TapirEngine: Implement UVScroll mesh attribute

shaders/reign.v.glsl

@@ -39,6 +39,12 @@ out vec3 specular_dir;
 out vec3 ls_ex;
 out vec3 ls_in;
 
+const vec2 uv_scroll = vec2(0.0);
+
+#else // ENGINE == REIGN_ENGINE
+
+uniform vec2 uv_scroll;
+
 #endif // ENGINE == REIGN_ENGINE
 
 uniform mat4 local_transform;
@@ -104,8 +110,8 @@ void main() {
 	vec4 view_pos = view_transform * world_pos;
 	gl_Position = proj_transform * view_pos;
 
-	tex_coord = vertex_uv;
-	light_tex_coord = vertex_light_uv;
+	tex_coord = vertex_uv + uv_scroll;
+	light_tex_coord = vertex_light_uv + uv_scroll;
 	color_mod = vertex_color;
 	dist = -view_pos.z;
 	shadow_frag_pos = shadow_transform * world_pos;

src/3d/3d_internal.h

@@ -177,6 +177,7 @@ struct RE_renderer {
 	GLint ls_sun_color;
 	GLint alpha_mode;
 	GLint alpha_texture;
+	GLint uv_scroll;
 
 	GLuint billboard_vao;
 	GLuint billboard_attr_buffer;

src/3d/renderer.c

@@ -254,6 +254,7 @@ struct RE_renderer *RE_renderer_new(enum RE_plugin_version version)
 	r->ls_sun_color = glGetUniformLocation(r->program, "ls_sun_color");
 	r->alpha_mode = glGetUniformLocation(r->program, "alpha_mode");
 	r->alpha_texture = glGetUniformLocation(r->program, "alpha_texture");
+	r->uv_scroll = glGetUniformLocation(r->program, "uv_scroll");
 
 	glGenRenderbuffers(1, &r->depth_buffer);
 
@@ -429,6 +430,10 @@ static void render_model(struct RE_instance *inst, struct RE_renderer *r, enum d
 			glUniform1i(r->alpha_mode, ALPHA_BLEND);
 		}
 
+		vec2 uv_scroll;
+		glm_vec2_scale(mesh->uv_scroll, r->last_frame_timestamp / 1000.f, uv_scroll);
+		glUniform2fv(r->uv_scroll, 1, uv_scroll);
+
 		glBindVertexArray(mesh->vao);
 
 		if (mesh->nr_indices)