From 9d635f06298f84a59160e8e8cce0187cde6cf74e Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Tue, 22 Nov 2016 20:51:56 -0300
Subject: Migrated from GLES to GLAD, fixes many issues.

---
 drivers/gles3/rasterizer_canvas_gles3.cpp  | 134 ++++++++++++++++-------------
 drivers/gles3/rasterizer_canvas_gles3.h    |   3 +
 drivers/gles3/rasterizer_gles3.cpp         |  77 +++++++++++++----
 drivers/gles3/rasterizer_scene_gles3.cpp   |  21 +++--
 drivers/gles3/rasterizer_storage_gles3.cpp |  93 ++++++++++++++------
 drivers/gles3/shader_gles3.cpp             |   6 +-
 6 files changed, 220 insertions(+), 114 deletions(-)

(limited to 'drivers/gles3')

diff --git a/drivers/gles3/rasterizer_canvas_gles3.cpp b/drivers/gles3/rasterizer_canvas_gles3.cpp
index 10a8912561..1f23387516 100644
--- a/drivers/gles3/rasterizer_canvas_gles3.cpp
+++ b/drivers/gles3/rasterizer_canvas_gles3.cpp
@@ -274,17 +274,7 @@ void RasterizerCanvasGLES3::_draw_polygon(int p_vertex_count, const int* p_indic
 	}
 
 	if (p_indices) {
-#ifdef GLEW_ENABLED
 		glDrawElements(GL_TRIANGLES, p_vertex_count, GL_UNSIGNED_INT, p_indices );
-#else
-		static const int _max_draw_poly_indices = 16*1024; // change this size if needed!!!
-		ERR_FAIL_COND(p_vertex_count > _max_draw_poly_indices);
-		static uint16_t _draw_poly_indices[_max_draw_poly_indices];
-		for (int i=0; i<p_vertex_count; i++) {
-			_draw_poly_indices[i] = p_indices[i];
-		};
-		glDrawElements(GL_TRIANGLES, p_vertex_count, GL_UNSIGNED_SHORT, _draw_poly_indices );
-#endif
 	} else {
 		glDrawArrays(GL_TRIANGLES,0,p_vertex_count);
 	}
@@ -370,77 +360,59 @@ void RasterizerCanvasGLES3::_draw_gui_primitive(int p_points, const Vector2 *p_v
 
 	//#define GLES_USE_PRIMITIVE_BUFFER
 
-#ifndef GLES_NO_CLIENT_ARRAYS
+	int version=0;
+	int color_ofs=0;
+	int uv_ofs=0;
+	int stride=2;
 
-	glEnableVertexAttribArray(VS::ARRAY_VERTEX);
-	glVertexAttribPointer( VS::ARRAY_VERTEX, 2 ,GL_FLOAT, false, sizeof(Vector2), p_vertices );
-
-	if (p_colors) {
-
-		glEnableVertexAttribArray(VS::ARRAY_COLOR);
-		glVertexAttribPointer( VS::ARRAY_COLOR, 4 ,GL_FLOAT, false, sizeof(Color), p_colors );
-	} else {
-		glDisableVertexAttribArray(VS::ARRAY_COLOR);
+	if (p_colors) { //color
+		version|=1;
+		color_ofs=stride;
+		stride+=4;
 	}
 
-	if (p_uvs) {
-
-		glEnableVertexAttribArray(VS::ARRAY_TEX_UV);
-		glVertexAttribPointer( VS::ARRAY_TEX_UV, 2 ,GL_FLOAT, false, sizeof(Vector2), p_uvs );
-	} else {
-		glDisableVertexAttribArray(VS::ARRAY_TEX_UV);
+	if (p_uvs) { //uv
+		version|=2;
+		uv_ofs=stride;
+		stride+=2;
 	}
 
-	glDrawArrays(prim[p_points],0,p_points);
 
