From 0d12d552958791d509ca77b50d17130ea01c0b22 Mon Sep 17 00:00:00 2001
From: Delyan Angelov <delian66@gmail.com>
Date: Mon, 26 Jul 2021 11:05:16 +0300
Subject: [PATCH] gg: allow customisation of the image format in
 gg.new_streaming_image

---
 examples/gg/random.v |  2 +-
 vlib/gg/image.v      | 22 ++++++++++++++++------
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/examples/gg/random.v b/examples/gg/random.v
index 55304c8f94..f9e963b849 100644
--- a/examples/gg/random.v
+++ b/examples/gg/random.v
@@ -38,7 +38,7 @@ fn (mut state AppState) draw() {
 // gg callbacks:
 
 fn graphics_init(mut state AppState) {
-	state.istream_idx = state.gg.new_streaming_image(pwidth, pheight, pbytes)
+	state.istream_idx = state.gg.new_streaming_image(pwidth, pheight, pbytes, pixel_format: .rgba8)
 }
 
 fn graphics_frame(mut state AppState) {
diff --git a/vlib/gg/image.v b/vlib/gg/image.v
index 2ac084b4b4..89a16d7e92 100644
--- a/vlib/gg/image.v
+++ b/vlib/gg/image.v
@@ -185,11 +185,21 @@ pub fn (mut img Image) init_sokol_image() &Image {
 	return img
 }
 
+pub struct StreamingImageConfig {
+	pixel_format gfx.PixelFormat = .rgba8
+	wrap_u       gfx.Wrap        = .clamp_to_edge
+	wrap_v       gfx.Wrap        = .clamp_to_edge
+	min_filter   gfx.Filter      = .linear
+	mag_filter   gfx.Filter      = .linear
+	num_mipmaps  int = 1
+	num_slices   int = 1
+}
+
 // new_streaming_image returns a cached `image_idx` of a special image, that
 // can be updated *each frame* by calling:  gg.update_pixel_data(image_idx, buf)
 // ... where buf is a pointer to the actual pixel data for the image.
 // NB: you still need to call app.gg.draw_image after that, to actually draw it.
-pub fn (mut ctx Context) new_streaming_image(w int, h int, channels int) int {
+pub fn (mut ctx Context) new_streaming_image(w int, h int, channels int, sicfg StreamingImageConfig) int {
 	mut img := Image{}
 	img.width = w
 	img.height = h
@@ -197,14 +207,14 @@ pub fn (mut ctx Context) new_streaming_image(w int, h int, channels int) int {
 	mut img_desc := C.sg_image_desc{
 		width: img.width
 		height: img.height
-		pixel_format: .rgba8
+		pixel_format: sicfg.pixel_format
 		num_slices: 1
 		num_mipmaps: 1
 		usage: .stream
-		wrap_u: .clamp_to_edge
-		wrap_v: .clamp_to_edge
-		min_filter: .linear
-		mag_filter: .linear
+		wrap_u: sicfg.wrap_u
+		wrap_v: sicfg.wrap_v
+		min_filter: sicfg.min_filter
+		mag_filter: sicfg.mag_filter
 		label: img.path.str
 	}
 	// Sokol requires that streamed images have NO .ptr/.size initially: