Merge pull request #28518 from clayjohn/GLES2-MSAA

Added MSAA to GLES2 backend

5 files changed, 309 insertions, 69 deletions

diff --git a/drivers/gles2/rasterizer_gles2.cpp b/drivers/gles2/rasterizer_gles2.cpp
index d3c6b041a8..f49f52e47b 100644
--- a/drivers/gles2/rasterizer_gles2.cpp
+++ b/drivers/gles2/rasterizer_gles2.cpp
@@ -202,6 +202,10 @@ Error RasterizerGLES2::is_viable() {
 			return ERR_UNAVAILABLE;
 		}
 	}
+
+	if (GLAD_GL_EXT_framebuffer_multisample) {
+		glRenderbufferStorageMultisample = glRenderbufferStorageMultisampleEXT;
+	}
 #endif // GLES_OVER_GL
 
 #endif // GLAD_ENABLED
diff --git a/drivers/gles2/rasterizer_scene_gles2.cpp b/drivers/gles2/rasterizer_scene_gles2.cpp
index 99eb0665d6..55257ab1c5 100644
--- a/drivers/gles2/rasterizer_scene_gles2.cpp
+++ b/drivers/gles2/rasterizer_scene_gles2.cpp
@@ -42,6 +42,16 @@
 #define glClearDepth glClearDepthf
 #endif
 
+#ifndef GLES_OVER_GL
+#ifdef IPHONE_ENABLED
+#include <OpenGLES/ES2/glext.h>
+//void *glResolveMultisampleFramebufferAPPLE;
+
+#define GL_READ_FRAMEBUFFER 0x8CA8
+#define GL_DRAW_FRAMEBUFFER 0x8CA9
+#endif
+#endif
+
 static const GLenum _cube_side_enum[6] = {
 
 	GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
@@ -1148,6 +1158,30 @@ void RasterizerSceneGLES2::_add_geometry_with_material(RasterizerStorageGLES2::G
 	}
 }
 
+void RasterizerSceneGLES2::_copy_texture_to_front_buffer(GLuint p_texture) {
+
+	//copy to front buffer
+	glBindFramebuffer(GL_FRAMEBUFFER, storage->frame.current_rt->fbo);
+
+	glDepthMask(GL_FALSE);
+	glDisable(GL_DEPTH_TEST);
+	glDisable(GL_CULL_FACE);
+	glDisable(GL_BLEND);
+	glDepthFunc(GL_LEQUAL);
+	glColorMask(1, 1, 1, 1);
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, p_texture);
+
+	glViewport(0, 0, storage->frame.current_rt->width, storage->frame.current_rt->height);
+
+	storage->shaders.copy.bind();
+
+	storage->bind_quad_array();
+	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+}
+
 void RasterizerSceneGLES2::_fill_render_list(InstanceBase **p_cull_result, int p_cull_count, bool p_depth_pass, bool p_shadow_pass) {
 
 	render_pass++;
@@ -2689,7 +2723,11 @@ void RasterizerSceneGLES2::render_scene(const Transform &p_cam_transform, const
 		if (storage->frame.current_rt->external.fbo != 0) {
 			current_fb = storage->frame.current_rt->external.fbo;
 		} else {
-			current_fb = storage->frame.current_rt->fbo;
+			if (storage->frame.current_rt->multisample_active) {
+				current_fb = storage->frame.current_rt->multisample_fbo;
+			} else {
+				current_fb = storage->frame.current_rt->fbo;
+			}
 		}
 		env = environment_owner.getornull(p_environment);
 
@@ -2838,7 +2876,38 @@ void RasterizerSceneGLES2::render_scene(const Transform &p_cam_transform, const
 
 	if (storage->frame.current_rt && state.used_screen_texture) {
 		//copy screen texture
+
+		if (storage->frame.current_rt && storage->frame.current_rt->multisample_active) {
+			// Resolve framebuffer to front buffer before copying
+#ifdef GLES_OVER_GL
+
+			glBindFramebuffer(GL_READ_FRAMEBUFFER, storage->frame.current_rt->multisample_fbo);
+			glReadBuffer(GL_COLOR_ATTACHMENT0);
+			glBindFramebuffer(GL_DRAW_FRAMEBUFFER, storage->frame.current_rt->fbo);
+			glBlitFramebuffer(0, 0, storage->frame.current_rt->width, storage->frame.current_rt->height, 0, 0, storage->frame.current_rt->width, storage->frame.current_rt->height, GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, GL_NEAREST);
+
+			glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+			glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+#elif IPHONE_ENABLED
+			glBindFramebuffer(GL_READ_FRAMEBUFFER, storage->frame.current_rt->multisample_fbo);
+			glBindFramebuffer(GL_DRAW_FRAMEBUFFER, storage->frame.current_rt->fbo);
+			glResolveMultisampleFramebufferAPPLE();
+
+			glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+			glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+#else
+			// In GLES2 Blit is not available, so just copy color texture manually
+			_copy_texture_to_front_buffer(storage->frame.current_rt->multisample_color);
+#endif
+		}
+
 		storage->canvas->_copy_screen(Rect2());
+
+		if (storage->frame.current_rt && storage->frame.current_rt->multisample_active) {
+			// Rebind the current framebuffer
+			glBindFramebuffer(GL_FRAMEBUFFER, current_fb);
+			glViewport(0, 0, viewport_width, viewport_height);
+		}
 	}
 	// alpha pass
 
@@ -2851,6 +2920,22 @@ void RasterizerSceneGLES2::render_scene(const Transform &p_cam_transform, const
 
 	glDisable(GL_DEPTH_TEST);
 
+	if (storage->frame.current_rt && storage->frame.current_rt->multisample_active) {
+#ifdef GLES_OVER_GL
+
+		glBindFramebuffer(GL_READ_FRAMEBUFFER, storage->frame.current_rt->multisample_fbo);
+		glReadBuffer(GL_COLOR_ATTACHMENT0);
+		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, storage->frame.current_rt->fbo);
+		glBlitFramebuffer(0, 0, storage->frame.current_rt->width, storage->frame.current_rt->height, 0, 0, storage->frame.current_rt->width, storage->frame.current_rt->height, GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT, GL_NEAREST);
+
+		glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
+		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+#else
+		// In GLES2 Blit is not available, so just copy color texture manually
+		_copy_texture_to_front_buffer(storage->frame.current_rt->multisample_color);
+#endif
+	}
+
 	//#define GLES2_SHADOW_ATLAS_DEBUG_VIEW
 
 #ifdef GLES2_SHADOW_ATLAS_DEBUG_VIEW
diff --git a/drivers/gles2/rasterizer_scene_gles2.h b/drivers/gles2/rasterizer_scene_gles2.h
index 48672991d1..e5f0bbcbbb 100644
--- a/drivers/gles2/rasterizer_scene_gles2.h
+++ b/drivers/gles2/rasterizer_scene_gles2.h
@@ -670,6 +670,7 @@ public:
 	void _add_geometry(RasterizerStorageGLES2::Geometry *p_geometry, InstanceBase *p_instance, RasterizerStorageGLES2::GeometryOwner *p_owner, int p_material, bool p_depth_pass, bool p_shadow_pass);
 	void _add_geometry_with_material(RasterizerStorageGLES2::Geometry *p_geometry, InstanceBase *p_instance, RasterizerStorageGLES2::GeometryOwner *p_owner, RasterizerStorageGLES2::Material *p_material, bool p_depth_pass, bool p_shadow_pass);
 
+	void _copy_texture_to_front_buffer(GLuint texture);
 	void _fill_render_list(InstanceBase **p_cull_result, int p_cull_count, bool p_depth_pass, bool p_shadow_pass);
 	void _render_render_list(RenderList::Element **p_elements, int p_element_count,
 			const Transform &p_view_transform,
diff --git a/drivers/gles2/rasterizer_storage_gles2.cpp b/drivers/gles2/rasterizer_storage_gles2.cpp
index 3f78588940..d709056709 100644
--- a/drivers/gles2/rasterizer_storage_gles2.cpp
+++ b/drivers/gles2/rasterizer_storage_gles2.cpp
@@ -81,6 +81,28 @@ GLuint RasterizerStorageGLES2::system_fbo = 0;
 