-#else
+	float b[(2+2+4)];
+
 
-	glBindBuffer(GL_ARRAY_BUFFER,gui_quad_buffer);
-	float b[32];
-	int ofs=0;
-	glEnableVertexAttribArray(VS::ARRAY_VERTEX);
-	glVertexAttribPointer( VS::ARRAY_VERTEX, 2 ,GL_FLOAT, false, sizeof(float)*2, ((float*)0)+ofs );
 	for(int i=0;i<p_points;i++) {
-		b[ofs++]=p_vertices[i].x;
-		b[ofs++]=p_vertices[i].y;
+		b[stride*i+0]=p_vertices[i].x;
+		b[stride*i+1]=p_vertices[i].y;
 	}
 
 	if (p_colors) {
 
-		glEnableVertexAttribArray(VS::ARRAY_COLOR);
-		glVertexAttribPointer( VS::ARRAY_COLOR, 4 ,GL_FLOAT, false, sizeof(float)*4, ((float*)0)+ofs );
 		for(int i=0;i<p_points;i++) {
-			b[ofs++]=p_colors[i].r;
-			b[ofs++]=p_colors[i].g;
-			b[ofs++]=p_colors[i].b;
-			b[ofs++]=p_colors[i].a;
+			b[stride*i+color_ofs+0]=p_colors[i].r;
+			b[stride*i+color_ofs+1]=p_colors[i].g;
+			b[stride*i+color_ofs+2]=p_colors[i].b;
+			b[stride*i+color_ofs+3]=p_colors[i].a;
 		}
 
-	} else {
-		glDisableVertexAttribArray(VS::ARRAY_COLOR);
 	}
 
-
 	if (p_uvs) {
 
-		glEnableVertexAttribArray(VS::ARRAY_TEX_UV);
-		glVertexAttribPointer( VS::ARRAY_TEX_UV, 2 ,GL_FLOAT, false, sizeof(float)*2, ((float*)0)+ofs );
 		for(int i=0;i<p_points;i++) {
-			b[ofs++]=p_uvs[i].x;
-			b[ofs++]=p_uvs[i].y;
+			b[stride*i+uv_ofs+0]=p_uvs[i].x;
+			b[stride*i+uv_ofs+1]=p_uvs[i].y;
 		}
 
-	} else {
-		glDisableVertexAttribArray(VS::ARRAY_TEX_UV);
 	}
 
-	glBufferSubData(GL_ARRAY_BUFFER,0,ofs*4,&b[0]);
+	glBindBuffer(GL_ARRAY_BUFFER,data.primitive_quad_buffer);
+	glBufferSubData(GL_ARRAY_BUFFER,0,p_points*stride*4,&b[0]);
+	glBindVertexArray(data.primitive_quad_buffer_arrays[version]);
 	glDrawArrays(prim[p_points],0,p_points);
+	glBindVertexArray(0);
 	glBindBuffer(GL_ARRAY_BUFFER,0);
 
-
-#endif
-
 	storage->frame.canvas_draw_commands++;
 }
 
@@ -471,14 +443,14 @@ void RasterizerCanvasGLES3::_canvas_item_render_commands(Item *p_item,Item *curr
 					Vector2(line->to.x,line->to.y)
 				};
 
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 				if (line->antialiased)
 					glEnable(GL_LINE_SMOOTH);
 #endif
-				glLineWidth(line->width);
+				//glLineWidth(line->width);
 				_draw_gui_primitive(2,verts,NULL,NULL);
 
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 				if (line->antialiased)
 					glDisable(GL_LINE_SMOOTH);
 #endif
@@ -1395,7 +1367,7 @@ void RasterizerCanvasGLES3::reset_canvas() {
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	}
 	//glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);
-	glLineWidth(1.0);
+	//glLineWidth(1.0);
 	glBindBuffer(GL_ARRAY_BUFFER,0);
 	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0);
 	for(int i=0;i<VS::ARRAY_MAX;i++) {
@@ -1482,9 +1454,53 @@ void RasterizerCanvasGLES3::initialize() {
 		glBindBuffer(GL_ARRAY_BUFFER,0); //unbind
 	}
 
+	{
+
+		glGenBuffers(1,&data.primitive_quad_buffer);
+		glBindBuffer(GL_ARRAY_BUFFER,data.primitive_quad_buffer);
+		glBufferData(GL_ARRAY_BUFFER,sizeof(float)*2+sizeof(float)*2+sizeof(float)*4,NULL,GL_DYNAMIC_DRAW); //allocate max size
+		glBindBuffer(GL_ARRAY_BUFFER,0);
+
 
-	store_transform(Transform(),state.canvas_item_ubo_data.projection_matrix);
+		for(int i=0;i<4;i++) {
+			glGenVertexArrays(1,&data.primitive_quad_buffer_arrays[i]);
+			glBindVertexArray(data.primitive_quad_buffer_arrays[i]);
+			glBindBuffer(GL_ARRAY_BUFFER,data.primitive_quad_buffer);
 
+			int uv_ofs=0;
+			int color_ofs=0;
+			int stride=2*4;
+
+			if (i&1) { //color
+				color_ofs=stride;
+				stride+=4*4;
+			}
+
+			if (i&2) { //uv
+				uv_ofs=stride;
+				stride+=2*4;
+			}
+
+
+			glEnableVertexAttribArray(VS::ARRAY_VERTEX);
+			glVertexAttribPointer(VS::ARRAY_VERTEX,2,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+0);
+
+			if (i&1) {
+				glEnableVertexAttribArray(VS::ARRAY_COLOR);
+				glVertexAttribPointer(VS::ARRAY_COLOR,4,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+color_ofs);
+			}
+
+			if (i&2) {
+				glEnableVertexAttribArray(VS::ARRAY_TEX_UV);
+				glVertexAttribPointer(VS::ARRAY_TEX_UV,2,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+uv_ofs);
+			}
+
+			glBindVertexArray(0);
+		}
+	}
+
+
+	store_transform(Transform(),state.canvas_item_ubo_data.projection_matrix);
 
 
 	glGenBuffers(1, &state.canvas_item_ubo);
diff --git a/drivers/gles3/rasterizer_canvas_gles3.h b/drivers/gles3/rasterizer_canvas_gles3.h
index 8f34f07d06..670310068c 100644
--- a/drivers/gles3/rasterizer_canvas_gles3.h
+++ b/drivers/gles3/rasterizer_canvas_gles3.h
@@ -21,6 +21,9 @@ public:
 		GLuint canvas_quad_vertices;
 		GLuint canvas_quad_array;
 
+		GLuint primitive_quad_buffer;
+		GLuint primitive_quad_buffer_arrays[4];
+
 	} data;
 
 	struct State {
diff --git a/drivers/gles3/rasterizer_gles3.cpp b/drivers/gles3/rasterizer_gles3.cpp
index 84fa349313..ebcedd5f05 100644
--- a/drivers/gles3/rasterizer_gles3.cpp
+++ b/drivers/gles3/rasterizer_gles3.cpp
@@ -18,46 +18,69 @@ RasterizerScene *RasterizerGLES3::get_scene() {
 	return scene;
 }
 
+#define _EXT_DEBUG_OUTPUT_SYNCHRONOUS_ARB 0x8242
+#define _EXT_DEBUG_NEXT_LOGGED_MESSAGE_LENGTH_ARB 0x8243
+#define _EXT_DEBUG_CALLBACK_FUNCTION_ARB 0x8244
+#define _EXT_DEBUG_CALLBACK_USER_PARAM_ARB 0x8245
+#define _EXT_DEBUG_SOURCE_API_ARB 0x8246
+#define _EXT_DEBUG_SOURCE_WINDOW_SYSTEM_ARB 0x8247
+#define _EXT_DEBUG_SOURCE_SHADER_COMPILER_ARB 0x8248
+#define _EXT_DEBUG_SOURCE_THIRD_PARTY_ARB 0x8249
+#define _EXT_DEBUG_SOURCE_APPLICATION_ARB 0x824A
+#define _EXT_DEBUG_SOURCE_OTHER_ARB 0x824B
+#define _EXT_DEBUG_TYPE_ERROR_ARB 0x824C
+#define _EXT_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB 0x824D
+#define _EXT_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB 0x824E
+#define _EXT_DEBUG_TYPE_PORTABILITY_ARB 0x824F
+#define _EXT_DEBUG_TYPE_PERFORMANCE_ARB 0x8250
+#define _EXT_DEBUG_TYPE_OTHER_ARB 0x8251
+#define _EXT_MAX_DEBUG_MESSAGE_LENGTH_ARB 0x9143
+#define _EXT_MAX_DEBUG_LOGGED_MESSAGES_ARB 0x9144
+#define _EXT_DEBUG_LOGGED_MESSAGES_ARB 0x9145
+#define _EXT_DEBUG_SEVERITY_HIGH_ARB 0x9146
+#define _EXT_DEBUG_SEVERITY_MEDIUM_ARB 0x9147
+#define _EXT_DEBUG_SEVERITY_LOW_ARB 0x9148
+#define _EXT_DEBUG_OUTPUT 0x92E0
 
