[Bf-blender-cvs] [7bb7c3e5cb0] temp-eeveelightcache: GPUTexture: Fix mipmap size calculation.

[Clément Foucault]

Commit: 7bb7c3e5cb049d5e3d79c6fe6e2b8dac31c6487c
Author: Clément Foucault
Date:   Mon Jul 9 15:34:01 2018 +0200
Branches: temp-eeveelightcache
https://developer.blender.org/rB7bb7c3e5cb049d5e3d79c6fe6e2b8dac31c6487c

GPUTexture: Fix mipmap size calculation.

===================================================================

M	source/blender/gpu/intern/gpu_texture.c

===================================================================

diff --git a/source/blender/gpu/intern/gpu_texture.c b/source/blender/gpu/intern/gpu_texture.c
index 2df6ed7ca5b..6bed59cef04 100644
--- a/source/blender/gpu/intern/gpu_texture.c
+++ b/source/blender/gpu/intern/gpu_texture.c
@@ -1068,10 +1068,17 @@ void GPU_texture_update_sub(
 
 void *GPU_texture_read(GPUTexture *tex, GPUDataFormat gpu_data_format, int miplvl)
 {
+	int size[3] = {0, 0, 0};
+	GPU_texture_get_mipmap_size(tex, miplvl, size);
+
 	gpu_validate_data_format(tex->format, gpu_data_format);
 
 	size_t buf_size = gpu_texture_memory_footprint_compute(tex);
-	size_t samples_count = (buf_size / tex->bytesize);
+	size_t samples_count = max_ii(1, tex->samples);
+
+	samples_count *= size[0];
+	samples_count *= max_ii(1, size[1]);
+	samples_count *= max_ii(1, size[2]);
 
 	switch (gpu_data_format) {
 		case GPU_DATA_FLOAT: