SDL: Update METAL backend for SDL_RenderGeometryRaw

From 9f591707438db3b6f850840c270adaf900baba0a Mon Sep 17 00:00:00 2001
From: Sylvain Becker <[EMAIL REDACTED]>
Date: Thu, 1 Apr 2021 10:37:45 +0200
Subject: [PATCH] Update METAL backend for SDL_RenderGeometryRaw

---
 src/render/metal/SDL_render_metal.m | 37 ++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 11 deletions(-)

diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index eb3129b17c..2b90288da4 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1379,7 +1379,9 @@ - (void)dealloc
 
 static int
 METAL_QueueGeometry(SDL_Renderer *renderer, SDL_RenderCommand *cmd, SDL_Texture *texture,
-        SDL_Vertex *vertices, int num_vertices, int *indices, int num_indices, float scale_x, float scale_y)
+        const float *xy, int xy_stride, const int *color, int color_stride, const float *uv, int uv_stride,
+        int num_vertices, const void *indices, int num_indices, int size_indice,
+        float scale_x, float scale_y)
 {
     int count = indices ? num_indices : num_vertices;
     int sz = 2 + 4 + (texture ? 2 : 0);
@@ -1392,22 +1394,35 @@ - (void)dealloc
     cmd->data.draw.count = count;
 
     for (int i = 0; i < count; i++) {
-        SDL_Vertex *v = &vertices[indices ? indices[i] : i];
+        int j;
+        if (size_indice == 4) {
+            j = ((const Uint32 *)indices)[i];
+        } else if (size_indice == 2) {
+            j = ((const Uint16 *)indices)[i];
+        } else if (size_indice == 1) {
+            j = ((const Uint8 *)indices)[i];
+        } else {
+            j = i;
+        }
+
+        float *xy_ = (float *)((char*)xy + j * xy_stride);
+        SDL_Color col_ = *(SDL_Color *)((char*)color + j * color_stride);
 
-        *(verts++) = v->position.x * scale_x;
-        *(verts++) = v->position.y * scale_y;
+        *(verts++) = xy_[0] * scale_x;
+        *(verts++) = xy_[1] * scale_y;
 
-        *(verts++) = v->color.r * inv255f;
-        *(verts++) = v->color.g * inv255f;
-        *(verts++) = v->color.b * inv255f;
-        *(verts++) = v->color.a * inv255f;
+        *(verts++) = col_.r * inv255f;
+        *(verts++) = col_.g * inv255f;
+        *(verts++) = col_.b * inv255f;
+        *(verts++) = col_.a * inv255f;
 
         if (texture) {
-            *(verts++) = v->tex_coord.x;
-            *(verts++) = v->tex_coord.y;
+            float *uv_ = (float *)((char*)uv + j * uv_stride);
+            *(verts++) = uv_[0];
+            *(verts++) = uv_[1];
         }
     }
- 
+
     return 0;
 }