 static void _gl_debug_print(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const GLvoid *userParam)
 {
 
-	if (type==GL_DEBUG_TYPE_OTHER_ARB)
+	if (type==_EXT_DEBUG_TYPE_OTHER_ARB)
 		return;
 
 	print_line("mesege");
 	char debSource[256], debType[256], debSev[256];
-    if(source == GL_DEBUG_SOURCE_API_ARB)
+    if(source == _EXT_DEBUG_SOURCE_API_ARB)
 	strcpy(debSource, "OpenGL");
-    else if(source == GL_DEBUG_SOURCE_WINDOW_SYSTEM_ARB)
+    else if(source == _EXT_DEBUG_SOURCE_WINDOW_SYSTEM_ARB)
 	strcpy(debSource, "Windows");
-    else if(source == GL_DEBUG_SOURCE_SHADER_COMPILER_ARB)
+    else if(source == _EXT_DEBUG_SOURCE_SHADER_COMPILER_ARB)
 	strcpy(debSource, "Shader Compiler");
-    else if(source == GL_DEBUG_SOURCE_THIRD_PARTY_ARB)
+    else if(source == _EXT_DEBUG_SOURCE_THIRD_PARTY_ARB)
 	strcpy(debSource, "Third Party");
-    else if(source == GL_DEBUG_SOURCE_APPLICATION_ARB)
+    else if(source == _EXT_DEBUG_SOURCE_APPLICATION_ARB)
 	strcpy(debSource, "Application");
-    else if(source == GL_DEBUG_SOURCE_OTHER_ARB)
+    else if(source == _EXT_DEBUG_SOURCE_OTHER_ARB)
 	strcpy(debSource, "Other");
 
-    if(type == GL_DEBUG_TYPE_ERROR_ARB)
+    if(type == _EXT_DEBUG_TYPE_ERROR_ARB)
 	strcpy(debType, "Error");
-    else if(type == GL_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB)
+    else if(type == _EXT_DEBUG_TYPE_DEPRECATED_BEHAVIOR_ARB)
 	strcpy(debType, "Deprecated behavior");
-    else if(type == GL_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB)
+    else if(type == _EXT_DEBUG_TYPE_UNDEFINED_BEHAVIOR_ARB)
 	strcpy(debType, "Undefined behavior");
-    else if(type == GL_DEBUG_TYPE_PORTABILITY_ARB)
+    else if(type == _EXT_DEBUG_TYPE_PORTABILITY_ARB)
 	strcpy(debType, "Portability");
-    else if(type == GL_DEBUG_TYPE_PERFORMANCE_ARB)
+    else if(type == _EXT_DEBUG_TYPE_PERFORMANCE_ARB)
 	strcpy(debType, "Performance");
-    else if(type == GL_DEBUG_TYPE_OTHER_ARB)
+    else if(type == _EXT_DEBUG_TYPE_OTHER_ARB)
 	strcpy(debType, "Other");
 
