diff --git a/lib/make/webgl.js b/lib/make/webgl.js
index db6f384..aef2a66 100644
--- a/lib/make/webgl.js
+++ b/lib/make/webgl.js
@@ -551,5 +551,192 @@ make.webgl = {
       ])
     }
     return random.item(usage)
+  },
+  randomParameter: (isWebGL2) => {
+    let pname = [
+      'ACTIVE_TEXTURE',
+      'ALIASED_LINE_WIDTH_RANGE',
+      'ALIASED_POINT_SIZE_RANGE',
+      'ALPHA_BITS',
+      'ARRAY_BUFFER_BINDING',
+      'BLEND',
+      'BLEND_COLOR',
+      'BLEND_DST_ALPHA',
+      'BLEND_DST_RGB',
+      'BLEND_EQUATION_ALPHA',
+      'BLEND_EQUATION_RGB',
+      'BLEND_SRC_ALPHA',
+      'BLEND_SRC_RGB',
+      'BLUE_BITS',
+      'COLOR_CLEAR_VALUE',
+      'COLOR_WRITEMASK',
+      'COMPRESSED_TEXTURE_FORMATS',
+      'CULL_FACE',
+      'CULL_FACE_MODE',
+      'CURRENT_PROGRAM',
+      'DEPTH_BITS',
+      'DEPTH_CLEAR_VALUE',
+      'DEPTH_FUNC',
+      'DEPTH_RANGE',
+      'DEPTH_TEST',
+      'DEPTH_WRITEMASK',
+      'DITHER',
+      'ELEMENT_ARRAY_BUFFER_BINDING',
+      'FRAMEBUFFER_BINDING',
+      'FRONT_FACE',
+      'GENERATE_MIPMAP_HINT',
+      'GREEN_BITS',
+      'IMPLEMENTATION_COLOR_READ_FORMAT',
+      'IMPLEMENTATION_COLOR_READ_TYPE',
+      'LINE_WIDTH',
+      'MAX_COMBINED_TEXTURE_IMAGE_UNITS',
+      'MAX_CUBE_MAP_TEXTURE_SIZE',
+      'MAX_FRAGMENT_UNIFORM_VECTORS',
+      'MAX_RENDERBUFFER_SIZE',
+      'MAX_TEXTURE_IMAGE_UNITS',
+      'MAX_TEXTURE_SIZE',
+      'MAX_VARYING_VECTORS',
+      'MAX_VERTEX_ATTRIBS',
+      'MAX_VERTEX_TEXTURE_IMAGE_UNITS',
+      'MAX_VERTEX_UNIFORM_VECTORS',
+      'MAX_VIEWPORT_DIMS',
+      'PACK_ALIGNMENT',
+      'POLYGON_OFFSET_FACTOR',
+      'POLYGON_OFFSET_FILL',
+      'POLYGON_OFFSET_UNITS',
+      'RED_BITS',
+      'RENDERBUFFER_BINDING',
+      'RENDERER',
+      'SAMPLE_ALPHA_TO_COVERAGE',
+      'SAMPLE_BUFFERS',
+      'SAMPLE_COVERAGE',
+      'SAMPLE_COVERAGE_INVERT',
+      'SAMPLE_COVERAGE_VALUE',
+      'SAMPLES',
+      'SCISSOR_BOX',
+      'SCISSOR_TEST',
+      'SHADING_LANGUAGE_VERSION',
+      'STENCIL_BACK_FAIL',
+      'STENCIL_BACK_FUNC',
+      'STENCIL_BACK_PASS_DEPTH_FAIL',
+      'STENCIL_BACK_PASS_DEPTH_PASS',
+      'STENCIL_BACK_REF',
+      'STENCIL_BACK_VALUE_MASK',
+      'STENCIL_BACK_WRITEMASK',
+      'STENCIL_BITS',
+      'STENCIL_CLEAR_VALUE',
+      'STENCIL_FAIL',
+      'STENCIL_FUNC',
+      'STENCIL_PASS_DEPTH_FAIL',
+      'STENCIL_PASS_DEPTH_PASS',
+      'STENCIL_REF',
+      'STENCIL_TEST',
+      'STENCIL_VALUE_MASK',
+      'STENCIL_WRITEMASK',
+      'SUBPIXEL_BITS',
+      'TEXTURE_BINDING_2D',
+      'TEXTURE_BINDING_CUBE_MAP',
+      'UNPACK_ALIGNMENT',
+      'UNPACK_COLORSPACE_CONVERSION_WEBGL',
+      'UNPACK_FLIP_Y_WEBGL',
+      'UNPACK_PREMULTIPLY_ALPHA_WEBGL',
+      'VENDOR',
+      'VERSION',
+      'VIEWPORT',
+      'VERSION',
+      'SHADING_LANGUAGE_VERSION',
+      'VENDOR',
+      'RENDERER'
+    ]
+
+    if (isWebGL2) {
+      pname.extends([
