From 92f2fdfc84c0efed42198b9ccc5857870f9ad85d Mon Sep 17 00:00:00 2001
From: Sylvain <[EMAIL REDACTED]>
Date: Mon, 15 Nov 2021 09:36:18 +0100
Subject: [PATCH] GLES2: batch non joined lines (see #4964)
---
src/render/opengles2/SDL_render_gles2.c | 26 ++++++++++++++++++++++++-
1 file changed, 25 insertions(+), 1 deletion(-)
diff --git a/src/render/opengles2/SDL_render_gles2.c b/src/render/opengles2/SDL_render_gles2.c
index 6602c62813..7a39c72371 100644
--- a/src/render/opengles2/SDL_render_gles2.c
+++ b/src/render/opengles2/SDL_render_gles2.c
@@ -1136,7 +1136,31 @@ GLES2_RunCommandQueue(SDL_Renderer * renderer, SDL_RenderCommand *cmd, void *ver
case SDL_RENDERCMD_DRAW_LINES: {
if (SetDrawState(data, cmd, GLES2_IMAGESOURCE_SOLID) == 0) {
- data->glDrawArrays(GL_LINE_STRIP, 0, (GLsizei) cmd->data.draw.count);
+ size_t count = cmd->data.draw.count;
+ if (count > 2) {
+ /* joined lines cannot be grouped */
+ data->glDrawArrays(GL_LINE_STRIP, 0, (GLsizei)count);
+ } else {
+ /* let's group non joined lines */
+ SDL_RenderCommand *finalcmd = cmd;
+ SDL_RenderCommand *nextcmd = cmd->next;
+
+ while (nextcmd != NULL) {
+ const SDL_RenderCommandType nextcmdtype = nextcmd->command;
+ if (nextcmdtype != SDL_RENDERCMD_DRAW_LINES) {
+ break; /* can't go any further on this draw call, different render command up next. */
+ } else if (nextcmd->data.draw.count != 2) {
+ break; /* can't go any further on this draw call, those are joined lines */
+ } else {
+ finalcmd = nextcmd; /* we can combine copy operations here. Mark this one as the furthest okay command. */
+ count += cmd->data.draw.count;
+ }
+ nextcmd = nextcmd->next;
+ }
+
+ data->glDrawArrays(GL_LINES, 0, (GLsizei)count);
+ cmd = finalcmd; /* skip any copy commands we just combined in here. */
+ }
}
break;
}