From 4f19b69f16e7d844c739bcd33a541b2a54230fc6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johan=20S=C3=B6derlind=20=C3=85str=C3=B6m?=
 <johan.soderlind.astrom@gmail.com>
Date: Sun, 18 Jan 2026 22:19:44 +0100
Subject: [PATCH] Added DrawMeshInstancedColumnMajor

---
 src/raylib.h  |  1 +
 src/rmodels.c | 24 +++++++++++++++---------
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/src/raylib.h b/src/raylib.h
index 177138dc9..d01877a3f 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -1591,6 +1591,7 @@ RLAPI void UpdateMeshBuffer(Mesh mesh, int index, const void *data, int dataSize
 RLAPI void UnloadMesh(Mesh mesh);                                                           // Unload mesh data from CPU and GPU
 RLAPI void DrawMesh(Mesh mesh, Material material, Matrix transform);                        // Draw a 3d mesh with material and transform
 RLAPI void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, int instances); // Draw multiple mesh instances with material and different transforms
+RLAPI void DrawMeshInstancedColumnMajor(Mesh mesh, Material material, const void *transforms, int instances); // Draw multiple mesh instances with material and different transforms
 RLAPI BoundingBox GetMeshBoundingBox(Mesh mesh);                                            // Compute mesh bounding box limits
 RLAPI void GenMeshTangents(Mesh *mesh);                                                     // Compute mesh tangents
 RLAPI bool ExportMesh(Mesh mesh, const char *fileName);                                     // Export mesh data to file, returns true on success
diff --git a/src/rmodels.c b/src/rmodels.c
index 58b08350d..ceb34de5b 100644
--- a/src/rmodels.c
+++ b/src/rmodels.c
@@ -1690,11 +1690,9 @@ void DrawMesh(Mesh mesh, Material material, Matrix transform)
 }
 
 // Draw multiple mesh instances with material and different transforms
-void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, int instances)
+void DrawMeshInstancedColumnMajor(Mesh mesh, Material material, const void * transforms, int instances)
 {
 #if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
-    // Instancing required variables
-    float16 *instanceTransforms = NULL;
     unsigned int instancesVboId = 0;
 
     // Bind shader program
@@ -1742,11 +1740,7 @@ void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, i
     if (material.shader.locs[SHADER_LOC_MATRIX_VIEW] != -1) rlSetUniformMatrix(material.shader.locs[SHADER_LOC_MATRIX_VIEW], matView);
     if (material.shader.locs[SHADER_LOC_MATRIX_PROJECTION] != -1) rlSetUniformMatrix(material.shader.locs[SHADER_LOC_MATRIX_PROJECTION], matProjection);
 
-    // Create instances buffer
-    instanceTransforms = (float16 *)RL_MALLOC(instances*sizeof(float16));
 
-    // Fill buffer with instances transformations as float16 arrays
-    for (int i = 0; i < instances; i++) instanceTransforms[i] = MatrixToFloatV(transforms[i]);
 
     // Enable mesh VAO to attach new buffer
     rlEnableVertexArray(mesh.vaoId);
@@ -1755,7 +1749,7 @@ void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, i
     // It isn't clear which would be reliably faster in all cases and on all platforms,
     // anecdotally glMapBuffer() seems very slow (syncs) while glBufferSubData() seems
     // no faster, since we're transferring all the transform matrices anyway
-    instancesVboId = rlLoadVertexBuffer(instanceTransforms, instances*sizeof(float16), false);
+    instancesVboId = rlLoadVertexBuffer(transforms, instances*sizeof(float16), false);
 
     // Instances transformation matrices are sent to shader attribute location: SHADER_LOC_VERTEX_INSTANCE_TX
     if (material.shader.locs[SHADER_LOC_VERTEX_INSTANCE_TX] != -1)
@@ -1933,10 +1927,22 @@ void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, i
 
     // Remove instance transforms buffer
     rlUnloadVertexBuffer(instancesVboId);
-    RL_FREE(instanceTransforms);
 #endif
 }
 
+void DrawMeshInstanced(Mesh mesh, Material material, const Matrix *transforms, int instances)
+{
+    // Create instances buffer
+    float16 *instanceTransforms = NULL;
+    instanceTransforms = (float16 *)RL_MALLOC(instances*sizeof(float16));
+
+    // Fill buffer with instances transformations as float16 arrays
+    for (int i = 0; i < instances; i++) instanceTransforms[i] = MatrixToFloatV(transforms[i]);
+    DrawMeshInstancedColumnMajor(mesh, material, instanceTransforms, instances);
+    
+    RL_FREE(instanceTransforms);
+}
+
 // Unload mesh from memory (RAM and VRAM)
 void UnloadMesh(Mesh mesh)
 {