marvin/go-game
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Removed shader, added 3D rendering (no demo yet, coming next), started bitmap font rendering, a few fixes and improvements.

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This commit is contained in:
Marvin Blum
2016-05-07 20:26:36 +02:00
parent 1d974566de
commit 139e668233
15 changed files with 809 additions and 106 deletions
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8
README.md
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@@ -5,7 +5,11 @@ Game engine written in Go using OpenGL and GLFW. Mostly for 2D rendering, but al
## Install
go-game requires OpenGL and GLFW. The following three steps install everything you need:
```
go get github.com/go-gl/gl/v4.5-core/gl
go get github.com/go-gl/glfw/v3.1/glfw
go get github.com/DeKugelschieber/go-game
```
@@ -23,3 +27,7 @@ You can find some examples within the demo folder. For full reference visit: htt
- 3.1
To use an older GL version, you need to replace the GL imports in package goga. It should mostly be compatible down to 3.x.
## License
MIT

53
demo/model/assets/cube.ply Normal file
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@@ -0,0 +1,53 @@
ply
format ascii 1.0
comment Created by Blender 2.69 (sub 0) - www.blender.org, source file: ''
element vertex 26
property float x
property float y
property float z
property float nx
property float ny
property float nz
property float s
property float t
element face 12
property list uchar uint vertex_indices
end_header
1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000 0.499999 0.500000
1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000 0.499999 0.749956
-1.000000 -1.000000 -1.000000 0.000000 0.000000 -1.000000 0.250043 0.749957
1.000000 0.999999 1.000000 -0.000000 -0.000000 1.000000 0.499998 0.250043
-1.000000 1.000000 1.000000 -0.000000 -0.000000 1.000000 0.250041 0.250044
0.999999 -1.000001 1.000000 -0.000000 -0.000000 1.000000 0.499996 0.000087
1.000000 1.000000 -1.000000 1.000000 0.000000 -0.000000 0.749956 0.749956
1.000000 0.999999 1.000000 1.000000 0.000000 -0.000000 0.749956 0.999913
1.000000 -1.000000 -1.000000 1.000000 0.000000 -0.000000 0.499999 0.749956
1.000000 -1.000000 -1.000000 -0.000000 -1.000000 -0.000000 0.499999 0.749956
0.999999 -1.000001 1.000000 -0.000000 -1.000000 -0.000000 0.500000 0.999913
-1.000000 -1.000000 -1.000000 -0.000000 -1.000000 -0.000000 0.250043 0.749957
-1.000000 -1.000000 -1.000000 -1.000000 0.000000 -0.000000 0.250043 0.749957
-1.000000 -1.000000 1.000000 -1.000000 0.000000 -0.000000 0.250043 0.999913
-1.000000 1.000000 1.000000 -1.000000 0.000000 -0.000000 0.000087 0.999913
1.000000 0.999999 1.000000 0.000000 1.000000 0.000000 0.499998 0.250043
1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000 0.499999 0.500000
-1.000000 1.000000 1.000000 0.000000 1.000000 0.000000 0.250041 0.250044
-1.000000 1.000000 -1.000000 0.000000 0.000000 -1.000000 0.250042 0.500001
1.000000 0.999999 1.000000 1.000000 -0.000001 0.000000 0.749956 0.999913
0.999999 -1.000001 1.000000 1.000000 -0.000001 0.000000 0.500000 0.999913
1.000000 -1.000000 -1.000000 1.000000 -0.000001 0.000000 0.499999 0.749956
-1.000000 1.000000 -1.000000 0.000000 1.000000 0.000000 0.250042 0.500001
-1.000000 -1.000000 1.000000 0.000000 -0.000000 1.000000 0.250040 0.000088
-1.000000 1.000000 -1.000000 -1.000000 0.000000 -0.000000 0.000087 0.749957
-1.000000 -1.000000 1.000000 -0.000000 -1.000000 0.000000 0.250043 0.999913
3 0 1 2
3 3 4 5
3 6 7 8
3 9 10 11
3 12 13 14
3 15 16 17
3 18 0 2
3 19 20 21
3 16 22 17
3 4 23 5
3 24 12 14
3 10 25 11

