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import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import DeveloperError from "../Core/DeveloperError.js";
import PixelFormat from "../Core/PixelFormat.js";
import ContextLimits from "./ContextLimits.js";
import PixelDatatype from "./PixelDatatype.js";
function attachTexture(framebuffer, attachment, texture) {
const gl = framebuffer._gl;
gl.framebufferTexture2D(
gl.FRAMEBUFFER,
attachment,
texture._target,
texture._texture,
0,
);
}
function attachRenderbuffer(framebuffer, attachment, renderbuffer) {
const gl = framebuffer._gl;
gl.framebufferRenderbuffer(
gl.FRAMEBUFFER,
attachment,
gl.RENDERBUFFER,
renderbuffer._getRenderbuffer(),
);
}
/**
* Creates a framebuffer with optional initial color, depth, and stencil attachments.
* Framebuffers are used for render-to-texture effects; they allow us to render to
* textures in one pass, and read from it in a later pass.
*
* @param {object} options Object with the following properties:
* @param {Context} options.context
* @param {Texture[]} [options.colorTextures]
* @param {Renderbuffer[]} [options.colorRenderbuffers]
* @param {Texture} [options.depthTexture]
* @param {Renderbuffer} [options.depthRenderbuffer]
* @param {Renderbuffer} [options.stencilRenderbuffer]
* @param {Texture} [options.depthStencilTexture]
* @param {Renderbuffer} [options.depthStencilRenderbuffer]
* @param {boolean} [options.destroyAttachments=true] When true, the framebuffer owns its attachments so they will be destroyed when {@link Framebuffer#destroy} is called or when a new attachment is assigned to an attachment point.
*
* @exception {DeveloperError} Cannot have both color texture and color renderbuffer attachments.
* @exception {DeveloperError} Cannot have both a depth texture and depth renderbuffer attachment.
* @exception {DeveloperError} Cannot have both a depth-stencil texture and depth-stencil renderbuffer attachment.
* @exception {DeveloperError} Cannot have both a depth and depth-stencil renderbuffer.
* @exception {DeveloperError} Cannot have both a stencil and depth-stencil renderbuffer.
* @exception {DeveloperError} Cannot have both a depth and stencil renderbuffer.
* @exception {DeveloperError} The color-texture pixel-format must be a color format.
* @exception {DeveloperError} The depth-texture pixel-format must be DEPTH_COMPONENT.
* @exception {DeveloperError} The depth-stencil-texture pixel-format must be DEPTH_STENCIL.
* @exception {DeveloperError} The number of color attachments exceeds the number supported.
* @exception {DeveloperError} The color-texture pixel datatype is HALF_FLOAT and the WebGL implementation does not support the EXT_color_buffer_half_float extension.
* @exception {DeveloperError} The color-texture pixel datatype is FLOAT and the WebGL implementation does not support the EXT_color_buffer_float or WEBGL_color_buffer_float extensions.
*
* @example
* // Create a framebuffer with color and depth texture attachments.
* const width = context.canvas.clientWidth;
* const height = context.canvas.clientHeight;
* const framebuffer = new Framebuffer({
* context : context,
* colorTextures : [new Texture({
* context : context,
* width : width,
* height : height,
* pixelFormat : PixelFormat.RGBA
* })],
* depthTexture : new Texture({
* context : context,
* width : width,
* height : height,
* pixelFormat : PixelFormat.DEPTH_COMPONENT,
* pixelDatatype : PixelDatatype.UNSIGNED_SHORT
* })
* });
*
* @private
* @constructor
*/
function Framebuffer(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const context = options.context;
//>>includeStart('debug', pragmas.debug);
Check.defined("options.context", context);
//>>includeEnd('debug');
const gl = context._gl;
const maximumColorAttachments = ContextLimits.maximumColorAttachments;
this._gl = gl;
this._framebuffer = gl.createFramebuffer();
this._colorTextures = [];
this._colorRenderbuffers = [];
this._activeColorAttachments = [];
this._depthTexture = undefined;
this._depthRenderbuffer = undefined;
this._stencilRenderbuffer = undefined;
this._depthStencilTexture = undefined;
this._depthStencilRenderbuffer = undefined;
/**
* When true, the framebuffer owns its attachments so they will be destroyed when
* {@link Framebuffer#destroy} is called or when a new attachment is assigned
* to an attachment point.
*
* @type {boolean}
* @default true
*
* @see Framebuffer#destroy
*/
this.destroyAttachments = options.destroyAttachments ?? true;
// Throw if a texture and renderbuffer are attached to the same point. This won't
// cause a WebGL error (because only one will be attached), but is likely a developer error.
