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Optimize rendering textures

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This commit is contained in:
Hajime Hoshi 2013-10-26 00:01:12 +09:00
parent b15febed51
commit ac572a5554
1 changed files with 25 additions and 14 deletions
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39
graphics/opengl/context.go
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@ -104,6 +104,9 @@ func (context *Context) DrawTextureParts(
if !ok {
panic("invalid texture ID")
}
if len(parts) == 0 {
return
}
shaderProgram := context.setShaderProgram(geometryMatrix, colorMatrix)
C.glBindTexture(C.GL_TEXTURE_2D, texture.Native().(C.GLuint))
@ -115,38 +118,46 @@ func (context *Context) DrawTextureParts(
C.glEnableClientState(C.GL_TEXTURE_COORD_ARRAY)
C.glEnableVertexAttribArray(C.GLuint(vertexAttrLocation))
C.glEnableVertexAttribArray(C.GLuint(textureAttrLocation))
// TODO: Optimization
for _, part := range parts {
vertices := []float32{}
texCoords := []float32{}
indicies := []uint32{}
// TODO: Check len(parts) and GL_MAX_ELEMENTS_INDICES
for i, part := range parts {
x1 := float32(part.LocationX)
x2 := float32(part.LocationX + part.Source.Width)
y1 := float32(part.LocationY)
y2 := float32(part.LocationY + part.Source.Height)
vertex := [...]float32{
vertices = append(vertices,
x1, y1,
x2, y1,
x1, y2,
x2, y2,
}
)
src := part.Source
tu1 := float32(texture.U(src.X))
tu2 := float32(texture.U(src.X + src.Width))
tv1 := float32(texture.V(src.Y))
tv2 := float32(texture.V(src.Y + src.Height))
texCoord := [...]float32{
texCoords = append(texCoords,
tu1, tv1,
tu2, tv1,
tu1, tv2,
tu2, tv2,
}
C.glVertexAttribPointer(C.GLuint(vertexAttrLocation), 2,
C.GL_FLOAT, C.GL_FALSE,
0, unsafe.Pointer(&vertex[0]))
C.glVertexAttribPointer(C.GLuint(textureAttrLocation), 2,
C.GL_FLOAT, C.GL_FALSE,
0, unsafe.Pointer(&texCoord[0]))
C.glDrawArrays(C.GL_TRIANGLE_STRIP, 0, 4)
)
base := uint32(i*4)
indicies = append(indicies,
base, base+1, base+2,
base+1, base+2, base+3,
)
}
C.glVertexAttribPointer(C.GLuint(vertexAttrLocation), 2,
C.GL_FLOAT, C.GL_FALSE,
0, unsafe.Pointer(&vertices[0]))
C.glVertexAttribPointer(C.GLuint(textureAttrLocation), 2,
C.GL_FLOAT, C.GL_FALSE,
0, unsafe.Pointer(&texCoords[0]))
C.glDrawElements(C.GL_TRIANGLES, C.GLsizei(len(indicies)),
C.GL_UNSIGNED_INT, unsafe.Pointer(&indicies[0]))
C.glDisableVertexAttribArray(C.GLuint(textureAttrLocation))
C.glDisableVertexAttribArray(C.GLuint(vertexAttrLocation))
C.glDisableClientState(C.GL_TEXTURE_COORD_ARRAY)