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demo/model/assets/cube.png Normal file
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117
game.go
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@@ -22,14 +22,15 @@ const (
Default_shader_2D_model = "m"
Default_shader_2D_tex = "tex"
// source for 2D shader
default_shader_2d_vertex_src = `#version 130
uniform mat3 o, m;
in vec2 vertex;
in vec2 texCoord;
out vec2 tc;
void main(){
tc = texCoord;
gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
tc = texCoord;
gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
}`
default_shader_2d_fragment_src = `#version 130
precision highp float;
@@ -37,7 +38,61 @@ const (
in vec2 tc;
out vec4 color;
void main(){
color = texture(tex, tc);
color = texture(tex, tc);
}`
// constants for default 3D shader
Default_shader_3D_vertex_attrib = "vertex"
Default_shader_3D_texcoord_attrib = "texCoord"
Default_shader_3D_pv = "pv"
Default_shader_3D_model = "m"
Default_shader_3D_tex = "tex"
// source for 3D shader
default_shader_3d_vertex_src = `#version 130
uniform mat4 pv, m;
in vec3 vertex;
in vec2 texCoord;
out vec2 tc;
void main(){
tc = texCoord;
gl_Position = pv*m*vec4(vertex, 1.0);
}`
default_shader_3d_fragment_src = `#version 130
precision highp float;
uniform sampler2D tex;
in vec2 tc;
out vec4 color;
void main(){
color = texture(tex, tc);
}`
// constants for default text shader
Default_shader_text_vertex_attrib = "vertex"
Default_shader_text_texcoord_attrib = "texCoord"
Default_shader_text_ortho = "o"
Default_shader_text_model = "m"
Default_shader_text_tex = "tex"
Default_shader_text_color = "color"
// source for text shader
default_shader_text_vertex_src = `#version 130
uniform mat3 o, m;
in vec2 vertex;
in vec2 texCoord;
out vec2 tc;
void main(){
tc = texCoord;
gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
}`
default_shader_text_fragment_src = `#version 130
precision highp float;
uniform sampler2D tex;
uniform vec4 color;
in vec2 tc;
out vec4 c;
void main(){
c = texture(tex, tc)*color;
}`
)
@@ -73,8 +128,10 @@ var (
viewportHeight int
// Default resources
DefaultCamera *Camera
Default2DShader *Shader
DefaultCamera *Camera
Default2DShader *Shader
Default3DShader *Shader
DefaultTextShader *Shader
)
func init() {
@@ -211,7 +268,7 @@ func initGoga(width, height int) {
DefaultCamera.CalcRatio()
DefaultCamera.CalcOrtho()
// default shader
// default 2D shader
shader, err := NewShader(default_shader_2d_vertex_src, default_shader_2d_fragment_src)
if err != nil {
@@ -222,25 +279,52 @@ func initGoga(width, height int) {
Default2DShader.BindAttrib(Default_shader_2D_vertex_attrib)
Default2DShader.BindAttrib(Default_shader_2D_texcoord_attrib)
// default 3D shader
shader, err = NewShader(default_shader_3d_vertex_src, default_shader_3d_fragment_src)
if err != nil {
panic(err)
}
Default3DShader = shader
Default3DShader.BindAttrib(Default_shader_3D_vertex_attrib)
Default3DShader.BindAttrib(Default_shader_3D_texcoord_attrib)
// default text shader
shader, err = NewShader(default_shader_text_vertex_src, default_shader_text_fragment_src)
if err != nil {
panic(err)
}
DefaultTextShader = shader
DefaultTextShader.BindAttrib(Default_shader_text_vertex_attrib)
DefaultTextShader.BindAttrib(Default_shader_text_texcoord_attrib)
// settings and registration
ClearColorBuffer(true)
EnableAlphaBlending(true)
AddLoader(&PngLoader{gl.LINEAR, false})
AddLoader(&PlyLoader{gl.STATIC_DRAW})
AddSystem(NewSpriteRenderer(nil, nil, false))
AddSystem(NewModelRenderer(nil, nil, false))
AddSystem(NewCulling2D(0, 0, width, height))
}
func cleanup() {
// cleanup resources
log.Printf("Cleaning up %v resources", len(resources))
log.Printf("Trying to cleaning up %v resources", len(resources))
dropped := 0
for _, res := range resources {
if drop, ok := res.(Dropable); ok {
drop.Drop()
dropped++
}
}
log.Printf("Dropped %v resources", dropped)
// cleanup systems
log.Printf("Cleaning up %v systems", len(systems))
@@ -259,6 +343,7 @@ func cleanup() {
log.Print("Cleaning up default resources")
Default2DShader.Drop()
DefaultTextShader.Drop()
}
// Stops the game and closes the window.
@@ -287,6 +372,15 @@ func ClearDepthBuffer(do bool) {
}
}
func removeClearBuffer(buffer uint32) {
for i, b := range clearBuffer {
if b == buffer {
clearBuffer = append(clearBuffer[:i], clearBuffer[i+1:]...)
return
}
}
}
// Enables/Disables alpha blending by source alpha channel.
// BLEND = SRC_ALPHA | ONE_MINUS_SRC_ALPHA
func EnableAlphaBlending(enable bool) {
@@ -332,12 +426,3 @@ func GetWidth() int {
func GetHeight() int {
return viewportHeight
}
func removeClearBuffer(buffer uint32) {
for i, buffer := range clearBuffer {
if buffer == buffer {
clearBuffer = append(clearBuffer[:i], clearBuffer[i+1:]...)
return
}
}
}

