mirror of
https://github.com/bloeys/nmage.git
synced 2025-12-29 13:28:20 +00:00
336 lines
8.9 KiB
Go
Executable File
336 lines
8.9 KiB
Go
Executable File
package assets
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import (
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"bytes"
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"fmt"
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"image"
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"image/jpeg"
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"image/png"
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"io"
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"os"
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"path"
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"strings"
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"unsafe"
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"github.com/go-gl/gl/v4.1-core/gl"
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"github.com/mandykoh/prism"
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)
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type ColorFormat int
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const (
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ColorFormat_Unknown ColorFormat = iota
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ColorFormat_RGBA8
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)
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var (
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DefaultBlackTexId Texture
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DefaultWhiteTexId Texture
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DefaultDiffuseTexId Texture
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DefaultSpecularTexId Texture
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DefaultNormalTexId Texture
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DefaultEmissionTexId Texture
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)
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type Texture struct {
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// Path only exists for textures loaded from disk
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Path string
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TexID uint32
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// Width is the width of the texture in pixels (pixels per row).
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// Note that the number of bytes constituting a row is MORE than this (e.g. for RGBA8, bytesPerRow=width*4, since we have 4 bytes per pixel)
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Width int32
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// Height is the height of the texture in pixels (pixels per column).
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// Note that the number of bytes constituting a column is MORE than this (e.g. for RGBA8, bytesPerColumn=height*4, since we have 4 bytes per pixel)
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Height int32
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// Pixels usually stored in RGBA format
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Pixels []byte
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}
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type TextureLoadOptions struct {
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TryLoadFromCache bool
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WriteToCache bool
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GenMipMaps bool
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KeepPixelsInMem bool
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NoSrgba bool
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}
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type Cubemap struct {
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// These only exists for textures loaded from disk
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RightPath string
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LeftPath string
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TopPath string
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BotPath string
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FrontPath string
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BackPath string
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TexID uint32
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}
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func LoadTexturePNG(file string, loadOptions *TextureLoadOptions) (Texture, error) {
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if loadOptions == nil {
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loadOptions = &TextureLoadOptions{}
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}
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if loadOptions.TryLoadFromCache {
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if tex, ok := GetTextureFromCachePath(file); ok {
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return tex, nil
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}
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}
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//Load from disk
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fileBytes, err := os.ReadFile(file)
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if err != nil {
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return Texture{}, err
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}
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bytesReader := bytes.NewReader(fileBytes)
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img, err := png.Decode(bytesReader)
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if err != nil {
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return Texture{}, err
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}
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nrgbaImg := prism.ConvertImageToNRGBA(img, 2)
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tex := Texture{
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Path: file,
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Pixels: nrgbaImg.Pix,
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Width: int32(nrgbaImg.Bounds().Dx()),
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Height: int32(nrgbaImg.Bounds().Dy()),
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}
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flipImgPixelsVertically(tex.Pixels, int(tex.Width), int(tex.Height), 4)
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//Prepare opengl stuff
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gl.GenTextures(1, &tex.TexID)
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gl.BindTexture(gl.TEXTURE_2D, tex.TexID)
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// set the texture wrapping/filtering options (on the currently bound texture object)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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// load and generate the texture
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internalFormat := int32(gl.SRGB_ALPHA)
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if loadOptions.NoSrgba {
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internalFormat = gl.RGBA8
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}
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gl.TexImage2D(gl.TEXTURE_2D, 0, internalFormat, tex.Width, tex.Height, 0, gl.RGBA, gl.UNSIGNED_BYTE, unsafe.Pointer(&tex.Pixels[0]))
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if loadOptions.GenMipMaps {
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gl.GenerateMipmap(tex.TexID)
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}
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if loadOptions.WriteToCache {
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AddTextureToCache(tex)
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}
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if !loadOptions.KeepPixelsInMem {
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tex.Pixels = nil
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}
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return tex, nil
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}
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func LoadTextureInMemPngImg(img image.Image, loadOptions *TextureLoadOptions) (Texture, error) {
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if loadOptions == nil {
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loadOptions = &TextureLoadOptions{}
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}
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nrgbaImg := prism.ConvertImageToNRGBA(img, 2)
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tex := Texture{
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Path: "",
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Pixels: nrgbaImg.Pix,
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Height: int32(nrgbaImg.Bounds().Dy()),
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Width: int32(nrgbaImg.Bounds().Dx()),
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}
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flipImgPixelsVertically(tex.Pixels, int(tex.Width), int(tex.Height), 4)
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//Prepare opengl stuff
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gl.GenTextures(1, &tex.TexID)
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gl.BindTexture(gl.TEXTURE_2D, tex.TexID)
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// set the texture wrapping/filtering options (on the currently bound texture object)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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// load and generate the texture
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internalFormat := int32(gl.SRGB_ALPHA)
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if loadOptions.NoSrgba {
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internalFormat = gl.RGBA8
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}
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gl.TexImage2D(gl.TEXTURE_2D, 0, internalFormat, tex.Width, tex.Height, 0, gl.RGBA, gl.UNSIGNED_BYTE, unsafe.Pointer(&tex.Pixels[0]))
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if loadOptions.GenMipMaps {
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gl.GenerateMipmap(tex.TexID)
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}
