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Pixel-like coin glint shader for Solar2d
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| -- pixel-like coin glint | |
| -- USAGE: | |
| -- require ("glint') | |
| --local object = display.newImage("image.png") | |
| --object.fill.effect = "filter.custom.glint" | |
| --object.fill.effect.intensity = 1.0 -- how bright the glint is | |
| --object.fill.effect.size = 0.1 -- how wide the glint is as a percent of the object | |
| --object.fill.effect.tilt = 0.2 -- tilt the direction of the glint | |
| --object.fill.effect.speed = 1.0 -- how fast the glint moves across the object | |
| local kernel = {} | |
| kernel.language = "glsl" | |
| kernel.category = "filter" | |
| -- By default, the group is "custom" | |
| --kernel.group = "custom" | |
| kernel.name = "glint" | |
| kernel.isTimeDependent = true | |
| -- Expose effect parameters using vertex data | |
| kernel.vertexData = { | |
| { | |
| name = "intensity", | |
| default = 0.65, | |
| min = 0, | |
| max = 1, | |
| index = 0, -- This corresponds to "CoronaVertexUserData.x" | |
| }, | |
| { | |
| name = "size", | |
| default = 0.1, | |
| min = 0, | |
| max = 1, | |
| index = 1, -- This corresponds to "CoronaVertexUserData.y" | |
| }, | |
| { | |
| name = "tilt", | |
| default = 0.2, | |
| min = 0.0, | |
| max = 2.0, | |
| index = 2, -- This corresponds to "CoronaVertexUserData.z" | |
| }, | |
| { | |
| name = "speed", | |
| default = 1.0, | |
| min = 0.1, | |
| max = 10.0, | |
| index = 3, -- This corresponds to "CoronaVertexUserData.w" | |
| }, | |
| } | |
| kernel.fragment = | |
| [[ | |
| P_COLOR vec4 FragmentKernel( P_UV vec2 texCoord ) | |
| { | |
| P_COLOR float intensity = CoronaVertexUserData.x; | |
| P_COLOR vec4 texColor = texture2D( CoronaSampler0, texCoord ); | |
| // Grab a float from the total time * speed | |
| P_COLOR float glint = floor(20.0 * mod(CoronaVertexUserData.w * CoronaTotalTime, 2.0)) * 0.05; | |
| glint = glint + (CoronaVertexUserData.z * sin(texCoord.y - 0.5)); | |
| // Calculate where the glint is at | |
| P_COLOR float size = CoronaVertexUserData.y * 0.5; | |
| intensity = (step(texCoord.x, glint + size) - step(texCoord.x, glint - size)) * intensity * texColor.a; | |
| // Add the intensity | |
| texColor.rgb += intensity; | |
| // Modulate by the display object's combined alpha/tint. | |
| return CoronaColorScale( texColor ); | |
| } | |
| ]] | |
| graphics.defineEffect( kernel ) |
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