From d6e30256ad7e2660db796b41cf8a7bf073aa6d09 Mon Sep 17 00:00:00 2001
From: Juan Linietsky
Date: Wed, 4 May 2016 12:36:51 -0300
Subject: ability to shrink all images x2 on load

this is for extreme cases when running on devices with very low video
memory, so you can still retain compatibility.
---
 drivers/gles2/rasterizer_gles2.cpp | 19 ++++++++++++++++++-
 drivers/gles2/rasterizer_gles2.h   |  4 ++++
 2 files changed, 22 insertions(+), 1 deletion(-)

(limited to 'drivers')

diff --git a/drivers/gles2/rasterizer_gles2.cpp b/drivers/gles2/rasterizer_gles2.cpp
index 4b976c5b0..2d1bda005 100644
--- a/drivers/gles2/rasterizer_gles2.cpp
+++ b/drivers/gles2/rasterizer_gles2.cpp
@@ -921,6 +921,11 @@ void RasterizerGLES2::texture_allocate(RID p_texture,int p_width, int p_height,I
 		texture->alloc_height = texture->height;
 	};
 
+	if (shrink_textures_x2) {
+		texture->alloc_height = MAX(1,texture->alloc_height/2);
+		texture->alloc_width = MAX(1,texture->alloc_width/2);
+	}
+
 
 	texture->gl_components_cache=components;
 	texture->gl_format_cache=format;
@@ -970,8 +975,15 @@ void RasterizerGLES2::texture_set_data(RID p_texture,const Image& p_image,VS::Cu
 
 	if (texture->alloc_width != img.get_width() || texture->alloc_height != img.get_height()) {
 
-		if (img.get_format() <= Image::FORMAT_INDEXED_ALPHA)
+
+		if (texture->alloc_width == img.get_width()/2 && texture->alloc_height == img.get_height()/2) {
+
+			img.shrink_x2();
+		} else if (img.get_format() <= Image::FORMAT_INDEXED_ALPHA) {
+
 			img.resize(texture->alloc_width, texture->alloc_height, Image::INTERPOLATE_BILINEAR);
+
+		}
 	};
 
 
@@ -1452,6 +1464,11 @@ void RasterizerGLES2::texture_debug_usage(List<VS::TextureInfo> *r_info){
 
 }
 
+void RasterizerGLES2::texture_set_shrink_all_x2_on_set_data(bool p_enable) {
+
+	shrink_textures_x2=p_enable;
+}
+
 /* SHADER API */
 
 RID RasterizerGLES2::shader_create(VS::ShaderMode p_mode) {
diff --git a/drivers/gles2/rasterizer_gles2.h b/drivers/gles2/rasterizer_gles2.h
index 0f70ceaa9..d74daf37d 100644
--- a/drivers/gles2/rasterizer_gles2.h
+++ b/drivers/gles2/rasterizer_gles2.h
@@ -108,6 +108,8 @@ class RasterizerGLES2 : public Rasterizer {
 	bool use_half_float;
 	bool low_memory_2d;
 
+	bool shrink_textures_x2;
+
 	Vector<float> skel_default;
 
 	Image _get_gl_image_and_format(const Image& p_image, Image::Format p_format, uint32_t p_flags,GLenum& r_gl_format,GLenum& r_gl_internal_format,int &r_gl_components,bool &r_has_alpha_cache,bool &r_compressed);
@@ -1334,6 +1336,8 @@ public:
 	virtual String texture_get_path(RID p_texture) const;
 	virtual void texture_debug_usage(List<VS::TextureInfo> *r_info);
 
+	virtual void texture_set_shrink_all_x2_on_set_data(bool p_enable);
+
 	GLuint _texture_get_name(RID p_tex);
 
 	/* SHADER API */
-- 
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