position = gl_ModelViewProjectionMatrix * pos;
}
]]
vertexShader = vertexShader:gsub("MAX_POINTS", tostring(MAX_POINTS*3))
shader = gl.CreateShader({
vertex = vertexShader,
fragment = [[
uniform sampler2D texSampler;
varying vec2 texCoors;
varying vec4 colorChange;
void main(void) {
gl_FragColor = texture2D(texSampler, texCoors);
gl_FragColor += colorChange;
}
]],
uniformInt = {
texSampler = 0,
pointSize = 0,
},
uniformFloat = {
time = 0,
},
})
local errors = gl.GetShaderLog(shader)
if errors ~= "" then
Spring.Log("MapShaders", LOG.ERROR, errors)
end
Spring.SetMapShader(shader, 0)
end
function widget:Shutdown()
Spring.SetMapShader(0, 0)
end
function widget:DrawWorld()
gl.UseShader(shader)
if not timeID then
timeID = gl.GetUniformLocation(shader, "time")
pointsID = gl.GetUniformLocation(shader, "points")
pointSizeID = gl.GetUniformLocation(shader, "pointSize")
end
gl.Uniform( timeID, os.clock())
gl.UniformInt( pointSizeID, #points/3)
gl.UniformArray(pointsID, 1, points)
gl.UseShader(0)
end
function widget:MousePress(x, y, button)
local time = os.clock()
if button == 1 or button == 3 then
local result, coords = Spring.TraceScreenRay(x, y, true)
if result == "ground" then
if #points >= MAX_POINTS * 3 then
table.remove(points, 1)
table.remove(points, 1)
table.remove(points, 1)
end
table.insert(points, coords[1])
table.insert(points, coords[3])
table.insert(points, time)
end
end
end