 #define _DEPTH_COMPONENT24_OES 0x81A6
 
+#ifndef GLES_OVER_GL
+// enable extensions manually for android and ios
+#include <dlfcn.h> // needed to load extensions
+
+#ifdef IPHONE_ENABLED
+
+#include <OpenGLES/ES2/glext.h>
+//void *glRenderbufferStorageMultisampleAPPLE;
+//void *glResolveMultisampleFramebufferAPPLE;
+#define glRenderbufferStorageMultisample glRenderbufferStorageMultisampleAPPLE
+#else
+
+#include <GLES2/gl2ext.h>
+PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC glRenderbufferStorageMultisampleEXT;
+PFNGLFRAMEBUFFERTEXTURE2DMULTISAMPLEEXTPROC glFramebufferTexture2DMultisampleEXT;
+#define glRenderbufferStorageMultisample glRenderbufferStorageMultisampleEXT
+#define glFramebufferTexture2DMultisample glFramebufferTexture2DMultisampleEXT
+#endif
+
+#define GL_MAX_SAMPLES 0x8D57
+#endif //!GLES_OVER_GL
+
 void RasterizerStorageGLES2::bind_quad_array() const {
 	glBindBuffer(GL_ARRAY_BUFFER, resources.quadie);
 	glVertexAttribPointer(VS::ARRAY_VERTEX, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 4, 0);
@@ -4549,95 +4571,174 @@ void RasterizerStorageGLES2::_render_target_allocate(RenderTarget *rt) {
 	if (rt->width <= 0 || rt->height <= 0)
 		return;
 
-	Texture *texture = texture_owner.getornull(rt->texture);
-	ERR_FAIL_COND(!texture);
-
-	// create fbo
-
-	glGenFramebuffers(1, &rt->fbo);
-	glBindFramebuffer(GL_FRAMEBUFFER, rt->fbo);
-
-	// color
-
-	glGenTextures(1, &rt->color);
-	glBindTexture(GL_TEXTURE_2D, rt->color);
+	GLuint color_internal_format;
+	GLuint color_format;
+	GLuint color_type = GL_UNSIGNED_BYTE;
 
 	if (rt->flags[RasterizerStorage::RENDER_TARGET_TRANSPARENT]) {
-		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, rt->width, rt->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+		color_internal_format = GL_RGBA;
+		color_format = GL_RGBA;
 	} else {
-		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, rt->width, rt->height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+		color_internal_format = GL_RGB;
+		color_format = GL_RGB;
 	}
 
-	if (texture->flags & VS::TEXTURE_FLAG_FILTER) {
+	{
 
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-	} else {
+		/* Front FBO */
 
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-	}
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		Texture *texture = texture_owner.getornull(rt->texture);
+		ERR_FAIL_COND(!texture);
 
-	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->color, 0);
+		// framebuffer
+		glGenFramebuffers(1, &rt->fbo);
+		glBindFramebuffer(GL_FRAMEBUFFER, rt->fbo);
 
-	// depth
+		// color
+		glGenTextures(1, &rt->color);
+		glBindTexture(GL_TEXTURE_2D, rt->color);
 
-	if (config.support_depth_texture) {
-		glGenTextures(1, &rt->depth);
-		glBindTexture(GL_TEXTURE_2D, rt->depth);
-		glTexImage2D(GL_TEXTURE_2D, 0, config.depth_internalformat, rt->width, rt->height, 0, GL_DEPTH_COMPONENT, config.depth_type, NULL);
+		glTexImage2D(GL_TEXTURE_2D, 0, color_internal_format, rt->width, rt->height, 0, color_format, color_type, NULL);
 
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		if (texture->flags & VS::TEXTURE_FLAG_FILTER) {
 
-		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, rt->depth, 0);
-	} else {
-		glGenRenderbuffers(1, &rt->depth);
-		glBindRenderbuffer(GL_RENDERBUFFER, rt->depth);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		} else {
 
-		glRenderbufferStorage(GL_RENDERBUFFER, config.depth_internalformat, rt->width, rt->height);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		}
 
-		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rt->depth);
-	}
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 
-	GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->color, 0);
 
