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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
// This file contains utilities shared between tests for the WEBGL_draw_buffers extension and multiple draw buffers functionality in WebGL 2.0.
'use strict';
var WebGLDrawBuffersUtils = function(gl, ext) {
var getMaxUsableColorAttachments = function() {
var maxDrawingBuffers;
var maxColorAttachments;
if (ext) {
// EXT_draw_buffers
maxDrawingBuffers = gl.getParameter(ext.MAX_DRAW_BUFFERS_WEBGL);
maxColorAttachments = gl.getParameter(ext.MAX_COLOR_ATTACHMENTS_WEBGL);
} else {
// WebGL 2.0
maxDrawingBuffers = gl.getParameter(gl.MAX_DRAW_BUFFERS);
maxColorAttachments = gl.getParameter(gl.MAX_COLOR_ATTACHMENTS);
}
var maxUniformVectors = gl.getParameter(gl.MAX_FRAGMENT_UNIFORM_VECTORS);
return Math.min(maxDrawingBuffers, maxColorAttachments, maxUniformVectors);
};
var makeColorAttachmentArray = function(size) {
var array = []
for (var ii = 0; ii < size; ++ii) {
array.push(gl.COLOR_ATTACHMENT0 + ii);
}
return array;
}
var checkProgram = wtu.setupTexturedQuad(gl);
var checkAttachmentsForColorFn = function(attachments, colorFn) {
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.useProgram(checkProgram);
attachments.forEach(function(attachment, index) {
gl.bindTexture(gl.TEXTURE_2D, attachment.texture);
wtu.clearAndDrawUnitQuad(gl);
var expectedColor = colorFn(attachment, index);
var tolerance = 0;
expectedColor.forEach(function(v) {
if (v != 0 && v != 255) {
tolerance = 8;
}
});
wtu.checkCanvas(gl, expectedColor, "attachment " + index + " should be " + expectedColor.toString(), tolerance);
});
debug("");
};
var checkAttachmentsForColor = function(attachments, color) {
checkAttachmentsForColorFn(attachments, function(attachment, index) {
return color || attachment.color;
});
};
return {
getMaxUsableColorAttachments: getMaxUsableColorAttachments,
makeColorAttachmentArray: makeColorAttachmentArray,
checkAttachmentsForColorFn: checkAttachmentsForColorFn,
checkAttachmentsForColor: checkAttachmentsForColor
};
};