19
loader.go
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@@ -75,6 +75,25 @@ type Ply struct {
IndexBuffer, VertexBuffer, TexCoordBuffer, NormalBuffer *VBO
}
// Drops contained GL buffers.
func (p *Ply) Drop() {
if p.IndexBuffer != nil {
p.IndexBuffer.Drop()
}
if p.VertexBuffer != nil {
p.VertexBuffer.Drop()
}
if p.TexCoordBuffer != nil {
p.TexCoordBuffer.Drop()
}
if p.NormalBuffer != nil {
p.NormalBuffer.Drop()
}
}
// Returns the name of this resource.
func (p *Ply) GetName() string {
return p.name

193
model.go Normal file
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@@ -0,0 +1,193 @@
package goga
import (
"github.com/go-gl/gl/v4.5-core/gl"
)
const (
model_renderer_name = "modelRenderer"
)
// Component representing a 3D mesh.
type Mesh struct {
Index, Vertex, TexCoord *VBO
Vao *VAO
}
// Creates a new mesh with given GL buffers.
// The VAO must be prepared by ModelRenderer.
func NewMesh(index, vertex, texcoord *VBO) *Mesh {
mesh := &Mesh{}
mesh.Index = index
mesh.Vertex = vertex
mesh.TexCoord = texcoord
CheckGLError()
return mesh
}
// Drops the VBOs and VAO contained in mesh.
// This must not be done, if mesh was filled from outer source (like a ply file).
func (m *Mesh) Drop() {
m.Index.Drop()
m.Vertex.Drop()
m.TexCoord.Drop()
m.Vao.Drop()
}
// Model is an actor having a 3D position, a texture and a 3D mesh.
type Model struct {
*Actor
*Pos3D
*Tex
*Mesh
}
// Creates a new model with given mesh and texture.
func NewModel(mesh *Mesh, tex *Tex) *Model {
model := &Model{}
model.Actor = NewActor()
model.Pos3D = NewPos3D()
model.Tex = tex
model.Mesh = mesh
model.Size = Vec3{1, 1, 1}
model.Scale = Vec3{1, 1, 1}
model.Visible = true
CheckGLError()
return model
}
// The model renderer is a system rendering models.
// It has a 3D position component, to move all models at once.
type ModelRenderer struct {
Pos3D
Shader *Shader
Camera *Camera
ortho bool
models []Model
}
// Creates a new model renderer using given shader and camera.
// If shader and/or camera are nil, the default one will be used.
// Orth can be set to true, to use orthogonal projection.
func NewModelRenderer(shader *Shader, camera *Camera, ortho bool) *ModelRenderer {
if shader == nil {
shader = Default3DShader
}
if camera == nil {
camera = DefaultCamera
}
renderer := &ModelRenderer{}
renderer.Shader = shader
renderer.Camera = camera
renderer.ortho = ortho
renderer.models = make([]Model, 0)
renderer.Size = Vec3{1, 1, 1}
renderer.Scale = Vec3{1, 1, 1}
CheckGLError()
return renderer
}
func (s *ModelRenderer) Cleanup() {}
// Prepares a model to be rendered by setting up its VAO.
func (s *ModelRenderer) Prepare(model *Model) {
model.Vao = NewVAO()
model.Vao.Bind()
s.Shader.EnableVertexAttribArrays()
model.Index.Bind()
model.Vertex.Bind()
model.Vertex.AttribPointer(s.Shader.GetAttribLocation(Default_shader_3D_vertex_attrib), 3, gl.FLOAT, false, 0)
model.TexCoord.Bind()
model.TexCoord.AttribPointer(s.Shader.GetAttribLocation(Default_shader_3D_texcoord_attrib), 2, gl.FLOAT, false, 0)
model.Vao.Unbind()
}
// Adds model to the renderer.
// Perpare it first!
func (s *ModelRenderer) Add(actor *Actor, pos *Pos3D, tex *Tex, mesh *Mesh) bool {
id := actor.GetId()
