iFrame

.gitignore

@@ -6,3 +6,4 @@ wlr-layer-shell-unstable-v1-protocol.h
 wlr-layer-shell-unstable-v1-protocol.c
 xdg-shell-protocol.h
 xdg-shell-protocol.c
+shaders/

renderer.c

@@ -45,6 +45,7 @@ const char *fragment_header_src =
 "layout(location = 0) out vec4 color;\n"
 "uniform vec2 iResolution;\n"
 "uniform float iTime;\n"
+"uniform int iFrame;\n"
 "void mainImage(out vec4 fragColor, in vec2 fragCoord);\n"
 "void main() {\n"
 "   mainImage(color, gl_FragCoord.xy);\n"
@@ -155,7 +156,11 @@ Renderer new_renderer() {
         (void *)0
     );
 
-    Renderer renderer = { "", 0, vao };
+    Renderer renderer;
+    renderer.shader_path = "";
+    renderer.shader = 0;
+    renderer.vao = vao;
+    renderer.frame_nr = 0;
     return renderer;
 }
 
@@ -177,6 +182,8 @@ void render(Renderer *state, int w, int h, double time, char *shader_path, int r
         state->shader_path = shader_path;
     }
 
+    state->frame_nr++;
+
     // Rendorrrr
     glViewport(0, 0, w, h);
 
@@ -192,6 +199,9 @@ void render(Renderer *state, int w, int h, double time, char *shader_path, int r
     int uniform_iTime = glGetUniformLocation(state->shader, "iTime");
     glUniform1f(uniform_iTime, (float)time);
 
+    int uniform_iFrame = glGetUniformLocation(state->shader, "iFrame");
+    glUniform1i(uniform_iFrame, state->frame_nr);
+
     glBindVertexArray(state->vao);
     glDrawArrays(GL_TRIANGLES, 0, 6);
 }

renderer.h

@@ -7,6 +7,8 @@ typedef struct Renderer {
     char *shader_path;
     unsigned int shader;
     unsigned int vao;
+    /// The currently rendered frame.
+    unsigned int frame_nr;
     struct stat shader_file_modified;
 } Renderer;