WEBGL_draw_buffers extension
The WEBGL_draw_buffers
extension is part of the WebGL API and enables a fragment shader to write to several textures, which is useful for deferred shading, for example.
WebGL extensions are available using the WebGLRenderingContext.getExtension()
method. For more information, see also Using Extensions in the WebGL tutorial.
Constants
This extension exposes new constants, which can be used in the gl.framebufferRenderbuffer()
, gl.framebufferTexture2D()
, gl.getFramebufferAttachmentParameter()
ext.drawBuffersWEBGL()
, and gl.getParameter()
methods.
ext.COLOR_ATTACHMENT0_WEBGL ext.COLOR_ATTACHMENT1_WEBGL ext.COLOR_ATTACHMENT2_WEBGL ext.COLOR_ATTACHMENT3_WEBGL ext.COLOR_ATTACHMENT4_WEBGL ext.COLOR_ATTACHMENT5_WEBGL ext.COLOR_ATTACHMENT6_WEBGL ext.COLOR_ATTACHMENT7_WEBGL ext.COLOR_ATTACHMENT8_WEBGL ext.COLOR_ATTACHMENT9_WEBGL ext.COLOR_ATTACHMENT10_WEBGL ext.COLOR_ATTACHMENT11_WEBGL ext.COLOR_ATTACHMENT12_WEBGL ext.COLOR_ATTACHMENT13_WEBGL ext.COLOR_ATTACHMENT14_WEBGL ext.COLOR_ATTACHMENT15_WEBGL
-
A
GLenum
specifying a color buffer. ext.DRAW_BUFFER0_WEBGL ext.DRAW_BUFFER1_WEBGL ext.DRAW_BUFFER2_WEBGL ext.DRAW_BUFFER3_WEBGL ext.DRAW_BUFFER4_WEBGL ext.DRAW_BUFFER5_WEBGL ext.DRAW_BUFFER6_WEBGL ext.DRAW_BUFFER7_WEBGL ext.DRAW_BUFFER8_WEBGL ext.DRAW_BUFFER9_WEBGL ext.DRAW_BUFFER10_WEBGL ext.DRAW_BUFFER11_WEBGL ext.DRAW_BUFFER12_WEBGL ext.DRAW_BUFFER13_WEBGL ext.DRAW_BUFFER14_WEBGL ext.DRAW_BUFFER15_WEBGL
-
A
GLenum
returning a draw buffer. ext.MAX_COLOR_ATTACHMENTS_WEBGL
-
A
GLint
indicating the maximum number of framebuffer color attachment points. ext.MAX_DRAW_BUFFERS_WEBGL
-
A
GLint
indicating the maximum number of draw buffers.
Instance methods
This extension exposes one new method.
ext.drawBuffersWEBGL()
-
Defines the draw buffers to which all fragment colors are written. (When using
WebGL2
, this method is available asgl.drawBuffers()
by default).
Examples
Enabling the extension:
const ext = gl.getExtension("WEBGL_draw_buffers");
Binding multiple textures (to a tx[]
array) to different framebuffer color attachments:
const fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(
gl.FRAMEBUFFER,
ext.COLOR_ATTACHMENT0_WEBGL,
gl.TEXTURE_2D,
tx[0],
0,
);
gl.framebufferTexture2D(
gl.FRAMEBUFFER,
ext.COLOR_ATTACHMENT1_WEBGL,
gl.TEXTURE_2D,
tx[1],
0,
);
gl.framebufferTexture2D(
gl.FRAMEBUFFER,
ext.COLOR_ATTACHMENT2_WEBGL,
gl.TEXTURE_2D,
tx[2],
0,
);
gl.framebufferTexture2D(
gl.FRAMEBUFFER,
ext.COLOR_ATTACHMENT3_WEBGL,
gl.TEXTURE_2D,
tx[3],
0,
);
Mapping the color attachments to draw buffer slots that the fragment shader will write to using gl_FragData
:
ext.drawBuffersWEBGL([
ext.COLOR_ATTACHMENT0_WEBGL, // gl_FragData[0]
ext.COLOR_ATTACHMENT1_WEBGL, // gl_FragData[1]
ext.COLOR_ATTACHMENT2_WEBGL, // gl_FragData[2]
ext.COLOR_ATTACHMENT3_WEBGL, // gl_FragData[3]
]);
Shader code that writes to multiple textures:
<script type="x-shader/x-fragment">
#extension GL_EXT_draw_buffers : require
precision highp float;
void main(void) {
gl_FragData[0] = vec4(0.25);
gl_FragData[1] = vec4(0.5);
gl_FragData[2] = vec4(0.75);
gl_FragData[3] = vec4(1.0);
}
</script>
Specifications
Specification |
---|
WebGL WEBGL_draw_buffers Khronos Ratified Extension Specification |
Browser compatibility
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