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Add Texture.canUse[Half]FloatingPointRTT(). #14

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Add Texture.canUse[Half]FloatingPointRTT(). #14

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14 changes: 14 additions & 0 deletions lightgl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1905,6 +1905,13 @@ Texture.canUseFloatingPointLinearFiltering = function() {
return !!gl.getExtension('OES_texture_float_linear');
};

// ### GL.Texture.canUseFloatingPointRTT()
//
// Returns false if float32 textures can't be rendered to.
Texture.canUseFloatingPointRTT = function() {
return !!gl.getExtension('WEBGL_color_buffer_float');
};

// ### GL.Texture.canUseFloatingPointTextures()
//
// Returns false if `gl.HALF_FLOAT_OES` is not supported as a texture type.
Expand All @@ -1922,6 +1929,13 @@ Texture.canUseHalfFloatingPointLinearFiltering = function() {
return !!gl.getExtension('OES_texture_half_float_linear');
};

// ### GL.Texture.canUseHalfFloatingPointRTT()
//
// Returns false if float16 textures can't be rendered to.
Texture.canUseHalfFloatingPointRTT = function() {
return !!gl.getExtension('EXT_color_buffer_half_float');
};

// src/vector.js
// Provides a simple 3D vector class. Vector operations can be done using member
// functions, which return new vectors, or static functions, which reuse
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7 changes: 4 additions & 3 deletions water.js
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Expand Up @@ -16,17 +16,18 @@ function Water() {
}\
';
this.plane = GL.Mesh.plane();
if (!GL.Texture.canUseFloatingPointTextures()) {
throw new Error('This demo requires the OES_texture_float extension');
if (!GL.Texture.canUseFloatingPointRTT() && !GL.Texture.canUseHalfFloatingPointRTT()) {
throw new Error('This demo requires either the WEBGL_color_buffer_float or the EXT_color_buffer_half_float extension');
}
var filter = GL.Texture.canUseFloatingPointLinearFiltering() ? gl.LINEAR : gl.NEAREST;
this.textureA = new GL.Texture(256, 256, { type: gl.FLOAT, filter: filter });
this.textureB = new GL.Texture(256, 256, { type: gl.FLOAT, filter: filter });
if ((!this.textureA.canDrawTo() || !this.textureB.canDrawTo()) && GL.Texture.canUseHalfFloatingPointTextures()) {
if ((!this.textureA.canDrawTo() || !this.textureB.canDrawTo()) && GL.Texture.canUseHalfFloatingPointRTT()) {
filter = GL.Texture.canUseHalfFloatingPointLinearFiltering() ? gl.LINEAR : gl.NEAREST;
this.textureA = new GL.Texture(256, 256, { type: gl.HALF_FLOAT_OES, filter: filter });
this.textureB = new GL.Texture(256, 256, { type: gl.HALF_FLOAT_OES, filter: filter });
}

this.dropShader = new GL.Shader(vertexShader, '\
const float PI = 3.141592653589793;\
uniform sampler2D texture;\
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