Method Setup

common/render_shaders_text.go:35–115

(w *ecs.World)

}

func (l *textShader) Setup(w *ecs.World) error {
	var err error
	l.program, err = LoadShader(`
attribute vec2 in_Position;
attribute vec2 in_TexCoords;
attribute vec4 in_Color;

uniform mat3 matrixProjection;
uniform mat3 matrixView;
uniform mat3 matrixModel;

varying vec4 var_Color;
varying vec2 var_TexCoords;

void main() {
  var_Color = in_Color;
  var_TexCoords = in_TexCoords;

  vec3 matr = matrixProjection * matrixView * matrixModel * vec3(in_Position, 1.0);
  gl_Position = vec4(matr.xy, 0, matr.z);
}
`, `
#ifdef GL_ES
#define LOWP lowp
precision mediump float;
#else
#define LOWP
#endif

varying vec4 var_Color;
varying vec2 var_TexCoords;

uniform sampler2D uf_Texture;

void main (void) {
  gl_FragColor = var_Color * texture2D(uf_Texture, var_TexCoords);
}`)

	if err != nil {
		return err
	}

	// Create and populate indices buffer
	l.indicesRectangles = make([]uint16, 6*bufferSize)
	for i, j := 0, 0; i < bufferSize*6; i, j = i+6, j+4 {
		l.indicesRectangles[i+0] = uint16(j + 0)
		l.indicesRectangles[i+1] = uint16(j + 1)
		l.indicesRectangles[i+2] = uint16(j + 2)
		l.indicesRectangles[i+3] = uint16(j + 0)
		l.indicesRectangles[i+4] = uint16(j + 2)
		l.indicesRectangles[i+5] = uint16(j + 3)
	}
	l.indicesRectanglesVBO = engo.Gl.CreateBuffer()
	engo.Gl.BindBuffer(engo.Gl.ELEMENT_ARRAY_BUFFER, l.indicesRectanglesVBO)
	engo.Gl.BufferData(engo.Gl.ELEMENT_ARRAY_BUFFER, l.indicesRectangles, engo.Gl.STATIC_DRAW)

	// Define things that should be read from the texture buffer
	l.inPosition = engo.Gl.GetAttribLocation(l.program, "in_Position")