ebiten/internal/graphics/draw.go

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// 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.
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package graphics
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import (
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"errors"
"fmt"
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"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
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)
func glMatrix(m *[4][4]float64) []float32 {
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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]),
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}
}
type Matrix interface {
Element(i, j int) float64
}
func drawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix *[4][4]float64, vertices []int16, geo Matrix, color Matrix, mode opengl.CompositeMode) error {
c.BlendFunc(mode)
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// 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.
n := len(vertices) / 16
if n == 0 {
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return nil
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}
if MaxQuads < n/16 {
return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", MaxQuads))
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}
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p := programContext{
state: &theOpenGLState,
program: theOpenGLState.programTexture,
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context: c,
projectionMatrix: glMatrix(projectionMatrix),
texture: texture,
geoM: geo,
colorM: color,
}
p.begin()
defer p.end()
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c.BufferSubData(c.ArrayBuffer, vertices)
c.DrawElements(c.Triangles, 6*n)
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return nil
}