Never tried that myself but from OpenGL ES 2.x you could assign two
textures to a fragment shader that gradually achieves that blending effect
over time. The simplest blending effect would be linear, which has the
basic formula:
P_mix = P_a * (1 - t) + P_b * t
where...
- P_a would be the RGB color channel values of texture A
- P_b the color channel values of texture B
- t would be a time factor ranging from 0 to 1 and
- P_mix is the blended result.
Now my GLSL skills are a bit rusty at the moment. It may look like the
following (without any lighting calculations):
uniform sampler2D texA;
uniform sampler2D texB;
uniform float t;
varying vec2 texCoord;
void main() {
vec4 pA = texture2D(texA, texCoord);
vec4 pB = texture2D(texB, texCoord);
vec4 pMix = pA * (1.0 - t) + pB * t;
gl_FragColor = pMix;
}
>From your host app you'd need to animate the uniform value t over time.
On Wednesday, December 24, 2014 4:23:22 AM UTC-8, MobileVisuals wrote:
>
> I want to switch from the first texture to the other one with a gradual
> fading effect. How can I do that?
>
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