-    if(severity == GL_DEBUG_SEVERITY_HIGH_ARB)
+    if(severity == _EXT_DEBUG_SEVERITY_HIGH_ARB)
 	strcpy(debSev, "High");
-    else if(severity == GL_DEBUG_SEVERITY_MEDIUM_ARB)
+    else if(severity == _EXT_DEBUG_SEVERITY_MEDIUM_ARB)
 	strcpy(debSev, "Medium");
-    else if(severity == GL_DEBUG_SEVERITY_LOW_ARB)
+    else if(severity == _EXT_DEBUG_SEVERITY_LOW_ARB)
 	strcpy(debSev, "Low");
 
 	String output = String()+ "GL ERROR: Source: " + debSource + "\tType: " + debType + "\tID: " + itos(id) + "\tSeverity: " + debSev + "\tMessage: " + message;
@@ -67,6 +90,16 @@ static void _gl_debug_print(GLenum source,GLenum type,GLuint id,GLenum severity,
 }
 
 
+typedef void (*DEBUGPROCARB)(GLenum source,
+					     GLenum type,
+					     GLuint id,
+					     GLenum severity,
+					     GLsizei length,
+					     const char* message,
+					     const void* userParam);
+
+typedef void (* DebugMessageCallbackARB) (DEBUGPROCARB callback, const void *userParam);
+
 void RasterizerGLES3::initialize() {
 
 	if (OS::get_singleton()->is_stdout_verbose()) {
@@ -91,9 +124,17 @@ void RasterizerGLES3::initialize() {
 	}
 #endif
 
-	glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB);
+#ifdef GLAD_ENABLED
+
+	if(!gladLoadGL()) {
+		ERR_PRINT("Error initializing GLAD");
+	}
+
+	glEnable(_EXT_DEBUG_OUTPUT_SYNCHRONOUS_ARB);
 	glDebugMessageCallbackARB(_gl_debug_print, NULL);
-	glEnable(GL_DEBUG_OUTPUT);
+	glEnable(_EXT_DEBUG_OUTPUT);
+
+#endif
 
 
 /*	glDebugMessageControlARB(GL_DEBUG_SOURCE_API_ARB,GL_DEBUG_TYPE_ERROR_ARB,GL_DEBUG_SEVERITY_HIGH_ARB,0,NULL,GL_TRUE);
diff --git a/drivers/gles3/rasterizer_scene_gles3.cpp b/drivers/gles3/rasterizer_scene_gles3.cpp
index 54dc3b914b..f42eea45d4 100644
--- a/drivers/gles3/rasterizer_scene_gles3.cpp
+++ b/drivers/gles3/rasterizer_scene_gles3.cpp
@@ -934,7 +934,7 @@ bool RasterizerSceneGLES3::_setup_material(RasterizerStorageGLES3::Material* p_m
 	}
 
 	if (state.current_line_width!=p_material->line_width) {
-		glLineWidth(p_material->line_width);
+		//glLineWidth(MAX(p_material->line_width,1.0));
 		state.current_line_width=p_material->line_width;
 	}
 
@@ -1109,17 +1109,17 @@ void RasterizerSceneGLES3::_setup_geometry(RenderList::Element *e) {
 			int stride = (multi_mesh->xform_floats+multi_mesh->color_floats)*4;
 			glEnableVertexAttribArray(8);
 			glVertexAttribPointer(8,4,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+0);
-			glVertexAttribDivisorARB(8,1);
+			glVertexAttribDivisor(8,1);
 			glEnableVertexAttribArray(9);
 			glVertexAttribPointer(9,4,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+4*4);
-			glVertexAttribDivisorARB(9,1);
+			glVertexAttribDivisor(9,1);
 
 			int color_ofs;
 
 			if (multi_mesh->transform_format==VS::MULTIMESH_TRANSFORM_3D) {
 				glEnableVertexAttribArray(10);
 				glVertexAttribPointer(10,4,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+8*4);
-				glVertexAttribDivisorARB(10,1);
+				glVertexAttribDivisor(10,1);
 				color_ofs=12*4;
 			} else {
 				glDisableVertexAttribArray(10);
@@ -1136,13 +1136,13 @@ void RasterizerSceneGLES3::_setup_geometry(RenderList::Element *e) {
 				case VS::MULTIMESH_COLOR_8BIT: {
 					glEnableVertexAttribArray(11);
 					glVertexAttribPointer(11,4,GL_UNSIGNED_BYTE,GL_TRUE,stride,((uint8_t*)NULL)+color_ofs);
-					glVertexAttribDivisorARB(11,1);
+					glVertexAttribDivisor(11,1);
 
 				} break;
 				case VS::MULTIMESH_COLOR_FLOAT: {
 					glEnableVertexAttribArray(11);
 					glVertexAttribPointer(11,4,GL_FLOAT,GL_FALSE,stride,((uint8_t*)NULL)+color_ofs);
-					glVertexAttribDivisorARB(11,1);
+					glVertexAttribDivisor(11,1);
 				} break;
 			}
 
@@ -1191,11 +1191,11 @@ void RasterizerSceneGLES3::_render_geometry(RenderList::Element *e) {
 
 			if (s->index_array_len>0) {
 
-				glDrawElementsInstancedARB(gl_primitive[s->primitive],s->index_array_len, (s->array_len>=(1<<16))?GL_UNSIGNED_INT:GL_UNSIGNED_SHORT,0,amount);
+				glDrawElementsInstanced(gl_primitive[s->primitive],s->index_array_len, (s->array_len>=(1<<16))?GL_UNSIGNED_INT:GL_UNSIGNED_SHORT,0,amount);
 
 			} else {
 
-				glDrawArraysInstancedARB(gl_primitive[s->primitive],0,s->array_len,amount);
+				glDrawArraysInstanced(gl_primitive[s->primitive],0,s->array_len,amount);
 
 			}
 
@@ -3648,10 +3648,9 @@ void RasterizerSceneGLES3::initialize() {
 	}
 
 
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 //"desktop" opengl needs this.
-	glEnable(GL_POINT_SPRITE);
-	glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
+	glEnable(GL_PROGRAM_POINT_SIZE);
 
 #endif
 }
diff --git a/drivers/gles3/rasterizer_storage_gles3.cpp b/drivers/gles3/rasterizer_storage_gles3.cpp
index e5a0cded8e..60cbbc9023 100644
--- a/drivers/gles3/rasterizer_storage_gles3.cpp
+++ b/drivers/gles3/rasterizer_storage_gles3.cpp
@@ -62,7 +62,21 @@
 #define _GL_TEXTURE_MAX_ANISOTROPY_EXT          0x84FE
 #define _GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT      0x84FF
 
-
+#define _EXT_COMPRESSED_R11_EAC 0x9270
+#define _EXT_COMPRESSED_SIGNED_R11_EAC 0x9271
+#define _EXT_COMPRESSED_RG11_EAC 0x9272
+#define _EXT_COMPRESSED_SIGNED_RG11_EAC 0x9273
+#define _EXT_COMPRESSED_RGB8_ETC2 0x9274
+#define _EXT_COMPRESSED_SRGB8_ETC2 0x9275
+#define _EXT_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9276
+#define _EXT_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9277
+#define _EXT_COMPRESSED_RGBA8_ETC2_EAC 0x9278
+#define _EXT_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC 0x9279
+
+#define _EXT_COMPRESSED_RGBA_BPTC_UNORM 0x8E8C
+#define _EXT_COMPRESSED_SRGB_ALPHA_BPTC_UNORM 0x8E8D
+#define _EXT_COMPRESSED_RGB_BPTC_SIGNED_FLOAT 0x8E8E
+#define _EXT_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT 0x8E8F
 
 Image RasterizerStorageGLES3::_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,GLenum &r_gl_type,bool &r_compressed,bool &srgb) {
 
@@ -77,17 +91,16 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 	switch(p_format) {
 
 		case Image::FORMAT_L8: {
-			r_gl_internal_format=GL_LUMINANCE;
-			r_gl_format=GL_LUMINANCE;
+			r_gl_internal_format=GL_R8;
+			r_gl_format=GL_RED;
 			r_gl_type=GL_UNSIGNED_BYTE;
 
