108 lines
3.1 KiB
Plaintext
108 lines
3.1 KiB
Plaintext
CCEffect %{
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techniques:
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- passes:
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- vert: rainbow-water-vs
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frag: rainbow-water-fs
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blendState:
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targets:
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- blend: true
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blendSrc: src_alpha
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blendDst: one_minus_src_alpha
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rasterizerState:
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cullMode: none
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depthStencilState:
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depthTest: false
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depthWrite: false
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properties:
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texture: { value: white }
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uvRect: { value: [0, 0, 1, 1] }
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uvRotated: { value: 0 }
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water: { value: [1, 0, 0.024, 0.006] }
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}%
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CCProgram rainbow-water-vs %{
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precision highp float;
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#include <cc-global>
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#include <cc-local>
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in vec3 a_position;
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in vec4 a_color;
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in vec2 a_uv0;
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out vec4 v_color;
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out vec2 v_uv0;
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void main () {
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vec4 pos = vec4(a_position, 1.0);
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#if CC_USE_MODEL
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pos = cc_matViewProj * cc_matWorld * pos;
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#else
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pos = cc_matViewProj * pos;
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#endif
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gl_Position = pos;
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v_color = a_color;
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v_uv0 = a_uv0;
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}
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}%
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CCProgram rainbow-water-fs %{
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#if CC_SUPPORT_standard_derivatives
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#extension GL_OES_standard_derivatives : enable
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#endif
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precision highp float;
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#include <texture>
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in vec4 v_color;
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in vec2 v_uv0;
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uniform sampler2D texture;
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uniform WaterProperties {
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vec4 uvRect;
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vec4 water;
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float uvRotated;
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};
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void main () {
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vec2 uv = (v_uv0 - uvRect.xy) / max(uvRect.zw, vec2(0.00001));
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if (uvRotated > 0.5) uv = vec2(uv.y, 1.0 - uv.x);
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vec4 base = vec4(1.0);
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{
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CCTexture(texture, v_uv0, base);
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}
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// 固定波形从左向右平移，瓶内颜色跟随同一波列，不在中途叠出新的凸起。
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float phase = uv.x * 7.5 - water.y * 1.8;
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float envelope = 4.0 * uv.y * (1.0 - uv.y);
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vec2 drift = vec2(0.0, 0.75 * sin(phase + uv.y * 3.0));
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vec2 flowingUV = clamp(uv + drift * water.z * envelope, vec2(0.001), vec2(0.999));
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if (uvRotated > 0.5) flowingUV = vec2(1.0 - flowingUV.y, flowingUV.x);
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vec4 flowing = vec4(1.0);
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{
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CCTexture(texture, uvRect.xy + flowingUV * uvRect.zw, flowing);
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}
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vec4 color = vec4(mix(base.rgb, flowing.rgb, flowing.a), base.a);
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// 液面沿同一方向连续推进；空瓶不残留，满瓶保持完整。
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float amplitude = water.z * smoothstep(0.0, 0.08, water.x)
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* smoothstep(0.0, 0.08, 1.0 - water.x);
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float wave = amplitude * sin(phase);
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float surface = water.x + wave;
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float height = 1.0 - uv.y;
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float distanceToSurface = height - surface;
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float feather = water.w;
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#if CC_SUPPORT_standard_derivatives
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// 按实际屏幕像素抗锯齿，缩小瓶子后液面仍能平滑跨过像素边界。
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feather = max(0.75 * fwidth(distanceToSurface), 0.00001);
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#endif
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if (water.x <= 0.0) {
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color.a = 0.0;
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} else if (water.x < 1.0) {
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color.a *= 1.0 - smoothstep(-feather, feather, distanceToSurface);
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float rim = 1.0 - smoothstep(0.0, feather, abs(distanceToSurface));
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color.rgb = mix(color.rgb, vec3(1.0, 0.98, 0.88), rim * 0.08);
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}
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color *= v_color;
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#if USE_BGRA
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gl_FragColor = color.bgra;
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#else
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gl_FragColor = color;
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#endif
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}
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}%
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