Font shader;

src/graphics/graphics.c

@@ -79,6 +79,7 @@ void lovrGraphicsInit() {
   state.skyboxShader = lovrShaderCreate(lovrSkyboxVertexShader, lovrSkyboxFragmentShader);
   int uniformId = lovrShaderGetUniformId(state.skyboxShader, "cube");
   lovrShaderSendInt(state.skyboxShader, uniformId, 1);
+  state.fontShader = lovrShaderCreate(lovrDefaultVertexShader, lovrFontFragmentShader);
   state.fullscreenShader = lovrShaderCreate(lovrNoopVertexShader, lovrDefaultFragmentShader);
   state.defaultTexture = lovrTextureCreate(lovrTextureDataGetBlank(1, 1, 0xff, FORMAT_RGBA));
 
@@ -1029,6 +1030,17 @@ void lovrGraphicsSkybox(Skybox* skybox, float angle, float ax, float ay, float a
 }
 
 void lovrGraphicsPrint(const char* str, mat4 transform, float wrap, HorizontalAlign halign, VerticalAlign valign) {
+  Shader* lastShader = lovrGraphicsGetShader();
+  if (lastShader == state.defaultShader) {
+    lovrRetain(&lastShader->ref);
+    lovrGraphicsSetShader(state.fontShader);
+  }
+
   lovrGraphicsEnsureFont();
   lovrFontPrint(state.activeFont, str, transform, wrap, halign, valign);
+
+  if (lastShader == state.defaultShader) {
+    lovrGraphicsSetShader(lastShader);
+    lovrRelease(&lastShader->ref);
+  }
 }

src/graphics/graphics.h

@@ -73,6 +73,7 @@ typedef struct {
   Shader* activeShader;
   Shader* defaultShader;
   Shader* skyboxShader;
+  Shader* fontShader;
   Shader* fullscreenShader;
   Font* activeFont;
   Font* defaultFont;

src/graphics/shader.c

@@ -74,6 +74,19 @@ const char* lovrSkyboxFragmentShader = ""
 "}"
 "";
 
+const char* lovrFontFragmentShader = ""
+"float median(float r, float g, float b) { \n"
+"  return max(min(r, g), min(max(r, g), b)); \n"
+"} \n"
+"vec4 color(vec4 graphicsColor, sampler2D image, vec2 uv) { \n"
+"  vec3 sample = texture(image, uv).rgb; \n"
+"  float sdf = median(sample.r, sample.g, sample.b); \n"
+"  float w = fwidth(sdf); \n"
+"  float alpha = smoothstep(.5 - w, .5 + w, sdf); \n"
+"  return vec4(graphicsColor.rgb, alpha); \n"
+"}"
+"";
+
 const char* lovrNoopVertexShader = ""
 "vec4 position(mat4 projection, mat4 transform, vec4 vertex) { \n"
 "  return vertex; \n"

src/graphics/shader.h

@@ -36,6 +36,7 @@ extern const char* lovrDefaultVertexShader;
 extern const char* lovrDefaultFragmentShader;
 extern const char* lovrSkyboxVertexShader;
 extern const char* lovrSkyboxFragmentShader;
+extern const char* lovrFontFragmentShader;
 extern const char* lovrNoopVertexShader;
 
 GLuint compileShader(GLuint type, const char* source);