for _, model := range s.models {
if id == model.Actor.GetId() {
return false
}
}
s.models = append(s.models, Model{actor, pos, tex, mesh})
return true
}
// Removes model from renderer.
func (s *ModelRenderer) Remove(actor *Actor) bool {
return s.RemoveById(actor.GetId())
}
// Removes model from renderer by ID.
func (s *ModelRenderer) RemoveById(id ActorId) bool {
for i, model := range s.models {
if model.Actor.GetId() == id {
s.models = append(s.models[:i], s.models[i+1:]...)
return true
}
}
return false
}
// Removes all sprites.
func (s *ModelRenderer) RemoveAll() {
s.models = make([]Model, 0)
}
// Returns number of sprites.
func (s *ModelRenderer) Len() int {
return len(s.models)
}
func (s *ModelRenderer) GetName() string {
return model_renderer_name
}
// Render models.
func (s *ModelRenderer) Update(delta float64) {
s.Shader.Bind()
s.Shader.SendUniform1i(Default_shader_3D_tex, 0)
if s.ortho {
s.Shader.SendMat4(Default_shader_3D_pv, *MultMat4(s.Camera.CalcOrtho3D(), s.CalcModel()))
} else {
pv := s.Camera.CalcProjection()
pv.Mult(s.Camera.CalcView())
s.Shader.SendMat4(Default_shader_3D_pv, *pv)
}
var tid uint32
for i := range s.models {
if !s.models[i].Visible {
continue
}
s.Shader.SendMat4(Default_shader_3D_model, *s.models[i].CalcModel())
s.models[i].Vao.Bind()
// prevent texture switching when not neccessary
if tid != s.models[i].Tex.GetId() {
tid = s.models[i].Tex.GetId()
s.models[i].Tex.Bind()
}
gl.DrawElements(gl.TRIANGLES, s.models[i].Index.Size(), gl.UNSIGNED_INT, nil)
}
}

18
res_util.go
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@@ -21,3 +21,21 @@ func GetTex(name string) (*Tex, error) {
return tex, nil
}
// Finds and returns a Ply resource.
// If not found or when the resource is of wrong type, an error will be returned.
func GetPly(name string) (*Ply, error) {
res := GetResByName(name)
if res == nil {
return nil, errors.New("Resource not found")
}
ply, ok := res.(*Ply)
if !ok {
return nil, errors.New("Resource was not of type *Ply")
}
return ply, nil
}

12
shader/basic2D.fs
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@@ -1,12 +0,0 @@
#version 130
precision highp float;
uniform sampler2D tex;
in vec2 tc;
out vec4 color;
void main(){
color = texture(tex, tc);
}

13
shader/basic2D.vs
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@@ -1,13 +0,0 @@
#version 130
uniform mat3 o, m;
in vec2 vertex;
in vec2 texCoord;
out vec2 tc;
void main(){
tc = texCoord;
gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
}

12
shader/basic3D.fs
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@@ -1,12 +0,0 @@
#version 130
precision highp float;
uniform sampler2D tex;
in vec2 tc;
out vec4 color;
void main(){
color = texture(tex, tc);
}

13
shader/basic3D.vs
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@@ -1,13 +0,0 @@
#version 130
uniform mat4 pv, m;
in vec3 vertex;
in vec2 texCoord;
out vec2 tc;
void main(){
tc = texCoord;
gl_Position = pv*m*vec4(vertex, 1.0);
}

13
shader/text.fs
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@@ -1,13 +0,0 @@
#version 130
precision highp float;
uniform sampler2D tex;
uniform vec4 color;
in vec2 tc;
out vec4 c;
void main(){
c = texture(tex, tc)*color;
}

