150 lines
5.8 KiB
HTML
150 lines
5.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>texImage2D ImageData Test</title>
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<script src="resources/webgl-test.js"> </script>
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<script id="vshader" type="x-shader/x-vertex">
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attribute vec3 vPosition;
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attribute vec2 vTexCoord0;
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varying vec2 texCoord;
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void main()
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{
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gl_Position = vec4(vPosition.x, vPosition.y, vPosition.z, 1.0);
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texCoord = vTexCoord0;
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}
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</script>
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<script id="fshader" type="x-shader/x-fragment">
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#ifdef GL_ES
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precision highp float;
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#endif
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uniform sampler2D tex;
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varying vec2 texCoord;
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void main()
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{
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gl_FragColor = texture2D(tex, texCoord);
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}
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</script>
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<script>
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function fail(x,y, buf, shouldBe)
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{
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var i = (y*64+x) * 4;
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var reason = "pixel at ("+x+","+y+") is ("+buf[i]+","+buf[i+1]+","+buf[i+2]+","+buf[i+3]+"), should be "+shouldBe;
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document.getElementById("results").innerHTML = "Test <span style='color:red'>FAILED</span> "+reason;
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}
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function pass()
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{
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document.getElementById("results").innerHTML = "Test <span style='color:green'>PASSED</span>";
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}
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function checkGLError()
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{
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var error = gl.getError();
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if (error != gl.NO_ERROR) {
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var str = "GL Error: " + error;
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document.body.appendChild(document.createTextNode(str));
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throw str;
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}
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}
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function init()
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{
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if (window.testRunner)
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testRunner.dumpAsText();
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// Set up a canvas to get image data from
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var canvas2d = document.getElementById("texcanvas");
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var context2d = canvas2d.getContext("2d");
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context2d.fillStyle = 'red';
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context2d.fillRect(0,0,64,64);
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gl = initWebGL("example", "vshader", "fshader", [ "vPosition", "vTexCoord0"], [ 1, 0, 1, 1 ], 100);
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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var vertexObject = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
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var vertices = new Float32Array([
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-1, 1, 0,
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-1, -1, 0,
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1, 1, 0,
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1, -1, 0,
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1, 1, 0,
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-1, -1, 0]);
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var texCoords = new Float32Array([
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0, 1,
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0, 0,
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1, 1,
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1, 0,
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1, 1,
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0, 0]);
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g_texCoordOffset = vertices.byteLength;
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gl.bufferData(gl.ARRAY_BUFFER, g_texCoordOffset + texCoords.byteLength, gl.STATIC_DRAW);
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gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertices);
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gl.bufferSubData(gl.ARRAY_BUFFER, g_texCoordOffset, texCoords);
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gl.enableVertexAttribArray(0);
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gl.vertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, 0);
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gl.enableVertexAttribArray(1);
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gl.vertexAttribPointer(1, 2, gl.FLOAT, gl.FALSE, 0, g_texCoordOffset);
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// Create a texture from the canvas's image data
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var tex = gl.createTexture();
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gl.bindTexture(gl.TEXTURE_2D, tex);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, context2d.getImageData(0, 0, 64, 64));
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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g_textureLoc = gl.getUniformLocation(gl.program, "tex");
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gl.uniform1i(g_textureLoc, 0);
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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gl.drawArrays(gl.TRIANGLES, 0, 6);
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checkGLError();
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// Test several locations
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// Each line should be all red
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var buf = new Uint8Array(64 * 64 * 4);
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gl.readPixels(0, 0, 64, 64, gl.RGBA, gl.UNSIGNED_BYTE, buf);
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var offset15 = 3840; // (15*64) * 4
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var offset40 = 10240; // (40*64) * 4
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var offset63 = 16128; // (63*64) * 4
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for (var i = 0; i < 64; ++i) {
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var test0 = (buf[i*4] != 255 || buf[i*4+1] != 0 || buf[i*4+2] != 0 || buf[i*4+3] != 255);
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var test15 = (buf[offset15+i*4] != 255 || buf[offset15+i*4+1] != 0 || buf[offset15+i*4+2] != 0 || buf[offset15+i*4+3] != 255);
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var test40 = (buf[offset40+i*4] != 255 || buf[offset40+i*4+1] != 0 || buf[offset40+i*4+2] != 0 || buf[offset40+i*4+3] != 255);
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var test63 = (buf[offset63+i*4] != 255 || buf[offset63+i*4+1] != 0 || buf[offset63+i*4+2] != 0 || buf[offset63+i*4+3] != 255);
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if (test0) {
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fail(i, 0, buf, "(255,0,0,255)");
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return;
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}
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if (test15) {
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fail(i, 15, buf, "(255,0,0,255)");
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return;
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}
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if (test40) {
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fail(i, 40, buf, "(255,0,0,255)");
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return;
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}
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if (test63) {
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fail(i, 63, buf, "(255,0,0,255)");
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return;
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}
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}
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pass();
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}
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</script>
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</head>
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<body onload="init()">
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<canvas id="texcanvas" width="64px" height="64px"></canvas>
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<canvas id="example" width="64px" height="64px">
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There is supposed to be an example drawing here, but it's not important.
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</canvas>
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<div id="results">Test <span style="color:red">FAILED</span></div>
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</body>
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</html>
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