mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-21 05:42:18 +02:00
84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
package shader
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import (
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"github.com/go-gl/gl"
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"github.com/hajimehoshi/ebiten/graphics/matrix"
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"sync"
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)
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func glMatrix(matrix [4][4]float64) [16]float32 {
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result := [16]float32{}
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for j := 0; j < 4; j++ {
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for i := 0; i < 4; i++ {
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result[i+j*4] = float32(matrix[i][j])
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}
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}
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return result
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}
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var once sync.Once
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func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []TextureQuad, geo matrix.Geometry, color matrix.Color) {
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once.Do(func() {
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initialize()
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})
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if len(quads) == 0 {
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return
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}
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// TODO: Check performance
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shaderProgram := use(glMatrix(projectionMatrix), geo, color)
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native.Bind(gl.TEXTURE_2D)
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defer gl.Texture(0).Bind(gl.TEXTURE_2D)
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vertexAttrLocation := getAttributeLocation(shaderProgram, "vertex")
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texCoordAttrLocation := getAttributeLocation(shaderProgram, "tex_coord")
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gl.EnableClientState(gl.VERTEX_ARRAY)
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gl.EnableClientState(gl.TEXTURE_COORD_ARRAY)
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vertexAttrLocation.EnableArray()
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texCoordAttrLocation.EnableArray()
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defer func() {
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texCoordAttrLocation.DisableArray()
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vertexAttrLocation.DisableArray()
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gl.DisableClientState(gl.TEXTURE_COORD_ARRAY)
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gl.DisableClientState(gl.VERTEX_ARRAY)
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}()
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vertices := []float32{}
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texCoords := []float32{}
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indicies := []uint32{}
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// TODO: Check len(parts) and GL_MAX_ELEMENTS_INDICES
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for i, quad := range quads {
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x1 := quad.VertexX1
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x2 := quad.VertexX2
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y1 := quad.VertexY1
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y2 := quad.VertexY2
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vertices = append(vertices,
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x1, y1,
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x2, y1,
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x1, y2,
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x2, y2,
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)
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u1 := quad.TextureCoordU1
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u2 := quad.TextureCoordU2
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v1 := quad.TextureCoordV1
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v2 := quad.TextureCoordV2
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texCoords = append(texCoords,
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u1, v1,
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u2, v1,
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u1, v2,
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u2, v2,
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)
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base := uint32(i * 4)
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indicies = append(indicies,
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base, base+1, base+2,
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base+1, base+2, base+3,
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)
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}
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vertexAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, vertices)
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texCoordAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, texCoords)
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gl.DrawElements(gl.TRIANGLES, len(indicies), gl.UNSIGNED_INT, indicies)
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}
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