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Modify Tile Shader to produce scaled layers that look identical to the Canvas renderer scaling (add uCentreOffset, scale the drawing coordinates, subtract uCentreOffset).

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This commit is contained in:
Pete Baron 2016-07-18 12:43:59 +12:00
parent 0b392e19a2
commit fdb80f1a55
1 changed files with 6 additions and 4 deletions
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10
src/pixi/renderers/webgl/shaders/TilemapShader.js
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@ -41,12 +41,13 @@ PIXI.TilemapShader = function(gl)
this.vertexSrc = [
" precision lowp float;",
" uniform vec2 uScrollOffset;",
" uniform vec2 uCentreOffset;",
" uniform vec2 uScale;",
" attribute vec4 aPosition;",
" varying vec2 vTexCoord;",
" void main(void) {",
" gl_Position.zw = vec2(1, 1);",
" gl_Position.xy = aPosition.xy - uScrollOffset;",
" gl_Position.xy = (aPosition.xy + uCentreOffset) * uScale - uCentreOffset;",
" vTexCoord = aPosition.zw;",
" }"
];
@ -79,11 +80,12 @@ PIXI.TilemapShader.prototype.init = function()
// get and store the attributes
this.aPosition = gl.getAttribLocation(program, 'aPosition');
this.uSampler = gl.getUniformLocation(program, 'uImageSampler');
this.uScrollOffset = gl.getUniformLocation(program, 'uScrollOffset');
this.uCentreOffset = gl.getUniformLocation(program, 'uCentreOffset');
this.uAlpha = gl.getUniformLocation(program, 'uAlpha');
this.uScale = gl.getUniformLocation(program, 'uScale');
this.attributes = [this.aPosition, this.uSampler];
this.uniforms = [this.uScrollOffset, this.uAlpha];
this.uniforms = [this.uCentreOffset, this.uAlpha, this.uScale];
this.program = program;
};