我一直在尝试使用距离场字体,就像这篇文章所描述的那样:https://github.com/libgdx/libgdx/wiki/Distance-field-fonts
当我只渲染字体时,一切都正常,但是当我尝试在上使用着色器时,按钮变成了白色,因为它将着色器应用于整个按钮而不仅仅是文本。我已经查找过了,但是我找不到有关如何仅更改的文本着色器的任何信息,所以我在这里问:如何仅将自定义着色器应用于的文本呈现?
初始化代码:
初始化代码:
textShader = new ShaderProgram(Gdx.files.internal("graphics/shaders/font/font.vert"),
Gdx.files.internal("graphics/shaders/font/font.frag"));
//exact same shaders as linked article
stage = new Stage();
stage.getBatch().setShader(textShader);
//Setting the shader for the stage will set the shader for everything in the stage,
//like my labels/buttons etc. This works fine for my labels as they are plain text,
//but my buttons become completely white.
init the rest of my labels, buttons, batches etc...
渲染代码:
Gdx.gl.glClearColor(0, 0, 0, 1);
Gdx.gl.glClear(GL_COLOR_BUFFER_BIT);
render background/other stuff...
stage.act(delta);
stage.draw();
片段着色器:
#ifdef GL_ES
precision mediump float;
#endif
uniform sampler2D u_texture;
varying vec4 v_color;
varying vec2 v_texCoord;
const float c_width = 0.5;
const float c_edge = 0.1;
const vec2 c_offset = vec2(0);
const float c_borderWidth = 0.5;
const float c_borderEdge = 0.5;
const vec3 c_color = vec3(0.7, 0.3, 0.1);
const vec3 c_outlineColor = vec3(0.3);
void main() {
float distance = 1.0 - texture(u_texture, v_texCoord).a;
float alpha = 1.0 - smoothstep(c_width, c_width + c_edge, distance);
float distance2 = 1.0 - texture(u_texture, v_texCoord + c_offset).a;
float outlineAlpha = 1.0 - smoothstep(c_borderWidth, c_borderWidth + c_borderEdge, distance2);
float overallAlpha = alpha + (1.0 - alpha) * outlineAlpha;
vec3 overallColour = mix(c_outlineColor, c_color, alpha/overallAlpha);
gl_FragColor = vec4(overallColour, overallAlpha);
}
顶点着色器:
uniform mat4 u_projTrans;
attribute vec4 a_position;
attribute vec2 a_texCoord0;
attribute vec4 a_color;
varying vec4 v_color;
varying vec2 v_texCoord;
void main() {
gl_Position = u_projTrans * a_position;
v_texCoord = a_texCoord0;
v_color = a_color;
}