-	if (status != GL_FRAMEBUFFER_COMPLETE) {
+		// depth
 
-		glDeleteFramebuffers(1, &rt->fbo);
 		if (config.support_depth_texture) {
-			glDeleteTextures(1, &rt->depth);
+
+			glGenTextures(1, &rt->depth);
+			glBindTexture(GL_TEXTURE_2D, rt->depth);
+			glTexImage2D(GL_TEXTURE_2D, 0, config.depth_internalformat, rt->width, rt->height, 0, GL_DEPTH_COMPONENT, config.depth_type, NULL);
+
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+			glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, rt->depth, 0);
 		} else {
-			glDeleteRenderbuffers(1, &rt->depth);
+
+			glGenRenderbuffers(1, &rt->depth);
+			glBindRenderbuffer(GL_RENDERBUFFER, rt->depth);
+
+			glRenderbufferStorage(GL_RENDERBUFFER, config.depth_internalformat, rt->width, rt->height);
+
+			glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rt->depth);
 		}
-		glDeleteTextures(1, &rt->color);
-		rt->fbo = 0;
-		rt->width = 0;
-		rt->height = 0;
-		rt->color = 0;
-		rt->depth = 0;
-		texture->tex_id = 0;
-		texture->active = false;
-		WARN_PRINT("Could not create framebuffer!!");
-		return;
+
+		GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+
+		if (status != GL_FRAMEBUFFER_COMPLETE) {
+
+			glDeleteFramebuffers(1, &rt->fbo);
+			if (config.support_depth_texture) {
+
+				glDeleteTextures(1, &rt->depth);
+			} else {
+
+				glDeleteRenderbuffers(1, &rt->depth);
+			}
+
+			glDeleteTextures(1, &rt->color);
+			rt->fbo = 0;
+			rt->width = 0;
+			rt->height = 0;
+			rt->color = 0;
+			rt->depth = 0;
+			texture->tex_id = 0;
+			texture->active = false;
+			WARN_PRINT("Could not create framebuffer!!");
+			return;
+		}
+
+		texture->format = Image::FORMAT_RGBA8;
+		texture->gl_format_cache = GL_RGBA;
+		texture->gl_type_cache = GL_UNSIGNED_BYTE;
+		texture->gl_internal_format_cache = GL_RGBA;
+		texture->tex_id = rt->color;
+		texture->width = rt->width;
+		texture->alloc_width = rt->width;
+		texture->height = rt->height;
+		texture->alloc_height = rt->height;
+		texture->active = true;
+
+		texture_set_flags(rt->texture, texture->flags);
 	}
 
-	texture->format = Image::FORMAT_RGBA8;
-	texture->gl_format_cache = GL_RGBA;
-	texture->gl_type_cache = GL_UNSIGNED_BYTE;
-	texture->gl_internal_format_cache = GL_RGBA;
-	texture->tex_id = rt->color;
-	texture->width = rt->width;
-	texture->alloc_width = rt->width;
-	texture->height = rt->height;
-	texture->alloc_height = rt->height;
-	texture->active = true;
+	/* BACK FBO */
+	/* For MSAA */
+
+	if (rt->msaa != VS::VIEWPORT_MSAA_DISABLED && config.multisample_supported) {
+
+		rt->multisample_active = true;
+
+		static const int msaa_value[] = { 0, 2, 4, 8, 16 };
+		int msaa = msaa_value[rt->msaa];
+
+		int max_samples = 0;
+		glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
+		if (msaa > max_samples) {
+			WARN_PRINTS("MSAA must be <= GL_MAX_SAMPLES, falling-back to GL_MAX_SAMPLES = " + itos(max_samples));
+			msaa = max_samples;
+		}
 
-	texture_set_flags(rt->texture, texture->flags);
+		//regular fbo
+		glGenFramebuffers(1, &rt->multisample_fbo);
+		glBindFramebuffer(GL_FRAMEBUFFER, rt->multisample_fbo);
+
+		glGenRenderbuffers(1, &rt->multisample_depth);
+		glBindRenderbuffer(GL_RENDERBUFFER, rt->multisample_depth);
+		glRenderbufferStorageMultisample(GL_RENDERBUFFER, msaa, config.depth_internalformat, rt->width, rt->height);
+
+		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, rt->multisample_depth);
+
+#if defined(GLES_OVER_GL) || defined(IPHONE_ENABLED)
+
+		glGenRenderbuffers(1, &rt->multisample_color);
+		glBindRenderbuffer(GL_RENDERBUFFER, rt->multisample_color);
+		glRenderbufferStorageMultisample(GL_RENDERBUFFER, msaa, color_internal_format, rt->width, rt->height);
+
+		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rt->multisample_color);
+#else
+		// Render to a texture in android
+		glGenTextures(1, &rt->multisample_color);
+		glBindTexture(GL_TEXTURE_2D, rt->multisample_color);
+
+		glTexImage2D(GL_TEXTURE_2D, 0, color_internal_format, rt->width, rt->height, 0, color_format, color_type, NULL);
+
+		// multisample buffer is same size as front buffer, so just use nearest
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+		glFramebufferTexture2DMultisample(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, rt->color, 0, msaa);
+#endif
+
+		GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+
+		if (status != GL_FRAMEBUFFER_COMPLETE) {
+			printf("err status: %x\n", status);
+			_render_target_clear(rt);
+			ERR_FAIL_COND(status != GL_FRAMEBUFFER_COMPLETE);
+		}
+
+		glBindRenderbuffer(GL_RENDERBUFFER, 0);
+
+	} else {
+		rt->multisample_active = false;
+	}
 
 	glClearColor(0, 0, 0, 0);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -4666,7 +4767,7 @@ void RasterizerStorageGLES2::_render_target_allocate(RenderTarget *rt) {
 		glClearColor(0, 0, 0, 0);
 		glClear(GL_COLOR_BUFFER_BIT);
 
