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18_vertex_buffer.diff
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18_vertex_buffer.diff
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diff --git a/../steps/17_vertex_input/main.go b/../steps/18_vertex_buffer/main.go
index 84e3c8d..f858178 100644
--- a/../steps/17_vertex_input/main.go
+++ b/../steps/18_vertex_buffer/main.go
@@ -1,7 +1,9 @@
package main
import (
+ "bytes"
"embed"
+ "encoding/binary"
"github.com/pkg/errors"
"github.com/veandco/go-sdl2/sdl"
"github.com/vkngwrapper/core/v2"
@@ -116,6 +118,9 @@ type HelloTriangleApplication struct {
inFlightFence []core1_0.Fence
imagesInFlight []core1_0.Fence
currentFrame int
+
+ vertexBuffer core1_0.Buffer
+ vertexBufferMemory core1_0.DeviceMemory
}
func (app *HelloTriangleApplication) Run() error {
@@ -208,6 +213,11 @@ func (app *HelloTriangleApplication) initVulkan() error {
return err
}
+ err = app.createVertexBuffer()
+ if err != nil {
+ return err
+ }
+
err = app.createCommandBuffers()
if err != nil {
return err
@@ -294,6 +304,14 @@ func (app *HelloTriangleApplication) cleanupSwapChain() {
func (app *HelloTriangleApplication) cleanup() {
app.cleanupSwapChain()
+ if app.vertexBuffer != nil {
+ app.vertexBuffer.Destroy(nil)
+ }
+
+ if app.vertexBufferMemory != nil {
+ app.vertexBufferMemory.Free(nil)
+ }
+
for _, fence := range app.inFlightFence {
fence.Destroy(nil)
}
@@ -879,6 +897,69 @@ func (app *HelloTriangleApplication) createCommandPool() error {
return nil
}
+func (app *HelloTriangleApplication) createVertexBuffer() error {
+ var err error
+ bufferSize := binary.Size(vertices)
+ app.vertexBuffer, _, err = app.device.CreateBuffer(nil, core1_0.BufferCreateInfo{
+ Size: bufferSize,
+ Usage: core1_0.BufferUsageVertexBuffer,
+ SharingMode: core1_0.SharingModeExclusive,
+ })
+ if err != nil {
+ return err
+ }
+
+ memRequirements := app.vertexBuffer.MemoryRequirements()
+ memoryTypeIndex, err := app.findMemoryType(memRequirements.MemoryTypeBits, core1_0.MemoryPropertyHostVisible|core1_0.MemoryPropertyHostCoherent)
+ if err != nil {
+ return err
+ }
+
+ app.vertexBufferMemory, _, err = app.device.AllocateMemory(nil, core1_0.MemoryAllocateInfo{
+ AllocationSize: memRequirements.Size,
+ MemoryTypeIndex: memoryTypeIndex,
+ })
+ if err != nil {
+ return err
+ }
+
+ _, err = app.vertexBuffer.BindBufferMemory(app.vertexBufferMemory, 0)
+ if err != nil {
+ return err
+ }
+
+ memory, _, err := app.vertexBufferMemory.Map(0, bufferSize, 0)
+ if err != nil {
+ return err
+ }
+ defer app.vertexBufferMemory.Unmap()
+
+ dataBuffer := unsafe.Slice((*byte)(memory), bufferSize)
+
+ buf := &bytes.Buffer{}
+ err = binary.Write(buf, common.ByteOrder, vertices)
+ if err != nil {
+ return err
+ }
+
+ copy(dataBuffer, buf.Bytes())
+
+ return nil
+}
+
+func (app *HelloTriangleApplication) findMemoryType(typeFilter uint32, properties core1_0.MemoryPropertyFlags) (int, error) {
+ memProperties := app.physicalDevice.MemoryProperties()
+ for i, memoryType := range memProperties.MemoryTypes {
+ typeBit := uint32(1 << i)
+
+ if (typeFilter&typeBit) != 0 && (memoryType.PropertyFlags&properties) == properties {
+ return i, nil
+ }
+ }
+
+ return 0, errors.New("failed to find any suitable memory type!")
+}
+
func (app *HelloTriangleApplication) createCommandBuffers() error {
buffers, _, err := app.device.AllocateCommandBuffers(core1_0.CommandBufferAllocateInfo{
@@ -914,7 +995,8 @@ func (app *HelloTriangleApplication) createCommandBuffers() error {
}
buffer.CmdBindPipeline(core1_0.PipelineBindPointGraphics, app.graphicsPipeline)
- buffer.CmdDraw(3, 1, 0, 0)
+ buffer.CmdBindVertexBuffers(0, []core1_0.Buffer{app.vertexBuffer}, []int{0})
+ buffer.CmdDraw(len(vertices), 1, 0, 0)
buffer.CmdEndRenderPass()
_, err = buffer.End()