mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
68 lines
2.1 KiB
Go
68 lines
2.1 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package graphics
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import (
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"errors"
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"fmt"
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"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
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)
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func glMatrix(m *[4][4]float64) []float32 {
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return []float32{
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float32(m[0][0]), float32(m[1][0]), float32(m[2][0]), float32(m[3][0]),
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float32(m[0][1]), float32(m[1][1]), float32(m[2][1]), float32(m[3][1]),
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float32(m[0][2]), float32(m[1][2]), float32(m[2][2]), float32(m[3][2]),
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float32(m[0][3]), float32(m[1][3]), float32(m[2][3]), float32(m[3][3]),
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}
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}
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type Matrix interface {
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Element(i, j int) float64
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}
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func drawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix *[4][4]float64, vertices []int16, geo Matrix, color Matrix, mode opengl.CompositeMode) error {
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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.
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// Let's use them to compare to len(quads) in the future.
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n := len(vertices) / 16
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if n == 0 {
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return nil
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}
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if MaxQuads < n/16 {
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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{
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state: &theOpenGLState,
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program: theOpenGLState.programTexture,
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context: c,
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projectionMatrix: glMatrix(projectionMatrix),
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texture: texture,
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geoM: geo,
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colorM: color,
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}
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p.begin()
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defer p.end()
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// TODO: We should call glBindBuffer here?
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// The buffer is already bound at begin() but it is counterintuitive.
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c.BufferSubData(c.ArrayBuffer, vertices)
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c.DrawElements(c.Triangles, 6*n)
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return nil
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}
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