//>>includeStart('debug', pragmas.debug);
if (defined(options.colorTextures) && defined(options.colorRenderbuffers)) {
throw new DeveloperError(
"Cannot have both color texture and color renderbuffer attachments.",
);
}
if (defined(options.depthTexture) && defined(options.depthRenderbuffer)) {
throw new DeveloperError(
"Cannot have both a depth texture and depth renderbuffer attachment.",
);
}
if (
defined(options.depthStencilTexture) &&
defined(options.depthStencilRenderbuffer)
) {
throw new DeveloperError(
"Cannot have both a depth-stencil texture and depth-stencil renderbuffer attachment.",
);
}
// Avoid errors defined in Section 6.5 of the WebGL spec
const depthAttachment =
defined(options.depthTexture) || defined(options.depthRenderbuffer);
const depthStencilAttachment =
defined(options.depthStencilTexture) ||
defined(options.depthStencilRenderbuffer);
if (depthAttachment && depthStencilAttachment) {
throw new DeveloperError(
"Cannot have both a depth and depth-stencil attachment.",
);
}
if (defined(options.stencilRenderbuffer) && depthStencilAttachment) {
throw new DeveloperError(
"Cannot have both a stencil and depth-stencil attachment.",
);
}
if (depthAttachment && defined(options.stencilRenderbuffer)) {
throw new DeveloperError(
"Cannot have both a depth and stencil attachment.",
);
}
//>>includeEnd('debug');
this._bind();
if (defined(options.colorTextures)) {
const textures = options.colorTextures;
const length =
(this._colorTextures.length =
this._activeColorAttachments.length =
textures.length);
//>>includeStart('debug', pragmas.debug);
if (length > maximumColorAttachments) {
throw new DeveloperError(
"The number of color attachments exceeds the number supported.",
);
}
//>>includeEnd('debug');
for (let i = 0; i < length; ++i) {
const texture = textures[i];
//>>includeStart('debug', pragmas.debug);
Iif (!PixelFormat.isColorFormat(texture.pixelFormat)) {
throw new DeveloperError(
"The color-texture pixel-format must be a color format.",
);
}
if (
texture.pixelDatatype === PixelDatatype.FLOAT &&
!context.colorBufferFloat
) {
throw new DeveloperError(
"The color texture pixel datatype is FLOAT and the WebGL implementation does not support the EXT_color_buffer_float or WEBGL_color_buffer_float extensions. See Context.colorBufferFloat.",
);
}
Iif (
texture.pixelDatatype === PixelDatatype.HALF_FLOAT &&
!context.colorBufferHalfFloat
) {
throw new DeveloperError(
"The color texture pixel datatype is HALF_FLOAT and the WebGL implementation does not support the EXT_color_buffer_half_float extension. See Context.colorBufferHalfFloat.",
);
}
//>>includeEnd('debug');
const attachmentEnum = this._gl.COLOR_ATTACHMENT0 + i;
attachTexture(this, attachmentEnum, texture);
this._activeColorAttachments[i] = attachmentEnum;
this._colorTextures[i] = texture;
}
}
if (defined(options.colorRenderbuffers)) {
const renderbuffers = options.colorRenderbuffers;
const length =
(this._colorRenderbuffers.length =
this._activeColorAttachments.length =
renderbuffers.length);
//>>includeStart('debug', pragmas.debug);
if (length > maximumColorAttachments) {
throw new DeveloperError(
"The number of color attachments exceeds the number supported.",
);
}
//>>includeEnd('debug');
for (let i = 0; i < length; ++i) {
const renderbuffer = renderbuffers[i];
const attachmentEnum = this._gl.COLOR_ATTACHMENT0 + i;
attachRenderbuffer(this, attachmentEnum, renderbuffer);
this._activeColorAttachments[i] = attachmentEnum;
this._colorRenderbuffers[i] = renderbuffer;
}
}
if (defined(options.depthTexture)) {
const texture = options.depthTexture;
//>>includeStart('debug', pragmas.debug);
Eif (texture.pixelFormat !== PixelFormat.DEPTH_COMPONENT) {
throw new DeveloperError(
"The depth-texture pixel-format must be DEPTH_COMPONENT.",
);
}
//>>includeEnd('debug');
attachTexture(this, this._gl.DEPTH_ATTACHMENT, texture);
this._depthTexture = texture;
}
if (defined(options.depthRenderbuffer)) {
const renderbuffer = options.depthRenderbuffer;
attachRenderbuffer(this, this._gl.DEPTH_ATTACHMENT, renderbuffer);
this._depthRenderbuffer = renderbuffer;
}
if (defined(options.stencilRenderbuffer)) {
const renderbuffer = options.stencilRenderbuffer;
attachRenderbuffer(this, this._gl.STENCIL_ATTACHMENT, renderbuffer);
this._stencilRenderbuffer = renderbuffer;
}
if (defined(options.depthStencilTexture)) {
const texture = options.depthStencilTexture;
//>>includeStart('debug', pragmas.debug);
Eif (texture.pixelFormat !== PixelFormat.DEPTH_STENCIL) {
throw new DeveloperError(
"The depth-stencil pixel-format must be DEPTH_STENCIL.",
);
}
//>>includeEnd('debug');
attachTexture(this, this._gl.DEPTH_STENCIL_ATTACHMENT, texture);
this._depthStencilTexture = texture;
}
if (defined(options.depthStencilRenderbuffer)) {
const renderbuffer = options.depthStencilRenderbuffer;
attachRenderbuffer(this, this._gl.DEPTH_STENCIL_ATTACHMENT, renderbuffer);
this._depthStencilRenderbuffer = renderbuffer;
}
this._unBind();
}
Object.defineProperties(Framebuffer.prototype, {
/**
* The status of the framebuffer. If the status is not WebGLConstants.FRAMEBUFFER_COMPLETE,
* a {@link DeveloperError} will be thrown when attempting to render to the framebuffer.
