third_party/WebKit/LayoutTests/fast/canvas/webgl/tex-sub-image-2d.html

   1 <html>
   2 <head>
   3 <script src="../../../resources/js-test.js"></script>
   4 <script src="resources/webgl-test.js"></script>
   5 <script src="resources/webgl-test-utils.js"></script>
   6 <script id="fshader" type="x-shader/x-fragment">
   7 #ifdef GL_ES
   8 precision highp float;
   9 #endif
  10 uniform sampler2D tex;
  11 varying vec2 texCoord;
  12
  13 void main()
  14 {
  15     float intensity = texture2D(tex, texCoord).a;
  16     gl_FragColor = vec4(intensity, intensity, intensity, 1.0);
  17 }
  18 </script>
  19
  20 </head>
  21 <body>
  22 <canvas id="example" width="256px" height="1px"></canvas>
  23 <div id="description"></div>
  24 <div id="console"></div>
  25 <script>
  26 description('Tests texSubImage2D upload path from Uint8Array');
  27
  28 var wtu = WebGLTestUtils;
  29 var canvas = document.getElementById("example");
  30 var gl = wtu.create3DContext(canvas);
  31 var program = wtu.setupProgram(
  32     gl,
  33     [wtu.setupSimpleTextureVertexShader(gl),
  34      wtu.loadShaderFromScript(gl, "fshader")],
  35     ['vPosition', 'texCoord0']);
  36 wtu.setupUnitQuad(gl);
  37 var textureWidth = 256;
  38 var textureHeight = 1;
  39
  40 textureLoc = gl.getUniformLocation(program, "tex");
  41
  42 var texture = gl.createTexture();
  43 gl.bindTexture(gl.TEXTURE_2D, texture);
  44 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
  45 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
  46 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
  47 gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
  48 // Allocate the texture object
  49 gl.texImage2D(gl.TEXTURE_2D, 0, gl.ALPHA, textureWidth, textureHeight, 0, gl.ALPHA, gl.UNSIGNED_BYTE, null);
  50 // Prepare the image data
  51 var array = new Uint8Array(textureWidth);
  52 for (var i = 0; i < textureWidth; i++)
  53     array[i] = i;
  54 // Fill the texture object with data -- this is actually the code path being tested
  55 gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, textureWidth, textureHeight, gl.ALPHA, gl.UNSIGNED_BYTE, array);
  56
  57 // Clear and set up
  58 gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  59 gl.bindTexture(gl.TEXTURE_2D, texture);
  60 gl.useProgram(program);
  61 gl.uniform1i(textureLoc, 0);
  62 // Draw the texture to the frame buffer
  63 gl.drawArrays(gl.TRIANGLES, 0, 6);
  64
  65 // Read back the frame buffer
  66 var buf = new Uint8Array(textureWidth * textureHeight * 4);
  67 gl.readPixels(0, 0, textureWidth, textureHeight, gl.RGBA, gl.UNSIGNED_BYTE, buf);
  68
  69 // Verify the frame buffer's contents
  70 var passed = true;
  71 for (var i = 0; i < textureWidth; i++) {
  72     var val = i;
  73     if (buf[4 * i + 0] != val ||
  74         buf[4 * i + 1] != val ||
  75         buf[4 * i + 2] != val) {
  76         testFailed("pixel at (" + i + ", 0) was (" +
  77                    buf[4 * i + 0] + ", " +
  78                    buf[4 * i + 1] + ", " +
  79                    buf[4 * i + 2] + "), should be (" +
  80                    val + ", " + val + ", " + val + ")");
  81         passed = false;
  82         break;
  83     }
  84 }
  85
  86 if (passed)
  87     testPassed("");
  88 </script>
  89 </body>
  90 </html>