 		} break;
 		case Image::FORMAT_LA8: {
 
-			r_gl_internal_format=GL_LUMINANCE_ALPHA;
-			r_gl_format=GL_LUMINANCE_ALPHA;
+			r_gl_internal_format=GL_RG8;
+			r_gl_format=GL_RG;
 			r_gl_type=GL_UNSIGNED_BYTE;
-
 		} break;
 		case Image::FORMAT_R8: {
 
@@ -120,8 +133,9 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 		} break;
 		case Image::FORMAT_RGB565: {
-
-			r_gl_internal_format=GL_RGB565;
+#warning TODO: Convert tod 555 if 565 is not supported (GLES3.3-)
+			r_gl_internal_format=GL_RGB5;
+			//r_gl_internal_format=GL_RGB565;
 			r_gl_format=GL_RGB;
 			r_gl_type=GL_UNSIGNED_SHORT_5_6_5;
 
@@ -287,7 +301,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 			if (config.bptc_supported) {
 
 
-				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM:GL_COMPRESSED_RGBA_BPTC_UNORM;
+				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?_EXT_COMPRESSED_SRGB_ALPHA_BPTC_UNORM:_EXT_COMPRESSED_RGBA_BPTC_UNORM;
 				r_gl_format=GL_RGBA;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -303,7 +317,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 			if (config.bptc_supported) {
 
 
-				r_gl_internal_format=GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT;
+				r_gl_internal_format=_EXT_COMPRESSED_RGB_BPTC_SIGNED_FLOAT;
 				r_gl_format=GL_RGB;
 				r_gl_type=GL_FLOAT;
 				r_compressed=true;
@@ -316,7 +330,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 			if (config.bptc_supported) {
 
 
-				r_gl_internal_format=GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT;
+				r_gl_internal_format=_EXT_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT;
 				r_gl_format=GL_RGB;
 				r_gl_type=GL_FLOAT;
 				r_compressed=true;
@@ -413,7 +427,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=GL_COMPRESSED_R11_EAC;
+				r_gl_internal_format=_EXT_COMPRESSED_R11_EAC;
 				r_gl_format=GL_RED;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -427,7 +441,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=GL_COMPRESSED_SIGNED_R11_EAC;
+				r_gl_internal_format=_EXT_COMPRESSED_SIGNED_R11_EAC;
 				r_gl_format=GL_RED;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -441,7 +455,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=GL_COMPRESSED_RG11_EAC;
+				r_gl_internal_format=_EXT_COMPRESSED_RG11_EAC;
 				r_gl_format=GL_RG;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -454,7 +468,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 		case Image::FORMAT_ETC2_RG11S: {
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=GL_COMPRESSED_SIGNED_RG11_EAC;
+				r_gl_internal_format=_EXT_COMPRESSED_SIGNED_RG11_EAC;
 				r_gl_format=GL_RG;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -467,7 +481,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?GL_COMPRESSED_SRGB8_ETC2:GL_COMPRESSED_RGB8_ETC2;
+				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?_EXT_COMPRESSED_SRGB8_ETC2:_EXT_COMPRESSED_RGB8_ETC2;
 				r_gl_format=GL_RGB;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -483,7 +497,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:GL_COMPRESSED_RGBA8_ETC2_EAC;
+				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?_EXT_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:_EXT_COMPRESSED_RGBA8_ETC2_EAC;
 				r_gl_format=GL_RGBA;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -499,7 +513,7 @@ Image RasterizerStorageGLES3::_get_gl_image_and_format(const Image& p_image, Ima
 
 			if (config.etc2_supported) {
 
-				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2;
+				r_gl_internal_format=(config.srgb_decode_supported || p_flags&VS::TEXTURE_FLAG_CONVERT_TO_LINEAR)?_EXT_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:_EXT_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2;
 				r_gl_format=GL_RGBA;
 				r_gl_type=GL_UNSIGNED_BYTE;
 				r_compressed=true;
@@ -709,6 +723,32 @@ void RasterizerStorageGLES3::texture_set_data(RID p_texture,const Image& p_image
 		glTexParameterf( texture->target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
 	}
 
