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--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
-- file: gui_xray_shader.lua
-- brief: xray shader
-- author: Dave Rodgers
--
-- Copyright (C) 2007.
-- Licensed under the terms of the GNU GPL, v2 or later.
--
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
function widget:GetInfo()
return {
name = "XrayShader",
desc = "XrayShader",
author = "trepan",
date = "Jul 15, 2007",
license = "GNU GPL, v2 or later",
layer = 0,
enabled = true -- loaded by default?
}
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-- Automatically generated local definitions
local GL_ONE = GL.ONE
local GL_ONE_MINUS_SRC_ALPHA = GL.ONE_MINUS_SRC_ALPHA
local GL_SRC_ALPHA = GL.SRC_ALPHA
local glBlending = gl.Blending
local glColor = gl.Color
local glCreateShader = gl.CreateShader
local glDeleteShader = gl.DeleteShader
local glDepthTest = gl.DepthTest
local glFeature = gl.Feature
local glGetShaderLog = gl.GetShaderLog
local glPolygonOffset = gl.PolygonOffset
local glSmoothing = gl.Smoothing
local glUnit = gl.Unit
local glUseShader = gl.UseShader
local spEcho = Spring.Echo
local spGetAllFeatures = Spring.GetAllFeatures
local spGetTeamColor = Spring.GetTeamColor
local spGetTeamList = Spring.GetTeamList
local spGetTeamUnits = Spring.GetTeamUnits
local spIsUnitVisible = Spring.IsUnitVisible
local spIsUnitIconic = Spring.IsUnitIconic
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
if (not glCreateShader) then
spEcho("Hardware is incompatible with Xray shader requirements")
return false
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
-- simple configuration parameters
--
local edgeExponent = 2.5
local doFeatures = false
local featureColor = { 1, 0, 1 }
-- looks a lot nicer, esp. without FSAA (but eats into the FPS too much)
local smoothPolys = glSmoothing and true
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
local shader
function widget:Shutdown()
glDeleteShader(shader)
end
function widget:Initialize()
shader = glCreateShader({
uniform = {
edgeExponent = edgeExponent,
},
vertex = [[
// Application to vertex shader
varying vec3 normal;
varying vec3 eyeVec;
varying vec3 color;
uniform mat4 camera;
uniform mat4 caminv;
void main()
{
vec4 P = gl_ModelViewMatrix * gl_Vertex;
eyeVec = P.xyz;
normal = gl_NormalMatrix * gl_Normal;
color = gl_Color.rgb;
gl_Position = gl_ProjectionMatrix * P;
}
]],
fragment = [[
varying vec3 normal;
varying vec3 eyeVec;
varying vec3 color;
uniform float edgeExponent;
void main()
{
float opac = dot(normalize(normal), normalize(eyeVec));
opac = 1.0 - abs(opac);
opac = pow(opac, edgeExponent);
gl_FragColor.rgb = color;
gl_FragColor.a = opac;
}
]],
})
if (shader == nil) then
spEcho(glGetShaderLog())
spEcho("Xray shader compilation failed.")
widgetHandler:RemoveWidget()
end
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
--
-- utility routine
--
local teamColors = {}
local function SetTeamColor(teamID)
local color = teamColors[teamID]
if (color) then
glColor(color)
return
end
local r,g,b = spGetTeamColor(teamID)
if (r and g and b) then
color = { r, g, b }
teamColors[teamID] = color
glColor(color)
return
end
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
function widget:DrawWorld()
if (smoothPolys) then
glSmoothing(nil, nil, true)
end
glColor(1, 1, 1, 1)
glUseShader(shader)
glDepthTest(true)
glBlending(GL_SRC_ALPHA, GL_ONE)
glPolygonOffset(-2, -2)
for _, teamID in ipairs(spGetTeamList()) do
SetTeamColor(teamID)
for _, unitID in ipairs(spGetTeamUnits(teamID)) do
if (spIsUnitVisible(unitID, nil, true)) then
glUnit(unitID, true)
end
end
end
if (doFeatures) then
glColor(featureColor)
for _, featureID in ipairs(spGetAllFeatures()) do
glFeature(featureID, true)
end
end
glPolygonOffset(false)
glBlending(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
glDepthTest(false)
glUseShader(0)
glColor(1, 1, 1, 1)
if (smoothPolys) then
glSmoothing(nil, nil, false)
end
end
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
|
