85 lines
2.6 KiB
Plaintext
85 lines
2.6 KiB
Plaintext
material {
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name : TextureProjection,
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parameters : [
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{
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type : sampler2d,
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name : color,
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precision: high
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},
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{
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type : bool,
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name : flipUVs
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}
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],
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variables : [
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{
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name : screenPos,
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precision : high
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}
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],
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requires : [ position, uv0 ],
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shadingModel : unlit,
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doubleSided : false,
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blending: transparent,
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depthWrite : true,
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depthCulling : false,
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culling: none,
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vertexDomain: device
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}
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//
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// This material projects a rendered color buffer texture onto a mesh.
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//
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// This allows you to texture the mesh by retrieving the output of this shader pass.
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//
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// We do this by:
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// 1) calculating the screenspace position of each vertex (VS)
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// 2) transforming each vertex to its UV coordinate (VS)
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// 3) at each UV coordinate, sampling from the input buffer at the screenspace position (FS).
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//
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// In a vertex shader, Filament sets gl_Position after materialVertex(..) is called, meaning we cannot change the vertex positions ourselves.
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// To achieve the same effect, we set the vertexDomain to device and set clipSpaceTransform.
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//
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vertex {
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void materialVertex(inout MaterialVertexInputs material) {
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mat4 transform = getWorldFromModelMatrix();
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vec3 position = getPosition().xyz;
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vec4 worldPosition = mulMat4x4Float3(transform, position);
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vec4 clipSpace = getClipFromWorldMatrix() * worldPosition;
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material.screenPos = clipSpace;
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highp float2 uv = material.uv0;
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if(materialParams.flipUVs) {
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uv = uvToRenderTargetUV(uv);
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}
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// Transform UVs (0 to 1) to clip space (-1 to 1 range)
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// UV (0,0) maps to (-1,-1) and UV (1,1) maps to (1,1)
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vec2 clipPosition = uv * 2.0 - 1.0;
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material.clipSpaceTransform = mat4(
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vec4(0.0, 0.0, 0.0, 0.0),
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vec4(0.0, 0.0, 0.0, 0.0),
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vec4(0.0, 0.0, 0.0, 0.0),
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vec4(clipPosition.x, clipPosition.y, 0.0, 1.0)
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);
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}
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}
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fragment {
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void material(inout MaterialInputs material) {
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prepareMaterial(material);
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vec2 texCoords = variable_screenPos.xy / variable_screenPos.w;
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texCoords = texCoords * 0.5 + 0.5;
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vec2 texSize = vec2(textureSize(materialParams_color, 0));
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//float textureAspectRatio = texSize.x / texSize.y;
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//texCoords.x *= textureAspectRatio;
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vec4 color = textureLod(materialParams_color, uvToRenderTargetUV(texCoords.xy), 0.0f);
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material.baseColor = color;
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}
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} |