| <html> |
| <head> |
| <script src="../../../resources/js-test.js"></script> |
| <script src="resources/webgl-test.js"></script> |
| <script id="vshader" type="x-shader/x-vertex"> |
| attribute vec3 pos; |
| attribute vec4 colorIn; |
| uniform float pointSize; |
| varying vec4 color; |
| |
| void main() |
| { |
| gl_PointSize = pointSize; |
| color = colorIn; |
| gl_Position = vec4(pos.xyz, 3.0); |
| } |
| </script> |
| |
| <script id="fshader" type="x-shader/x-fragment"> |
| #ifdef GL_ES |
| precision mediump float; |
| #endif |
| varying vec4 color; |
| |
| void main() |
| { |
| gl_FragColor = color; |
| } |
| </script> |
| |
| <script> |
| function runTest() |
| { |
| var gl = initWebGL('testbed', 'vshader', 'fshader', ['pos', 'colorIn'], [0, 0, 0, 1], 1, { antialias: false }); |
| if (!gl) { |
| testFailed('initWebGL(..) failed'); |
| return false; |
| } |
| gl.disable(gl.BLEND); |
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| |
| // The choice of (0.4, 0.4) ensures that the centers of the surrounding |
| // pixels are not contained within the point when it is of size 1, but |
| // that they definitely are when it is of size 2. |
| var vertices = new Float32Array([ |
| 0.4, 0.4, 0.0]); |
| var colors = new Uint8Array([ |
| 255, 0, 0, 255]); |
| |
| var colorOffset = vertices.byteLength; |
| |
| var vbo = gl.createBuffer(); |
| gl.bindBuffer(gl.ARRAY_BUFFER, vbo); |
| gl.bufferData(gl.ARRAY_BUFFER, colorOffset + colors.byteLength, gl.STATIC_DRAW); |
| gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertices); |
| gl.bufferSubData(gl.ARRAY_BUFFER, colorOffset, colors); |
| |
| gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0); |
| gl.enableVertexAttribArray(0); |
| gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, colorOffset); |
| gl.enableVertexAttribArray(1); |
| |
| var locPointSize = gl.getUniformLocation(gl.program, 'pointSize'); |
| |
| debug('Draw a point of size 1 and verify it does not touch any other pixels.'); |
| |
| gl.uniform1f(locPointSize, 1.0); |
| gl.drawArrays(gl.POINTS, 0, vertices.length / 3); |
| var buf = new Uint8Array(2 * 2 * 4); |
| gl.readPixels(0, 0, 2, 2, gl.RGBA, gl.UNSIGNED_BYTE, buf); |
| var index = 0; |
| for (var y = 0; y < 2; ++y) { |
| for (var x = 0; x < 2; ++x) { |
| var correctColor = [0, 0, 0]; |
| if (x == 1 && y == 1) |
| correctColor[0] = 255; |
| if (buf[index] != correctColor[0] || buf[index + 1] != correctColor[1] || buf[index + 2] != correctColor[2]) { |
| testFailed('Drawing a point of size 1 touched pixels that should not be touched'); |
| return false; |
| } |
| index += 4; |
| } |
| } |
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| |
| debug('Draw a point of size 2 and verify it fills the appropriate region.'); |
| |
| var pointSizeRange = gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE); |
| if (pointSizeRange < 2.0) |
| return true; |
| |
| gl.uniform1f(locPointSize, 2.0); |
| gl.drawArrays(gl.POINTS, 0, vertices.length / 3); |
| gl.readPixels(0, 0, 2, 2, gl.RGBA, gl.UNSIGNED_BYTE, buf); |
| index = 0; |
| for (var y = 0; y < 2; ++y) { |
| for (var x = 0; x < 2; ++x) { |
| var correctColor = [255, 0, 0]; |
| if (buf[index] != correctColor[0] || buf[index + 1] != correctColor[1] || buf[index + 2] != correctColor[2]) { |
| testFailed('Drawing a point of size 2 failed to fill the appropriate region'); |
| return false; |
| } |
| index += 4; |
| } |
| } |
| |
| return true; |
| } |
| </script> |
| </head> |
| <body> |
| <canvas id="testbed" width="2px" height="2px"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| description('Verify GL_VERTEX_PROGRAM_POINT_SIZE is enabled in WebGL'); |
| |
| if (runTest()) |
| testPassed(""); |
| </script> |
| </body> |
| </html> |