+        'COPY_READ_BUFFER_BINDING',
+        'COPY_WRITE_BUFFER_BINDING',
+        'DRAW_BUFFERi',
+        'DRAW_FRAMEBUFFER_BINDING',
+        'FRAGMENT_SHADER_DERIVATIVE_HINT',
+        'MAX_3D_TEXTURE_SIZE',
+        'MAX_ARRAY_TEXTURE_LAYERS',
+        'MAX_CLIENT_WAIT_TIMEOUT_WEBGL',
+        'MAX_COLOR_ATTACHMENTS',
+        'MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS',
+        'MAX_COMBINED_UNIFORM_BLOCKS',
+        'MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS',
+        'MAX_DRAW_BUFFERS',
+        'MAX_ELEMENT_INDEX',
+        'MAX_ELEMENTS_INDICE',
+        'MAX_ELEMENTS_VERTICES',
+        'MAX_FRAGMENT_INPUT_COMPONENTS',
+        'MAX_FRAGMENT_UNIFORM_BLOCKS',
+        'MAX_FRAGMENT_UNIFORM_COMPONENTS',
+        'MAX_PROGRAM_TEXEL_OFFSET',
+        'MAX_SAMPLES',
+        'MAX_SERVER_WAIT_TIMEOUT',
+        'MAX_TEXTURE_LOD_BIAS',
+        'MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS',
+        'MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS',
+        'MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS',
+        'MAX_UNIFORM_BLOCK_SIZE',
+        'MAX_UNIFORM_BUFFER_BINDINGS',
+        'MAX_VARYING_COMPONENTS',
+        'MAX_VERTEX_OUTPUT_COMPONENTS',
+        'MAX_VERTEX_UNIFORM_BLOCKS',
+        'MAX_VERTEX_UNIFORM_COMPONENTS',
+        'MIN_PROGRAM_TEXEL_OFFSET',
+        'PACK_ROW_LENGTH',
+        'PACK_SKIP_PIXELS',
+        'PACK_SKIP_ROWS',
+        'PIXEL_PACK_BUFFER_BINDING',
+        'PIXEL_UNPACK_BUFFER_BINDING',
+        'RASTERIZER_DISCARD',
+        'READ_BUFFER',
+        'READ_FRAMEBUFFER_BINDING',
+        'SAMPLER_BINDING',
+        'TEXTURE_BINDING_2D_ARRAY',
+        'TEXTURE_BINDING_3D',
+        'TRANSFORM_FEEDBACK_ACTIVE',
+        'TRANSFORM_FEEDBACK_BINDING',
+        'TRANSFORM_FEEDBACK_BUFFER_BINDING',
+        'TRANSFORM_FEEDBACK_PAUSED',
+        'UNIFORM_BUFFER_BINDING',
+        'UNIFORM_BUFFER_OFFSET_ALIGNMENT',
+        'UNPACK_IMAGE_HEIGHT',
+        'UNPACK_ROW_LENGTH',
+        'UNPACK_SKIP_IMAGES',
+        'UNPACK_SKIP_PIXELS',
+        'UNPACK_SKIP_ROWS',
+        'VERTEX_ARRAY_BINDING'
+      ])
+    }
+    return random.item(pname)
+  },
+  randomProgramParameter: () => {
+    let pname = [
+      'DELETE_STATUS',
+      'LINK_STATUS',
+      'VALIDATE_STATUS',
+      'ATTACHED_SHADERS',
+      'ACTIVE_ATTRIBUTES',
+      'ACTIVE_UNIFORMS',
+      'TRANSFORM_FEEDBACK_BUFFER_MODE',
+      'TRANSFORM_FEEDBACK_VARYINGS',
+      'ACTIVE_UNIFORM_BLOCKS'
+    ]
+    return random.item(pname)
+  },
+  randomRenderBufferParameter: () => {
+    let pname = [
+      'RENDERBUFFER_WIDTH',
+      'RENDERBUFFER_HEIGHT',
+      'RENDERBUFFER_INTERNAL_FORMAT',
+      'RENDERBUFFER_RED_SIZE',
+      'RENDERBUFFER_GREEN_SIZE',
+      'RENDERBUFFER_BLUE_SIZE',
+      'RENDERBUFFER_ALPHA_SIZE',
+      'RENDERBUFFER_DEPTH_SIZE',
+      'RENDERBUFFER_STENCIL_SIZE'
+    ]
+    return random.item(pname)
   }
 }