mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
75 lines
2.2 KiB
Go
75 lines
2.2 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 (
|
|
"errors"
|
|
"fmt"
|
|
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
|
|
)
|
|
|
|
func glMatrix(m *[4][4]float64) []float32 {
|
|
return []float32{
|
|
float32(m[0][0]), float32(m[1][0]), float32(m[2][0]), float32(m[3][0]),
|
|
float32(m[0][1]), float32(m[1][1]), float32(m[2][1]), float32(m[3][1]),
|
|
float32(m[0][2]), float32(m[1][2]), float32(m[2][2]), float32(m[3][2]),
|
|
float32(m[0][3]), float32(m[1][3]), float32(m[2][3]), float32(m[3][3]),
|
|
}
|
|
}
|
|
|
|
type Matrix interface {
|
|
Element(i, j int) float64
|
|
}
|
|
|
|
var vertices = make([]int16, 16*quadsMaxNum)
|
|
|
|
var shadersInitialized = false
|
|
|
|
func drawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix *[4][4]float64, quads TextureQuads, geo Matrix, color Matrix) error {
|
|
// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
|
|
// Let's use them to compare to len(quads) in the future.
|
|
|
|
if !shadersInitialized {
|
|
if err := initialize(c); err != nil {
|
|
return err
|
|
}
|
|
shadersInitialized = true
|
|
}
|
|
|
|
if quads.Len() == 0 {
|
|
return nil
|
|
}
|
|
if quadsMaxNum < quads.Len() {
|
|
return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", quadsMaxNum))
|
|
}
|
|
|
|
p := programContext{
|
|
program: programTexture,
|
|
context: c,
|
|
projectionMatrix: glMatrix(projectionMatrix),
|
|
texture: texture,
|
|
geoM: geo,
|
|
colorM: color,
|
|
}
|
|
p.begin()
|
|
defer p.end()
|
|
if err := quads.SetVertices(vertices); err != nil {
|
|
return err
|
|
}
|
|
c.BufferSubData(c.ArrayBuffer, vertices[:16*quads.Len()])
|
|
c.DrawElements(c.Triangles, 6*quads.Len())
|
|
return nil
|
|
}
|