13
shader/text.vs
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@@ -1,13 +0,0 @@
#version 130
uniform mat3 o, m;
in vec2 vertex;
in vec2 texCoord;
out vec2 tc;
void main(){
tc = texCoord;
gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
}

29
sprite.go
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@@ -15,19 +15,6 @@ type Sprite struct {
*Tex
}
// The sprite renderer is a system rendering sprites.
// It has a 2D position componente, to move all sprites at once.
type SpriteRenderer struct {
Pos2D
Shader *Shader
Camera *Camera
sprites []Sprite
index, vertex, texCoord *VBO
vao *VAO
}
// Creates a new sprite with given texture.
func NewSprite(tex *Tex) *Sprite {
sprite := &Sprite{}
@@ -43,6 +30,19 @@ func NewSprite(tex *Tex) *Sprite {
return sprite
}
// The sprite renderer is a system rendering sprites.
// It has a 2D position component, to move all sprites at once.
type SpriteRenderer struct {
Pos2D
Shader *Shader
Camera *Camera
sprites []Sprite
index, vertex, texCoord *VBO
vao *VAO
}
// Creates a new sprite renderer using given shader and camera.
// If shader and/or camera are nil, the default one will be used.
func NewSpriteRenderer(shader *Shader, camera *Camera, flip bool) *SpriteRenderer {
@@ -132,7 +132,7 @@ func (s *SpriteRenderer) GetName() string {
return sprite_renderer_name
}
// Renders sprites.
// Render sprites.
func (s *SpriteRenderer) Update(delta float64) {
s.Shader.Bind()
s.Shader.SendMat3(Default_shader_2D_ortho, *MultMat3(s.Camera.CalcOrtho(), s.CalcModel()))
@@ -147,6 +147,7 @@ func (s *SpriteRenderer) Update(delta float64) {
s.Shader.SendMat3(Default_shader_2D_model, *s.sprites[i].CalcModel())
// prevent texture switching when not neccessary
if tid != s.sprites[i].Tex.GetId() {
tid = s.sprites[i].Tex.GetId()
s.sprites[i].Tex.Bind()

