添加 文本渲染

Editor/assets/shaders/Renderer2D_text.glsl

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+// Basic MSDF Text Texture Shader
+
+#type vertex
+#version 450 core
+
+layout(location = 0) in vec3 a_Position;
+layout(location = 1) in vec4 a_Color;
+layout(location = 2) in vec2 a_TexCoord;
+layout(location = 3) in int a_EntityID;
+
+layout(std140, binding = 0) uniform Camera
+{
+	mat4 u_ViewProjection;
+};
+
+layout (location = 0) out vec4 o_Color;
+layout (location = 1) out vec2 o_TexCoord;
+layout (location = 2) out flat int v_EntityID;
+
+void main()
+{
+	o_Color = a_Color;
+	o_TexCoord = a_TexCoord;
+	v_EntityID = a_EntityID;
+
+	gl_Position = u_ViewProjection * vec4(a_Position, 1.0);
+}
+
+#type fragment
+#version 450 core
+
+layout(location = 0) out vec4 o_Color;
+layout(location = 1) out int o_EntityID;
+
+layout (location = 0) in vec4 i_Color;
+layout (location = 1) in vec2 i_TexCoord;
+layout (location = 2) in flat int v_EntityID;
+
+layout (binding = 0) uniform sampler2D u_FontAtlas;
+
+float screenPxRange() {
+	const float pxRange = 2.0; // set to distance field's pixel range
+    vec2 unitRange = vec2(pxRange)/vec2(textureSize(u_FontAtlas, 0));
+    vec2 screenTexSize = vec2(1.0)/fwidth(i_TexCoord); // 使用 i_TexCoord
+    return max(0.5*dot(unitRange, screenTexSize), 1.0);
+}
+
+float median(float r, float g, float b) {
+    return max(min(r, g), min(max(r, g), b));
+}
+
+void main()
+{
+	vec4 texColor = i_Color * texture(u_FontAtlas, i_TexCoord); // 使用 i_Color 和 i_TexCoord
+
+	vec3 msd = texture(u_FontAtlas, i_TexCoord).rgb; // 使用 i_TexCoord
+    float sd = median(msd.r, msd.g, msd.b);
+    float screenPxDistance = screenPxRange()*(sd - 0.5);
+    float opacity = clamp(screenPxDistance + 0.5, 0.0, 1.0);
+	if (opacity == 0.0)
+		discard;
+
+	vec4 bgColor = vec4(0.0);
+    o_Color = mix(bgColor, i_Color, opacity); // 使用 i_Color
+	if (o_Color.a == 0.0)
+		discard;
+
+	o_EntityID = v_EntityID;
+}