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Fallback to mediump precision for device that doesn't support highp #109

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Fallback to mediump precision for device that doesn't support highp #109

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21 changes: 13 additions & 8 deletions Player/WebGLCanvas.js
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,7 @@ H264bsdCanvas.prototype.isWebGL = function() {

if(!gl || typeof gl.getParameter !== "function") {
gl = null;
}
}

++nameIndex;
};
Expand Down Expand Up @@ -128,7 +128,7 @@ H264bsdCanvas.prototype.initProgram = function() {
'1.1643828125, 2.017234375, 0, -1.081390625,',
'0, 0, 0, 1',
');',

'void main(void) {',
'highp float y = texture2D(ySampler, textureCoord).r;',
'highp float u = texture2D(uSampler, textureCoord).r;',
Expand All @@ -137,6 +137,11 @@ H264bsdCanvas.prototype.initProgram = function() {
'}'
].join('\n');

var precisionFormat = gl.getShaderPrecisionFormat(gl.FRAGMENT_SHADER, gl.HIGH_FLOAT);
if(precisionFormat.precision <= 0) {
fragmentShaderScript = fragmentShaderScript.replace(/highp/g, 'mediump');
}

var vertexShader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vertexShader, vertexShaderScript);
gl.compileShader(vertexShader);
Expand All @@ -160,7 +165,7 @@ H264bsdCanvas.prototype.initProgram = function() {
}

gl.useProgram(program);

this.shaderProgram = program;
};

Expand Down Expand Up @@ -253,7 +258,7 @@ H264bsdCanvas.prototype.drawNextOuptutPictureGL = function(width, height, croppi
var texturePosBuffer = this.texturePosBuffer;
var yTextureRef = this.yTextureRef;
var uTextureRef = this.uTextureRef;
var vTextureRef = this.vTextureRef;
var vTextureRef = this.vTextureRef;

if(croppingParams === null) {
gl.viewport(0, 0, width, height);
Expand Down Expand Up @@ -290,7 +295,7 @@ H264bsdCanvas.prototype.drawNextOuptutPictureGL = function(width, height, croppi
gl.bindTexture(gl.TEXTURE_2D, vTextureRef);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.LUMINANCE, width/2, height/2, 0, gl.LUMINANCE, gl.UNSIGNED_BYTE, crData);

gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
};

/**
Expand All @@ -313,7 +318,7 @@ H264bsdCanvas.prototype.drawNextOuptutPictureRGBA = function(width, height, crop
ctx.putImageData(imageData, -croppingParams.left, -croppingParams.top, 0, 0, croppingParams.width, croppingParams.height);
}
};

return H264bsdCanvas;
}));

}));