402
text.go Normal file
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@@ -0,0 +1,402 @@
package goga
/*
import (
"core"
"dp"
"encoding/json"
"geo"
"github.com/go-gl/gl/v4.5-core/gl"
"io/ioutil"
"util"
)
const (
char_padding = 2
)
// Returns a new renderable text object.
func NewText(font *Font, text string) *Text {
t := &Text{id: core.NextId()}
t.text = text
t.index = dp.NewVBO(gl.ELEMENT_ARRAY_BUFFER)
t.vertex = dp.NewVBO(gl.ARRAY_BUFFER)
t.texCoord = dp.NewVBO(gl.ARRAY_BUFFER)
t.vao = dp.NewVAO()
t.SetText(font, text)
t.Size = geo.Vec2{1, 1}
t.Scale = geo.Vec2{1, 1}
t.Visible = true
return t
}
type Character struct {
char byte
min, max, size geo.Vec2
offset float64
}
type Font struct {
Tex *dp.Tex
tileSize float64
CharPadding geo.Vec2
Space, Tab, Line float64
chars []Character
}
type jsonChar struct {
Char string
X, Y, Offset float64
}
// Creates a new font from texture. Characters must be added afterwards.
// The characters must be placed within a grid,
// the second parameter describes the width and height of one tile in pixel.
func NewFont(tex *dp.Tex, tileSize int) *Font {
font := &Font{}
font.Tex = tex
font.tileSize = float64(tileSize)
font.CharPadding = geo.Vec2{0.05, 0.05}
font.Space = 0.3
font.Tab = 1.2
font.Line = 1
font.chars = make([]Character, 0)
return font
}
// Loads characters from JSON file.
// Format:
//
// [
// {
// "char": "a",
// "x": 0,
// "y": 0,
// "offset": 0
// },
// ...
// ]
//
// Where x and y start in the upper left corner of the texture, both of type int.
// Offset is optional and can be used to move a character up or down (relative to others).
// If cut is set to true, the characters will be true typed.
func (f *Font) LoadFromJson(path string, cut bool) error {
// load file content
content, err := ioutil.ReadFile(path)
if err != nil {
return err
}
// read json
chars := make([]jsonChar, 0)
if err = json.Unmarshal(content, &chars); err != nil {
return err
}
f.extractChars(chars, cut)
return nil
}
func (f *Font) extractChars(chars []jsonChar, cut bool) {
for _, char := range chars {
if len(char.Char) != 1 {
continue
}
var min, max, size geo.Vec2
if !cut {
min = geo.Vec2{char.X * f.tileSize, char.Y * f.tileSize}
max = geo.Vec2{min.X + f.tileSize, min.Y + f.tileSize}
size = geo.Vec2{1, 1}
} else {
min, max, size = f.cutChar(int(char.X), int(char.Y))
}
f.chars = append(f.chars, Character{char.Char[0], min, max, size, char.Offset})
}
}
func (f *Font) cutChar(x, y int) (geo.Vec2, geo.Vec2, geo.Vec2) {
minX := int(f.Tex.GetSize().X)
minY := int(f.Tex.GetSize().Y)
maxX := 0
maxY := 0
rgba := f.Tex.GetRGBA()
for ry := y * int(f.tileSize); ry < (y+1)*int(f.tileSize); ry++ {
for rx := x * int(f.tileSize); rx < (x+1)*int(f.tileSize); rx++ {
_, _, _, a := rgba.At(rx, ry).RGBA()
if a == 0 {
continue
}
if rx < minX {
minX = rx
} else if rx > maxX {
maxX = rx
}
if ry < minY {
minY = ry
} else if ry > maxY {
maxY = ry
}
}
}
minX -= char_padding
maxX += char_padding
minY -= char_padding
maxY += char_padding
texSize := f.Tex.GetSize()
min := geo.Vec2{float64(minX) / texSize.X, float64(maxY) / texSize.Y}
max := geo.Vec2{float64(maxX) / texSize.X, float64(minY) / texSize.Y}
// size
size := geo.Vec2{float64(maxX-minX) / f.tileSize, float64(maxY-minY) / f.tileSize}
return min, max, size
}
func (f *Font) getChar(char byte) *Character {
for _, character := range f.chars {
if character.char == char {
return &character
}
}
return nil
}
type Text struct {
*Actor
*Pos2D
id int
text string
bounds geo.Vec2
index, vertex, texCoord *dp.VBO
vao *dp.VAO
}
// Deletes GL buffers bound to this text.
func (t *Text) Drop() {
t.index.Drop()
t.vertex.Drop()
t.texCoord.Drop()
t.vao.Drop()
}
// Sets the given string as text and (re)creates buffers.
func (t *Text) SetText(font *Font, text string) {
t.text = text
indices := make([]uint32, len(text)*6)
vertices := make([]float32, len(text)*8)
texCoords := make([]float32, len(text)*8)
chars := 0
// create indices
var index uint32 = 0
for i := 0; i < len(text)*6; i += 6 {
indices[i] = index
indices[i+1] = index + 1
indices[i+2] = index + 2
indices[i+3] = index + 1
indices[i+4] = index + 2
