Replace the previous OpenGL loader with a glad-generated 3.3 one

The main advantage of switching to glad from glLoadGen is that, apart
from being actively maintained, it supports a customizable entrypoint
loader function, which makes it possible to also support OpenGL ES.

CMakeLists.txt

@@ -213,6 +213,7 @@ set(INI_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}/externals/inih")
 include_directories(${INI_PREFIX})
 add_subdirectory(${INI_PREFIX})
 
+add_subdirectory(externals/glad)
 include_directories(externals/microprofile)
 include_directories(externals/nihstro/include)
 

externals/glad/CMakeLists.txt

@@ -0,0 +1,11 @@
+set(SRCS
+            src/glad.c
+            )
+set(HEADERS
+            include/KHR/khrplatform.h
+            include/glad/glad.h
+            )
+
+create_directory_groups(${SRCS} ${HEADERS})
+add_library(glad STATIC ${SRCS} ${HEADERS})
+target_include_directories(glad PUBLIC "include/")

externals/glad/Readme.md

@@ -0,0 +1,5 @@
+These files were generated by the [glad](https://github.com/Dav1dde/glad) OpenGL loader generator and have been checked in as-is. You can re-generate them using glad with the following command:
+
+```
+python -m glad --profile core --out-path glad/ --api gl=3.3,gles=3.0
+```

externals/glad/include/KHR/khrplatform.h

@@ -0,0 +1,282 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2009 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * $Revision: 23298 $ on $Date: 2013-09-30 17:07:13 -0700 (Mon, 30 Sep 2013) $
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by sending them to the public Khronos Bugzilla
+ * (http://khronos.org/bugzilla) by filing a bug against product
+ * "Khronos (general)" component "Registry".
+ *
+ * A predefined template which fills in some of the bug fields can be
+ * reached using http://tinyurl.com/khrplatform-h-bugreport, but you
+ * must create a Bugzilla login first.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(_WIN32) && !defined(__SCITECH_SNAP__)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64, 
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef _WIN64
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

src/citra/CMakeLists.txt

@@ -15,7 +15,7 @@ create_directory_groups(${SRCS} ${HEADERS})
 
 add_executable(citra ${SRCS} ${HEADERS})
 target_link_libraries(citra core video_core common)
-target_link_libraries(citra ${GLFW_LIBRARIES} ${OPENGL_gl_LIBRARY} inih)
+target_link_libraries(citra ${GLFW_LIBRARIES} ${OPENGL_gl_LIBRARY} inih glad)
 if (MSVC)
     target_link_libraries(citra getopt)
 endif()

src/citra/emu_window/emu_window_glfw.cpp

@@ -7,7 +7,7 @@
 #include <string>
 
 // Let’s use our own GL header, instead of one from GLFW.
-#include "video_core/renderer_opengl/generated/gl_3_2_core.h"
+#include <glad/glad.h>
 #define GLFW_INCLUDE_NONE
 #include <GLFW/glfw3.h>
 

src/video_core/CMakeLists.txt

@@ -1,5 +1,4 @@
 set(SRCS
-            renderer_opengl/generated/gl_3_2_core.c
             renderer_opengl/gl_rasterizer.cpp
             renderer_opengl/gl_rasterizer_cache.cpp
             renderer_opengl/gl_shader_util.cpp
@@ -19,7 +18,6 @@ set(SRCS
 
 set(HEADERS
             debug_utils/debug_utils.h
-            renderer_opengl/generated/gl_3_2_core.h
             renderer_opengl/gl_rasterizer.h
             renderer_opengl/gl_rasterizer_cache.h
             renderer_opengl/gl_resource_manager.h
@@ -53,6 +51,7 @@ endif()
 create_directory_groups(${SRCS} ${HEADERS})
 
 add_library(video_core STATIC ${SRCS} ${HEADERS})
+target_link_libraries(video_core glad)
 
 if (PNG_FOUND)
     target_link_libraries(video_core ${PNG_LIBRARIES})

src/video_core/renderer_opengl/generated/Readme.md

@@ -1,5 +0,0 @@
-These file were generated by the [glLoadGen](https://bitbucket.org/alfonse/glloadgen/wiki/Home) OpenGL loader generator and have been checked in as-is. You can re-generate them using version 2.0.2 of glLoadGen and executing the following command:
-
-```
-lua LoadGen.lua -version 3.2 -profile core -indent space 3_2_core
-```

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -5,6 +5,8 @@
 #include <cstring>
 #include <memory>
 
+#include <glad/glad.h>
+
 #include "common/color.h"
 #include "common/math_util.h"
 #include "common/microprofile.h"
@@ -21,8 +23,6 @@
 #include "video_core/renderer_opengl/gl_shader_util.h"
 #include "video_core/renderer_opengl/pica_to_gl.h"
 
-#include "generated/gl_3_2_core.h"
-
 static bool IsPassThroughTevStage(const Pica::Regs::TevStageConfig& stage) {
     return (stage.color_op == Pica::Regs::TevStageConfig::Operation::Replace &&
             stage.alpha_op == Pica::Regs::TevStageConfig::Operation::Replace &&

src/video_core/renderer_opengl/gl_resource_manager.h

@@ -6,9 +6,10 @@
 
 #include <utility>
 
+#include <glad/glad.h>
+
 #include "common/common_types.h"
 
-#include "video_core/renderer_opengl/generated/gl_3_2_core.h"
 #include "video_core/renderer_opengl/gl_shader_util.h"
 #include "video_core/renderer_opengl/gl_state.h"
 

src/video_core/renderer_opengl/gl_shader_util.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include "generated/gl_3_2_core.h"
+#include <glad/glad.h>
 
 namespace ShaderUtil {
 

src/video_core/renderer_opengl/gl_state.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include "generated/gl_3_2_core.h"
+#include <glad/glad.h>
 
 class OpenGLState {
 public:

src/video_core/renderer_opengl/pica_to_gl.h

@@ -4,12 +4,12 @@
 
 #pragma once
 
+#include <glad/glad.h>
+
 #include "common/common_types.h"
 
 #include "video_core/pica.h"
 
-#include "generated/gl_3_2_core.h"
-
 namespace PicaToGL {
 
 inline GLenum TextureFilterMode(Pica::Regs::TextureConfig::TextureFilter mode) {

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -373,8 +373,8 @@ void RendererOpenGL::SetWindow(EmuWindow* window) {
 void RendererOpenGL::Init() {
     render_window->MakeCurrent();
 
-    int err = ogl_LoadFunctions();
+    // TODO: Make frontends initialize this, so they can use gladLoadGLLoader with their own loaders
-    if (ogl_LOAD_SUCCEEDED != err) {
+    if (!gladLoadGL()) {
         LOG_CRITICAL(Render_OpenGL, "Failed to initialize GL functions! Exiting...");
         exit(-1);
     }

src/video_core/renderer_opengl/renderer_opengl.h

@@ -6,7 +6,7 @@
 
 #include <array>
 
-#include "generated/gl_3_2_core.h"
+#include <glad/glad.h>
 
 #include "common/math_util.h"