vs shader如下面格式：
//vs
#version 450
layout(binding = 0) uniform UniformBufferObject {
mat4 model;
mat4 view;
mat4 proj;
} ubo;
layout(location = 0) in vec2 inPosition;
layout(location = 1) in vec3 inColor;
layout(location = 2) in vec2 inTexCoord;
layout(location = 0) out vec3 fragColor;
layout(location = 1) out vec2 fragTexCoord;
void main() {
gl_Position = ubo.proj * ubo.view * ubo.model * vec4(inPosition, 0.0, 1.0);
fragColor = inColor;
fragTexCoord = inTexCoord;
}
具备layout(location = xx) in 格式描述的资源就是 vertex input buffer
layout(location = 0) in vec2 inPosition;
layout(location = 1) in vec3 inColor;
layout(location = 2) in vec2 inTexCoord;
对应的代码如下：
/* {inPosition, inColor, inTexCoord}*/
struct Vertex {
glm::vec2 pos;
glm::vec3 color;
glm::vec2 texCoord;
}
const std::vector<Vertex> vertices = {
{{-0.5f, -0.5f}, {1.0f, 0.0f, 0.0f}, {1.0f, 0.0f}},
{{0.5f, -0.5f}, {0.0f, 1.0f, 0.0f}, {0.0f, 0.0f}},
{{0.5f, 0.5f}, {0.0f, 0.0f, 1.0f}, {0.0f, 1.0f}},
{{-0.5f, 0.5f}, {1.0f, 1.0f, 1.0f}, {1.0f, 1.0f}}
};
//create vertex buffer
VkDeviceSize bufferSize = sizeof(vertices[0]) * vertices.size();
VkBuffer vertexBuffer;
VkDeviceMemory vertexBufferMemory;
createBuffer(bufferSize, VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT, vertexBuffer, vertexBufferMemory);
void* data;
vkMapMemory(device, vertexBufferMemory, 0, bufferSize, 0, &data);
memcpy(data, vertices.data(), (size_t) bufferSize);
vkUnmapMemory(device, vertexBufferMemory);
// create vertex input of pipeline
VkVertexInputBindingDescription bindingDescription = {.binding=0, .stride=sizeof(Vertex), .inputRate = VK_VERTEX_INPUT_RATE_VERTEX};
std::array<VkVertexInputAttributeDescription, 3> attributeDescriptions =
{
{.binding = 0, .location = 0, .format = VK_FORMAT_R32G32_SFLOAT, .offset = offsetof(Vertex, pos)},
{.binding = 0, .location = 1, .format = VK_FORMAT_R32G32B32_SFLOAT, .offset = offsetof(Vertex, color)},
{.binding = 0, .location = 2, .format = VK_FORMAT_R32G32_SFLOAT, .offset = offsetof(Vertex, texCoord)}
}
VkPipelineVertexInputStateCreateInfo vertexInputInfo{};
vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
vertexInputInfo.vertexBindingDescriptionCount = 1;
vertexInputInfo.vertexAttributeDescriptionCount = attributeDescriptions.size();
vertexInputInfo.pVertexBindingDescriptions = &bindingDescription;
vertexInputInfo.pVertexAttributeDescriptions = attributeDescriptions.data();
VkGraphicsPipelineCreateInfo pipelineInfo{};
pipelineInfo.pVertexInputState = &vertexInputInfo;
// create pipeline
VkPipeline pipeline
vkCreateGraphicsPipelines(.., &pipelineInfo, .. &pipeline);
//commandBuffer bind pipeline, vertex buffer
vkCmdBindPipeline(commandBuffer, VK_PIPELINE_BIND_POINT_GRAPHICS, pipeline);
VkBuffer vertexBuffers[] = {vertexBuffer};
VkDeviceSize offsets[] = {0};
vkCmdBindVertexBuffers(commandBuffer, 0, 1, vertexBuffers, offsets);