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"
"github.com/hajimehoshi/ebiten/internal/graphics/internal/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
}
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var vertices = make([]int16, 0, 4*8*quadsMaxNum)
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var shadersInitialized = false
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func drawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix *[4][4]float64, quads TextureQuads, geo Matrix, color Matrix) error {
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// TODO: 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 {
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if err := initialize(c); err != nil {
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return err
}
shadersInitialized = true
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}
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if quads.Len() == 0 {
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return nil
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}
if quadsMaxNum < quads.Len() {
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return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", quadsMaxNum))
}
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f := useProgramForTexture(c, glMatrix(projectionMatrix), texture, geo, color)
defer f.FinishProgram()
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vertices := vertices[0:0]
num := 0
for i := 0; i < quads.Len(); i++ {
x0, y0, x1, y1 := quads.Vertex(i)
u0, v0, u1, v1 := quads.Texture(i)
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if x0 == x1 || y0 == y1 || u0 == u1 || v0 == v1 {
continue
}
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vertices = append(vertices,
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int16(x0), int16(y0), int16(u0), int16(v0),
int16(x1), int16(y0), int16(u1), int16(v0),
int16(x0), int16(y1), int16(u0), int16(v1),
int16(x1), int16(y1), int16(u1), int16(v1),
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)
num++
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}
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if len(vertices) == 0 {
return nil
}
c.BufferSubData(c.ArrayBuffer, vertices)
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c.DrawElements(c.Triangles, 6*num)
return nil
}
func drawLines(c *opengl.Context, projectionMatrix *[4][4]float64, lines Lines) error {
if !shadersInitialized {
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if err := initialize(c); err != nil {
return err
}
shadersInitialized = true
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}
if lines.Len() == 0 {
return nil
}
f := useProgramForLines(c, glMatrix(projectionMatrix))
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defer f.FinishProgram()
vertices := vertices[0:0]
num := 0
for i := 0; i < lines.Len(); i++ {
x0, y0, x1, y1 := lines.Points(i)
if x0 == x1 && y0 == y1 {
continue
}
r, g, b, a := lines.Color(i).RGBA()
vertices = append(vertices,
int16(x0), int16(y0), int16(r), int16(g), int16(b), int16(a),
int16(x1), int16(y1), int16(r), int16(g), int16(b), int16(a),
)
num++
}
if len(vertices) == 0 {
return nil
}
c.BufferSubData(c.ArrayBuffer, vertices)
c.DrawElements(c.Lines, 2*num)
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return nil
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}
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func drawFilledRects(c *opengl.Context, projectionMatrix *[4][4]float64, rects Rects) error {
if !shadersInitialized {
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if err := initialize(c); err != nil {
return err
}
shadersInitialized = true
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}
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if rects.Len() == 0 {
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return nil
}
f := useProgramForRects(c, glMatrix(projectionMatrix))
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defer f.FinishProgram()
vertices := vertices[0:0]
num := 0
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for i := 0; i < rects.Len(); i++ {
x, y, w, h := rects.Rect(i)
if w == 0 || h == 0 {
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continue
}
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x0, y0, x1, y1 := x, y, x+w, y+h
r, g, b, a := rects.Color(i).RGBA()
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vertices = append(vertices,
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int16(x0), int16(y0), int16(r), int16(g), int16(b), int16(a),
int16(x1), int16(y0), int16(r), int16(g), int16(b), int16(a),
int16(x0), int16(y1), int16(r), int16(g), int16(b), int16(a),
int16(x1), int16(y1), int16(r), int16(g), int16(b), int16(a),
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)
num++
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}
if len(vertices) == 0 {
return nil
}
c.BufferSubData(c.ArrayBuffer, vertices)
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c.DrawElements(c.Triangles, 6*num)
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return nil
}