* @memberof Framebuffer.prototype
* @type {number}
*/
status: {
get: function () {
this._bind();
const status = this._gl.checkFramebufferStatus(this._gl.FRAMEBUFFER);
this._unBind();
return status;
},
},
numberOfColorAttachments: {
get: function () {
return this._activeColorAttachments.length;
},
},
depthTexture: {
get: function () {
return this._depthTexture;
},
},
depthRenderbuffer: {
get: function () {
return this._depthRenderbuffer;
},
},
stencilRenderbuffer: {
get: function () {
return this._stencilRenderbuffer;
},
},
depthStencilTexture: {
get: function () {
return this._depthStencilTexture;
},
},
depthStencilRenderbuffer: {
get: function () {
return this._depthStencilRenderbuffer;
},
},
/**
* True if the framebuffer has a depth attachment. Depth attachments include
* depth and depth-stencil textures, and depth and depth-stencil renderbuffers. When
* rendering to a framebuffer, a depth attachment is required for the depth test to have effect.
* @memberof Framebuffer.prototype
* @type {boolean}
*/
hasDepthAttachment: {
get: function () {
return !!(
this.depthTexture ||
this.depthRenderbuffer ||
this.depthStencilTexture ||
this.depthStencilRenderbuffer
);
},
},
});
Framebuffer.prototype._bind = function () {
const gl = this._gl;
gl.bindFramebuffer(gl.FRAMEBUFFER, this._framebuffer);
};
Framebuffer.prototype._unBind = function () {
const gl = this._gl;
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
};
Framebuffer.prototype.bindDraw = function () {
const gl = this._gl;
gl.bindFramebuffer(gl.DRAW_FRAMEBUFFER, this._framebuffer);
};
Framebuffer.prototype.bindRead = function () {
const gl = this._gl;
gl.bindFramebuffer(gl.READ_FRAMEBUFFER, this._framebuffer);
};
Framebuffer.prototype._getActiveColorAttachments = function () {
return this._activeColorAttachments;
};
Framebuffer.prototype.getColorTexture = function (index) {
//>>includeStart('debug', pragmas.debug);
if (!defined(index) || index < 0 || index >= this._colorTextures.length) {
throw new DeveloperError(
"index is required, must be greater than or equal to zero and must be less than the number of color attachments.",
);
}
//>>includeEnd('debug');
return this._colorTextures[index];
};
Framebuffer.prototype.getColorRenderbuffer = function (index) {
//>>includeStart('debug', pragmas.debug);
if (
!defined(index) ||
index < 0 ||
index >= this._colorRenderbuffers.length
) {
throw new DeveloperError(
"index is required, must be greater than or equal to zero and must be less than the number of color attachments.",
);
}
//>>includeEnd('debug');
return this._colorRenderbuffers[index];
};
Framebuffer.prototype.isDestroyed = function () {
return false;
};
Framebuffer.prototype.destroy = function () {
if (this.destroyAttachments) {
// If the color texture is a cube map face, it is owned by the cube map, and will not be destroyed.
const textures = this._colorTextures;
for (let i = 0; i < textures.length; ++i) {
const texture = textures[i];
Eif (defined(texture)) {
texture.destroy();
}
}
const renderbuffers = this._colorRenderbuffers;
for (let i = 0; i < renderbuffers.length; ++i) {
const renderbuffer = renderbuffers[i];
Eif (defined(renderbuffer)) {
renderbuffer.destroy();
}
}
this._depthTexture = this._depthTexture && this._depthTexture.destroy();
this._depthRenderbuffer =
this._depthRenderbuffer && this._depthRenderbuffer.destroy();
this._stencilRenderbuffer =
this._stencilRenderbuffer && this._stencilRenderbuffer.destroy();
this._depthStencilTexture =
this._depthStencilTexture && this._depthStencilTexture.destroy();
this._depthStencilRenderbuffer =
this._depthStencilRenderbuffer &&
this._depthStencilRenderbuffer.destroy();
}
this._gl.deleteFramebuffer(this._framebuffer);
return destroyObject(this);
};
export default Framebuffer;
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