+	//set swizle for older format compatibility
+	switch(texture->format) {
+
+		case Image::FORMAT_L8: {
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_R,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_G,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_B,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_A,GL_ONE);
+
+		} break;
+		case Image::FORMAT_LA8: {
+
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_R,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_G,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_B,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_A,GL_GREEN);
+		} break;
+		default: {
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_R,GL_RED);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_G,GL_GREEN);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_B,GL_BLUE);
+			glTexParameteri(texture->target,GL_TEXTURE_SWIZZLE_A,GL_ALPHA);
+
+		} break;
+
+	}
 	if (config.use_anisotropic_filter) {
 
 		if (texture->flags&VS::TEXTURE_FLAG_ANISOTROPIC_FILTER) {
@@ -782,7 +822,7 @@ Image RasterizerStorageGLES3::texture_get_data(RID p_texture,VS::CubeMapSide p_c
 	ERR_FAIL_COND_V(texture->data_size==0,Image());
 	ERR_FAIL_COND_V(texture->render_target,Image());
 
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 
 	DVector<uint8_t> data;
 
@@ -5068,9 +5108,14 @@ void RasterizerStorageGLES3::initialize() {
 	///
 
 	{
-		Vector<String> ext= String((const char*)glGetString( GL_EXTENSIONS )).split(" ",false);
-		for(int i=0;i<ext.size();i++) {
-			config.extensions.insert(ext[i]);
+
+		int max_extensions=0;
+		glGetIntegerv(GL_NUM_EXTENSIONS,&max_extensions);
+		for(int i=0;i<max_extensions;i++) {
+			const GLubyte *s = glGetStringi( GL_EXTENSIONS,i );
+			if (!s)
+				break;
+			config.extensions.insert((const char*)s);
 		}
 	}
 
@@ -5082,7 +5127,7 @@ void RasterizerStorageGLES3::initialize() {
 	config.etc_supported=config.extensions.has("GL_OES_compressed_ETC1_RGB8_texture");
 	config.latc_supported=config.extensions.has("GL_EXT_texture_compression_latc");
 	config.bptc_supported=config.extensions.has("GL_ARB_texture_compression_bptc");
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 	config.etc2_supported=false;
 #else
 	config.etc2_supported=true;
@@ -5166,7 +5211,7 @@ void RasterizerStorageGLES3::initialize() {
 	glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS,&config.max_texture_image_units);
 	glGetIntegerv(GL_MAX_TEXTURE_SIZE,&config.max_texture_size);
 
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 	config.use_rgba_2d_shadows=false;
 #else
 	config.use_rgba_2d_shadows=true;
diff --git a/drivers/gles3/shader_gles3.cpp b/drivers/gles3/shader_gles3.cpp
index 6f0616035a..0a25f6c3b3 100644
--- a/drivers/gles3/shader_gles3.cpp
+++ b/drivers/gles3/shader_gles3.cpp
@@ -220,7 +220,7 @@ ShaderGLES3::Version* ShaderGLES3::get_current_version() {
 	/* SETUP CONDITIONALS */
 	
 	Vector<const char*> strings;
-#ifdef GLEW_ENABLED
+#ifdef GLES_OVER_GL
 	//strings.push_back("#version 330\n");
 	strings.push_back("#version 300 es\n");
 #else
@@ -709,6 +709,8 @@ void ShaderGLES3::setup(const char** p_conditional_defines, int p_conditional_co
 		}
 	}
 
+	glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS,&max_image_units);
+
 }
 
 void ShaderGLES3::finish() {
@@ -804,7 +806,7 @@ ShaderGLES3::ShaderGLES3() {
 	last_custom_code=1;
 	uniforms_dirty = true;
 	base_material_tex_index=0;
-	glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS,&max_image_units);
+
 }
 
 
-- 
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