indices[i+5] = index + 3
index += 4
}
// create vertices/texCoords
index = 0
offset := geo.Vec2{}
var width, height float64
for i := 0; i < len(text)*8 && int(index) < len(text); i += 8 {
c := font.getChar(text[index])
index++
// whitespace and new line
if text[index-1] == ' ' {
offset.X += font.Space
i -= 8
continue
}
if text[index-1] == '\n' {
offset.X = 0
offset.Y -= font.Line
i -= 8
continue
}
if text[index-1] == '\t' {
offset.X += font.Tab
i -= 8
continue
}
// character not found
if c == nil {
i -= 8
continue
}
// usual character
vertices[i] = float32(offset.X)
vertices[i+1] = float32(offset.Y + c.offset)
vertices[i+2] = float32(offset.X + c.size.X)
vertices[i+3] = float32(offset.Y + c.offset)
vertices[i+4] = float32(offset.X)
vertices[i+5] = float32(offset.Y + c.size.Y + c.offset)
vertices[i+6] = float32(offset.X + c.size.X)
vertices[i+7] = float32(offset.Y + c.size.Y + c.offset)
texCoords[i] = float32(c.min.X)
texCoords[i+1] = float32(c.min.Y)
texCoords[i+2] = float32(c.max.X)
texCoords[i+3] = float32(c.min.Y)
texCoords[i+4] = float32(c.min.X)
texCoords[i+5] = float32(c.max.Y)
texCoords[i+6] = float32(c.max.X)
texCoords[i+7] = float32(c.max.Y)
offset.X += c.size.X + font.CharPadding.X
chars++
if offset.X > width {
width = offset.X
}
if offset.Y*-1+font.Line > height {
height = offset.Y*-1 + font.Line
}
}
t.bounds = geo.Vec2{width, height}
// fill GL buffer
t.index.Fill(gl.Ptr(indices[:chars*6]), 4, chars*6, gl.STATIC_DRAW)
t.vertex.Fill(gl.Ptr(vertices[:chars*8]), 4, chars*8, gl.STATIC_DRAW)
t.texCoord.Fill(gl.Ptr(texCoords[:chars*8]), 4, chars*8, gl.STATIC_DRAW)
util.CheckGLError()
}
func (t *Text) GetId() int {
return t.id
}
// Returns the text as string.
func (t *Text) GetText() string {
return t.text
}
// Returns bounds of text, which is the size of characters.
func (t *Text) GetBounds() geo.Vec2 {
return geo.Vec2{t.bounds.X * t.Size.X * t.Scale.X, t.bounds.Y * t.Size.Y * t.Scale.Y}
}
type TextRenderer struct {
Pos2D
Shader *dp.Shader
Camera *Camera
Font *Font
Color geo.Vec4
texts []*Text
}
// Creates a new text renderer using given shader, camera and font.
// If shader and/or camera are nil, the default one will be used.
func NewTextRenderer(shader *dp.Shader, camera *Camera, font *Font) *TextRenderer {
renderer := &TextRenderer{}
renderer.Shader = shader
renderer.Camera = camera
renderer.Font = font
renderer.Color = geo.Vec4{1, 1, 1, 1}
renderer.texts = make([]*Text, 0)
renderer.Size = geo.Vec2{1, 1}
renderer.Scale = geo.Vec2{1, 1}
return renderer
}
// Prepares a text for rendering.
func (r *TextRenderer) Prepare(text *Text) {
text.vao = dp.NewVAO()
text.vao.Bind()
r.Shader.EnableVertexAttribArrays()
text.index.Bind()
text.vertex.Bind()
text.vertex.AttribPointer(r.Shader.GetAttribLocation(TEXTRENDERER_VERTEX_ATTRIB), 2, gl.FLOAT, false, 0)
text.texCoord.Bind()
text.texCoord.AttribPointer(r.Shader.GetAttribLocation(TEXTRENDERER_TEXCOORD_ATTRIB), 2, gl.FLOAT, false, 0)
text.vao.Unbind()
}
// Adds text to the renderer.
func (r *TextRenderer) Add(text *Text) {
r.texts = append(r.texts, text)
}
// Returns text by ID.
func (r *TextRenderer) Get(id int) *Text {
for _, text := range r.texts {
if text.GetId() == id {
return text
}
}
return nil
}
// Removes text from renderer by ID.
func (r *TextRenderer) Remove(id int) *Text {
for i, text := range r.texts {
if text.GetId() == id {
r.texts = append(r.texts[:i], r.texts[i+1:]...)
return text
}
}
return nil
}
// Removes all sprites.
func (r *TextRenderer) Clear() {
r.texts = make([]*Text, 0)
}
// Renders sprites.
func (r *TextRenderer) Render() {
r.Shader.Bind()
r.Shader.SendMat3(TEXTRENDERER_ORTHO, *geo.MultMat3(r.Camera.CalcOrtho(), r.CalcModel()))
r.Shader.SendUniform1i(TEXTRENDERER_TEX, 0)
r.Shader.SendUniform4f(TEXTRENDERER_COLOR, float32(r.Color.X), float32(r.Color.Y), float32(r.Color.Z), float32(r.Color.W))
r.Font.Tex.Bind()
for i := range r.texts {
if !r.texts[i].Visible {
continue
}
r.texts[i].vao.Bind()
r.Shader.SendMat3(TEXTRENDERER_MODEL, *r.texts[i].CalcModel())
gl.DrawElements(gl.TRIANGLES, r.texts[i].index.Size(), gl.UNSIGNED_INT, nil)
}
}
*/