mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
131 lines
3.2 KiB
Go
131 lines
3.2 KiB
Go
// Copyright 2014 Hajime Hoshi
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package graphics
|
|
|
|
import (
|
|
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
|
|
"image/color"
|
|
"math"
|
|
)
|
|
|
|
type TextureQuads interface {
|
|
Len() int
|
|
SetVertices(vertices []int16) int
|
|
}
|
|
|
|
func orthoProjectionMatrix(left, right, bottom, top int) *[4][4]float64 {
|
|
e11 := float64(2) / float64(right-left)
|
|
e22 := float64(2) / float64(top-bottom)
|
|
e14 := -1 * float64(right+left) / float64(right-left)
|
|
e24 := -1 * float64(top+bottom) / float64(top-bottom)
|
|
|
|
return &[4][4]float64{
|
|
{e11, 0, 0, e14},
|
|
{0, e22, 0, e24},
|
|
{0, 0, 1, 0},
|
|
{0, 0, 0, 1},
|
|
}
|
|
}
|
|
|
|
type Framebuffer struct {
|
|
native opengl.Framebuffer
|
|
width int
|
|
height int
|
|
flipY bool
|
|
proMatrix *[4][4]float64
|
|
}
|
|
|
|
func NewZeroFramebuffer(c *opengl.Context, width, height int) (*Framebuffer, error) {
|
|
r := &Framebuffer{
|
|
width: width,
|
|
height: height,
|
|
flipY: true,
|
|
}
|
|
return r, nil
|
|
}
|
|
|
|
func NewFramebufferFromTexture(c *opengl.Context, texture *Texture) (*Framebuffer, error) {
|
|
f, err := c.NewFramebuffer(opengl.Texture(texture.native))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
w, h := texture.Size()
|
|
return &Framebuffer{
|
|
native: f,
|
|
width: w,
|
|
height: h,
|
|
}, nil
|
|
}
|
|
|
|
func (f *Framebuffer) Size() (width, height int) {
|
|
return f.width, f.height
|
|
}
|
|
|
|
func (f *Framebuffer) Dispose(c *opengl.Context) {
|
|
// Don't delete the default framebuffer.
|
|
if f.native == opengl.ZeroFramebuffer {
|
|
return
|
|
}
|
|
c.DeleteFramebuffer(f.native)
|
|
}
|
|
|
|
func (f *Framebuffer) setAsViewport(c *opengl.Context) error {
|
|
width := NextPowerOf2Int(f.width)
|
|
height := NextPowerOf2Int(f.height)
|
|
return c.SetViewport(f.native, width, height)
|
|
}
|
|
|
|
func (f *Framebuffer) projectionMatrix() *[4][4]float64 {
|
|
if f.proMatrix != nil {
|
|
return f.proMatrix
|
|
}
|
|
width := NextPowerOf2Int(f.width)
|
|
height := NextPowerOf2Int(f.height)
|
|
m := orthoProjectionMatrix(0, width, 0, height)
|
|
if f.flipY {
|
|
m[1][1] *= -1
|
|
m[1][3] += float64(f.height) / float64(NextPowerOf2Int(f.height)) * 2
|
|
}
|
|
f.proMatrix = m
|
|
return f.proMatrix
|
|
}
|
|
|
|
func (f *Framebuffer) Fill(c *opengl.Context, clr color.Color) error {
|
|
if err := f.setAsViewport(c); err != nil {
|
|
return err
|
|
}
|
|
cr, cg, cb, ca := clr.RGBA()
|
|
const max = math.MaxUint16
|
|
r := float64(cr) / max
|
|
g := float64(cg) / max
|
|
b := float64(cb) / max
|
|
a := float64(ca) / max
|
|
return c.FillFramebuffer(r, g, b, a)
|
|
}
|
|
|
|
func (f *Framebuffer) DrawTexture(c *opengl.Context, t *Texture, quads TextureQuads, geo, clr Matrix) error {
|
|
if err := f.setAsViewport(c); err != nil {
|
|
return err
|
|
}
|
|
p := f.projectionMatrix()
|
|
return drawTexture(c, t.native, p, quads, geo, clr)
|
|
}
|
|
|
|
func (f *Framebuffer) Pixels(c *opengl.Context) ([]uint8, error) {
|
|
w, h := f.Size()
|
|
w, h = NextPowerOf2Int(w), NextPowerOf2Int(h)
|
|
return c.FramebufferPixels(f.native, w, h)
|
|
}
|