-		status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+		GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
 		if (status != GL_FRAMEBUFFER_COMPLETE) {
 			_render_target_clear(rt);
 			ERR_FAIL_COND(status != GL_FRAMEBUFFER_COMPLETE);
@@ -4725,6 +4826,20 @@ void RasterizerStorageGLES2::_render_target_clear(RenderTarget *rt) {
 		glDeleteTextures(1, &rt->copy_screen_effect.color);
 		rt->copy_screen_effect.color = 0;
 	}
+
+	if (rt->multisample_active) {
+		glDeleteFramebuffers(1, &rt->multisample_fbo);
+		rt->multisample_fbo = 0;
+
+		glDeleteRenderbuffers(1, &rt->multisample_depth);
+		rt->multisample_depth = 0;
+#ifdef GLES_OVER_GL
+		glDeleteRenderbuffers(1, &rt->multisample_color);
+#else
+		glDeleteTextures(1, &rt->multisample_color);
+#endif
+		rt->multisample_color = 0;
+	}
 }
 
 RID RasterizerStorageGLES2::render_target_create() {
@@ -4926,6 +5041,11 @@ void RasterizerStorageGLES2::render_target_set_msaa(RID p_render_target, VS::Vie
 	if (rt->msaa == p_msaa)
 		return;
 
+	if (!config.multisample_supported) {
+		ERR_PRINT("MSAA not supported on this hardware.");
+		return;
+	}
+
 	_render_target_clear(rt);
 	rt->msaa = p_msaa;
 	_render_target_allocate(rt);
@@ -5449,6 +5569,26 @@ void RasterizerStorageGLES2::initialize() {
 	config.support_npot_repeat_mipmap = config.extensions.has("GL_OES_texture_npot");
 
 #endif
+
+#ifndef GLES_OVER_GL
+	//Manually load extensions for android and ios
+
+#ifdef IPHONE_ENABLED
+
+	//void *gles2_lib = dlopen(NULL, RTLD_LAZY);
+	//glRenderbufferStorageMultisampleAPPLE = dlsym(gles2_lib, "glRenderbufferStorageMultisampleAPPLE");
+	//glResolveMultisampleFramebufferAPPLE = dlsym(gles2_lib, "glResolveMultisampleFramebufferAPPLE");
+#else
+
+	void *gles2_lib = dlopen("libGLESv2.so", RTLD_LAZY);
+	glRenderbufferStorageMultisampleEXT = (PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC)dlsym(gles2_lib, "glRenderbufferStorageMultisampleEXT");
+	glFramebufferTexture2DMultisampleEXT = (PFNGLFRAMEBUFFERTEXTURE2DMULTISAMPLEEXTPROC)dlsym(gles2_lib, "glFramebufferTexture2DMultisampleEXT");
+#endif
+#endif
+
+	// Check for multisample support
+	config.multisample_supported = config.extensions.has("GL_EXT_framebuffer_multisample") || config.extensions.has("GL_EXT_multisampled_render_to_texture") || config.extensions.has("GL_APPLE_framebuffer_multisample");
+
 #ifdef GLES_OVER_GL
 	config.use_rgba_2d_shadows = false;
 	config.support_depth_texture = true;
diff --git a/drivers/gles2/rasterizer_storage_gles2.h b/drivers/gles2/rasterizer_storage_gles2.h
index d6130849fb..3134082e2a 100644
--- a/drivers/gles2/rasterizer_storage_gles2.h
+++ b/drivers/gles2/rasterizer_storage_gles2.h
@@ -92,6 +92,8 @@ public:
 
 		bool support_shadow_cubemaps;
 
+		bool multisample_supported;
+
 		GLuint depth_internalformat;
 		GLuint depth_type;
 
@@ -1132,10 +1134,14 @@ public:
 
 	struct RenderTarget : public RID_Data {
 		GLuint fbo;
-
 		GLuint color;
 		GLuint depth;
 
+		GLuint multisample_fbo;
+		GLuint multisample_color;
+		GLuint multisample_depth;
+		bool multisample_active;
+
 		// TODO post processing effects?
 
 		// TODO HDR?
@@ -1182,6 +1188,10 @@ public:
 				fbo(0),
 				color(0),
 				depth(0),
+				multisample_fbo(0),
+				multisample_color(0),
+				multisample_depth(0),
+				multisample_active(false),
 				width(0),
 				height(0),
 				used_in_frame(false),