From d4fbf422b3c8715d9fbb2fc19deff8d65be4c6a7 Mon Sep 17 00:00:00 2001
From: Delyan Angelov <delian66@gmail.com>
Date: Sun, 20 Sep 2020 12:05:30 +0300
Subject: [PATCH] gg: support transparency for rect/triangle/etc primitives too

---
 examples/tetris/tetris.v |  2 +-
 vlib/gg/gg.v             | 12 ++++++++++++
 vlib/gg/text_rendering.v |  6 +++++-
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/examples/tetris/tetris.v b/examples/tetris/tetris.v
index a6a3cdb707..2ac6e07de3 100644
--- a/examples/tetris/tetris.v
+++ b/examples/tetris/tetris.v
@@ -87,7 +87,7 @@ const (
 	]
 
 	background_color = gx.white
-	ui_color = gx.red
+	ui_color = gx.rgba(255,0,0, 210)
 )
 
 // TODO: type Tetro [tetro_size]struct{ x, y int }
diff --git a/vlib/gg/gg.v b/vlib/gg/gg.v
index 5410cd4b33..12859543de 100644
--- a/vlib/gg/gg.v
+++ b/vlib/gg/gg.v
@@ -226,6 +226,9 @@ pub fn (mut ctx Context) set_bg_color(c gx.Color) {
 
 // TODO: Fix alpha
 pub fn (ctx &Context) draw_rect(x, y, w, h f32, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
 	sgl.c4b(c.r, c.g, c.b, c.a)
 	sgl.begin_quads()
 	sgl.v2f(x * ctx.scale, y * ctx.scale)
@@ -236,6 +239,9 @@ pub fn (ctx &Context) draw_rect(x, y, w, h f32, c gx.Color) {
 }
 
 pub fn (ctx &Context) draw_triangle(x, y, x2, y2, x3, y3 f32, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
 	sgl.c4b(c.r, c.g, c.b, c.a)
 	sgl.begin_quads()
 	sgl.v2f(x * ctx.scale, y * ctx.scale)
@@ -245,6 +251,9 @@ pub fn (ctx &Context) draw_triangle(x, y, x2, y2, x3, y3 f32, c gx.Color) {
 }
 
 pub fn (ctx &Context) draw_empty_rect(x, y, w, h f32, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
 	sgl.c4b(c.r, c.g, c.b, c.a)
 	sgl.begin_line_strip()
 	if ctx.scale == 1 {
@@ -295,6 +304,9 @@ fn abs(a f32) f32 {
 
 
 pub fn (ctx &Context) draw_line(x, y, x2, y2 f32, c gx.Color) {
+	if c.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
 	if ctx.scale > 1 {
 		// Make the line more clear on hi dpi screens: draw a rectangle
 		mut width := abs(x2 - x)
diff --git a/vlib/gg/text_rendering.v b/vlib/gg/text_rendering.v
index ca97aa16ea..f7fbb283da 100644
--- a/vlib/gg/text_rendering.v
+++ b/vlib/gg/text_rendering.v
@@ -3,6 +3,7 @@
 module gg
 
 import sokol.sfons
+import sokol.sgl
 import gx
 import os
 
@@ -94,7 +95,10 @@ fn (ctx &Context) set_cfg(cfg gx.TextCfg) {
 	size := if cfg.mono { cfg.size - 2 } else { cfg.size }
 	ctx.ft.fons.set_size(scale * f32(size))
 	C.fonsSetAlign(ctx.ft.fons, int(cfg.align) | int(cfg.vertical_align))
-	color := C.sfons_rgba(cfg.color.r, cfg.color.g, cfg.color.b, 255)
+	color := C.sfons_rgba(cfg.color.r, cfg.color.g, cfg.color.b, cfg.color.a)
+	if cfg.color.a != 255 {
+		sgl.load_pipeline(ctx.timage_pip)
+	}
 	C.fonsSetColor(ctx.ft.fons, color)
 	ascender := f32(0.0)
 	descender := f32(0.0)