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# HelloWindow Example
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## Description
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This example showcases how to define a custom shader.
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## Expected Result
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A RGB triangle.
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## Highlighted Code Snippet
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```cpp
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class CustomShader {
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public:
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Buffer<Vector<float, 4>> colors;
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CustomShader(const std::vector<Vector<float, 4>>& colors) : colors(VK_BUFFER_USAGE_STORAGE_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, colors.size()) {
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memcpy(this->colors.value, colors.data(), colors.size()*sizeof(Vector<float, 4>));
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}
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void WriteDescriptors(VkDescriptorSet set) {
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VkWriteDescriptorSet write[1] = {
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vks::initializers::writeDescriptorSet(set, VK_DESCRIPTOR_TYPE_STORAGE_BUFFER, 0, &colors.descriptor),
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};
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vkUpdateDescriptorSets(VulkanDevice::device, 1, &write[0], 0, nullptr);
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}
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};
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```
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## How to Run
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```bash
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crafter-build -c example -r
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```
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## Relevant documentation
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