animated font shader

include/render.hpp

@@ -31,6 +31,8 @@ extern "C" {
                    uint uniform_trans,
                    uint uniform_texture_trans,
                    uint uniform_texture0,
+                   uint uniform_base_color,
+                   uint uniform_time,
                    struct game_state * state);
 
   void render_background(struct mesh plane_mesh,

src/main.c

@@ -160,6 +160,8 @@ int main()
   uint font__uniform_trans = glGetUniformLocation(font_program, "trans");
   uint font__uniform_texture_trans = glGetUniformLocation(font_program, "texture_trans");
   uint font__uniform_texture0 = glGetUniformLocation(font_program, "texture0");
+  uint font__uniform_base_color = glGetUniformLocation(font_program, "base_color");
+  uint font__uniform_time = glGetUniformLocation(font_program, "time");
   printf("attrib_t %d\n", font__attrib_texture);
 
   // background
@@ -325,7 +327,8 @@ int main()
                   paddle__uniform_time,
                   &state);
 
-    glDisable(GL_BLEND);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glDepthFunc(GL_ALWAYS);
     glUseProgram(font_program);
     render_font(plane_mesh,
@@ -334,6 +337,8 @@ int main()
                 font__uniform_trans,
                 font__uniform_texture_trans,
                 font__uniform_texture0,
+                font__uniform_base_color,
+                font__uniform_time,
                 &state);
 
     glfwSwapBuffers(window);

src/render.cpp

@@ -271,6 +271,8 @@ void render_font(struct mesh plane_mesh,
                  uint uniform_trans,
                  uint uniform_texture_trans,
                  uint uniform_texture0,
+                 uint uniform_base_color,
+                 uint uniform_time,
                  struct game_state * state)
 {
   glBindBuffer(GL_ARRAY_BUFFER, plane_mesh.vtx);
@@ -302,7 +304,20 @@ void render_font(struct mesh plane_mesh,
   glUniform1i(uniform_texture0, 0);
 
   char dst[64];
-  int len = unparse_double(state->remaining, 4, 3, dst);
+
+  double remaining = state->remaining;
+  if (remaining < 0.0)
+    remaining = 0.0;
+  int len = unparse_double(remaining, 4, 1, dst);
+
+  vec3 base_color = vec3(1, 1, 1);
+  if (remaining == 0) {
+    base_color = vec3(abs(sin(state->time * 2)) * 0.6 + 0.4, 0.1, 0.1);
+    //base_color = vec3(1, 0.1, 0.1);
+  }
+
+  glUniform1f(uniform_time, state->time);
+  glUniform3fv(uniform_base_color, 1, &base_color[0]);
 
   int advance = 0;
   for (int i = 0; i < len; i++) {

src/shader/font.fp.glsl

@@ -2,7 +2,11 @@
 
 uniform sampler2D texture0;
 
+uniform vec3 base_color;
+uniform float time;
+
 varying vec2 fp_texture;
+varying vec2 fp_position;
 
 void main()
 {
@@ -13,6 +17,17 @@ void main()
 
   float i = c.x == 0 ? 0.0 : 1.0;
 
-  gl_FragColor = vec4(i, i, i, 1.0);
-  //gl_FragColor = vec4(fp_texture.xy, 1, 1.0);
+  vec2 uv = fp_position;
+  /*
+  float d = sin(uv.x * 0.1 + time * 0.1) / 0.1;
+  d = abs(d);
+  d = 0.01 / d;
+  */
+
+  float red_alpha = (1.0 - length(uv) + sin(time * 3) * abs(sin(time + uv.x * 2 + uv.y * 2)));
+
+  float alpha = (base_color.y == 1.0) ? 1.0 : red_alpha;
+  gl_FragColor = vec4(base_color * (i + alpha), 1.0);
+  //gl_FragColor = vec4(d, d, d, 1);
+  //gl_FragColor = vec4(fp_position.xy, 0, 1.0);
 }

src/shader/font.vp.glsl

@@ -4,7 +4,7 @@ attribute vec3 position;
 attribute vec2 _texture;
 
 varying vec2 fp_texture;
-varying vec2 fp_texture_trans;
+varying vec2 fp_position;
 
 uniform vec4 trans[4];
 uniform vec4 texture_trans[4];
@@ -31,6 +31,7 @@ void main()
   vec4 tt = transform4t(vec4(_texture, 0, 1));
 
   fp_texture = tt.xy;
+  fp_position = position.xz;
 
   gl_Position = pos;
 }

src/update.cpp

@@ -160,6 +160,10 @@ void update(struct game_state * state, double time)
     update_ball(state, state->balls[i], time);
   }
 
+  if (state->balls_launched == 0) {
+    state->start_time = time;
+  }
+
   state->time = time;
   state->remaining = 20.0 - (time - state->start_time);
 }