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if loadOptions.WriteToCache {
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AddTextureToCache(tex)
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}
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if !loadOptions.KeepPixelsInMem {
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tex.Pixels = nil
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}
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return tex, nil
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}
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func LoadTextureJpeg(file string, loadOptions *TextureLoadOptions) (Texture, error) {
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if loadOptions == nil {
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loadOptions = &TextureLoadOptions{}
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}
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if loadOptions.TryLoadFromCache {
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if tex, ok := GetTextureFromCachePath(file); ok {
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return tex, nil
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}
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}
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//Load from disk
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fileBytes, err := os.ReadFile(file)
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if err != nil {
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return Texture{}, err
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}
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img, err := jpeg.Decode(bytes.NewReader(fileBytes))
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if err != nil {
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return Texture{}, err
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}
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nrgbaImg := prism.ConvertImageToNRGBA(img, 2)
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tex := Texture{
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Path: file,
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Pixels: nrgbaImg.Pix,
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Height: int32(nrgbaImg.Bounds().Dy()),
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Width: int32(nrgbaImg.Bounds().Dx()),
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}
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flipImgPixelsVertically(tex.Pixels, int(tex.Width), int(tex.Height), 4)
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//Prepare opengl stuff
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gl.GenTextures(1, &tex.TexID)
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gl.BindTexture(gl.TEXTURE_2D, tex.TexID)
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// set the texture wrapping/filtering options (on the currently bound texture object)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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// load and generate the texture
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internalFormat := int32(gl.SRGB_ALPHA)
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if loadOptions.NoSrgba {
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internalFormat = gl.RGBA8
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}
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gl.TexImage2D(gl.TEXTURE_2D, 0, internalFormat, tex.Width, tex.Height, 0, gl.RGBA, gl.UNSIGNED_BYTE, unsafe.Pointer(&tex.Pixels[0]))
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if loadOptions.GenMipMaps {
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gl.GenerateMipmap(tex.TexID)
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}
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if loadOptions.WriteToCache {
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AddTextureToCache(tex)
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}
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if !loadOptions.KeepPixelsInMem {
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tex.Pixels = nil
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}
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return tex, nil
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}
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// LoadCubemapTextures only supports the 'TextureIsSrgba' option
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func LoadCubemapTextures(rightTex, leftTex, topTex, botTex, frontTex, backTex string, loadOptions *TextureLoadOptions) (Cubemap, error) {
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if loadOptions == nil {
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loadOptions = &TextureLoadOptions{}
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}
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var imgDecoder func(r io.Reader) (image.Image, error)
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ext := strings.ToLower(path.Ext(rightTex))
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if ext == ".jpg" || ext == ".jpeg" {
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imgDecoder = jpeg.Decode
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} else if ext == ".png" {
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imgDecoder = png.Decode
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} else {
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return Cubemap{}, fmt.Errorf("unknown image extension: %s. Expected one of: .jpg, .jpeg, .png", ext)
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}
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cmap := Cubemap{
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RightPath: rightTex,
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LeftPath: leftTex,
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TopPath: topTex,
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BotPath: botTex,
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FrontPath: frontTex,
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BackPath: backTex,
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}
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gl.GenTextures(1, &cmap.TexID)
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gl.BindTexture(gl.TEXTURE_CUBE_MAP, cmap.TexID)
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// The order here matters
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texturePaths := []string{rightTex, leftTex, topTex, botTex, frontTex, backTex}
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for i := uint32(0); i < uint32(len(texturePaths)); i++ {
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fPath := texturePaths[i]
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//Load from disk
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fileBytes, err := os.ReadFile(fPath)
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if err != nil {
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return Cubemap{}, err
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}
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img, err := imgDecoder(bytes.NewReader(fileBytes))
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if err != nil {
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return Cubemap{}, err
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}
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nrgbaImg := prism.ConvertImageToNRGBA(img, 2)
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height := int32(nrgbaImg.Bounds().Dy())
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width := int32(nrgbaImg.Bounds().Dx())
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internalFormat := int32(gl.SRGB_ALPHA)
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if loadOptions.NoSrgba {
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internalFormat = gl.RGBA8
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}
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gl.TexImage2D(uint32(gl.TEXTURE_CUBE_MAP_POSITIVE_X)+i, 0, internalFormat, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_BYTE, unsafe.Pointer(&nrgbaImg.Pix[0]))
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}
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// set the texture wrapping/filtering options (on the currently bound texture object)
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gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
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gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
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gl.TexParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE)
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return cmap, nil
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}
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func flipImgPixelsVertically(bytes []byte, width, height, bytesPerPixel int) {
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// Flip the image vertically such that (e.g. in an image of 10 rows) rows 0<->9, 1<->8, 2<->7 etc are swapped.
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// We do this because images are usually stored top-left to bottom-right, while opengl stores textures bottom-left to top-right, so if we don't swap
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// rows textures will appear inverted
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widthInBytes := width * bytesPerPixel
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rowData := make([]byte, width*bytesPerPixel)
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for rowNum := 0; rowNum < height/2; rowNum++ {
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upperRowStartIndex := rowNum * widthInBytes
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lowerRowStartIndex := (height - rowNum - 1) * widthInBytes
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copy(rowData, bytes[upperRowStartIndex:upperRowStartIndex+widthInBytes])
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copy(bytes[upperRowStartIndex:upperRowStartIndex+widthInBytes], bytes[lowerRowStartIndex:lowerRowStartIndex+widthInBytes])
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copy(bytes[lowerRowStartIndex:lowerRowStartIndex+widthInBytes], rowData)
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}
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}
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