gl-renderer: Replace pbuffer-create args with struct

gl_rendererer's output_pbuffer_create has a lot of arguments now. Add a
structure for the options to make it more clear what is what.
This is in preparation for adding bare-integer arguments which are ripe
for confusion when passing positional arguments.

Signed-off-by: Daniel Stone <daniels@collabora.com>

libweston/backend-headless/headless.c

@@ -196,12 +196,14 @@ headless_output_enable_gl(struct headless_output *output)
 {
 	struct weston_compositor *compositor = output->base.compositor;
 	struct headless_backend *b = to_headless_backend(compositor);
+	const struct gl_renderer_pbuffer_options options = {
+		.width = output->base.current_mode->width,
+		.height = output->base.current_mode->height,
+		.drm_formats = headless_formats,
+		.drm_formats_count = ARRAY_LENGTH(headless_formats),
+	};
 
-	if (b->glri->output_pbuffer_create(&output->base,
-					   output->base.current_mode->width,
-					   output->base.current_mode->height,
-					   headless_formats,
-					   ARRAY_LENGTH(headless_formats)) < 0) {
+	if (b->glri->output_pbuffer_create(&output->base, &options) < 0) {
 		weston_log("failed to create gl renderer output state\n");
 		return -1;
 	}

libweston/renderer-gl/gl-renderer.c

@@ -3198,24 +3198,21 @@ gl_renderer_output_window_create(struct weston_output *output,
 
 static int
 gl_renderer_output_pbuffer_create(struct weston_output *output,
-				  int width,
-				  int height,
-				  const uint32_t *drm_formats,
-				  unsigned drm_formats_count)
+				  const struct gl_renderer_pbuffer_options *options)
 {
 	struct gl_renderer *gr = get_renderer(output->compositor);
 	EGLConfig pbuffer_config;
 	EGLSurface egl_surface;
 	int ret;
 	EGLint pbuffer_attribs[] = {
-		EGL_WIDTH, width,
-		EGL_HEIGHT, height,
+		EGL_WIDTH, options->width,
+		EGL_HEIGHT, options->height,
 		EGL_NONE
 	};
 
 	pbuffer_config = gl_renderer_get_egl_config(gr, EGL_PBUFFER_BIT,
-						    drm_formats,
-						    drm_formats_count);
+						    options->drm_formats,
+						    options->drm_formats_count);
 	if (pbuffer_config == EGL_NO_CONFIG_KHR) {
 		weston_log("failed to choose EGL config for PbufferSurface\n");
 		return -1;

libweston/renderer-gl/gl-renderer.h

@@ -87,6 +87,17 @@ struct gl_renderer_output_options {
 	unsigned drm_formats_count;
 };
 
+struct gl_renderer_pbuffer_options {
+	/** Width of the rendering surface in pixels */
+	int width;
+	/** Height of the rendering surface in pixels */
+	int height;
+	/** Array of DRM pixel formats acceptable for the pbuffer */
+	const uint32_t *drm_formats;
+	/** The \c drm_formats array length */
+	unsigned drm_formats_count;
+};
+
 struct gl_renderer_interface {
 	/**
 	 * Initialize GL-renderer with the given EGL platform and native display
@@ -150,10 +161,7 @@ struct gl_renderer_interface {
 	 * Attach GL-renderer to the output with internal pixel storage
 	 *
 	 * \param output The output to create a rendering surface for.
-	 * \param width Width of the rendering surface in pixels.
-	 * \param height Height of the rendering surface in pixels.
-	 * \param drm_formats Array of DRM pixel formats that are acceptable.
-	 * \param drm_formats_count The drm_formats array length.
+	 * \param options The options struct describing the pbuffer
 	 * \return 0 on success, -1 on failure.
 	 *
 	 * This function creates the renderer data structures needed to repaint
@@ -168,10 +176,7 @@ struct gl_renderer_interface {
 	 * with \c EGL_PBUFFER_BIT in \c egl_surface_type.
 	 */
 	int (*output_pbuffer_create)(struct weston_output *output,
-				     int width,
-				     int height,
-				     const uint32_t *drm_formats,
-				     unsigned drm_formats_count);
+				     const struct gl_renderer_pbuffer_options *options);
 
 	void (*output_destroy)(struct weston_output *output);