overlaytopleft/games-fps/gzdoom/files/0033-Fixing-GLES-mode-to-work-on-real-GLES-hardware-and-O.patch

From adcb59e00e3f5a4e623be4b0b629b4bd8dfe933f Mon Sep 17 00:00:00 2001
From: Emile Belanger <emile.belanger@gmail.com>
Date: Sat, 4 Feb 2023 22:20:05 +0000
Subject: [PATCH 33/51] Fixing GLES mode to work on real GLES hardware and
 OpenGL 2 again

---
 src/common/rendering/gles/gles_buffers.cpp    |  10 +-
 src/common/rendering/gles/gles_hwtexture.cpp  |  59 +++----
 .../rendering/gles/gles_renderstate.cpp       |   2 +-
 src/common/rendering/gles/gles_system.cpp     | 153 +++++++++++-------
 src/common/rendering/gles/gles_system.h       |  70 +++++---
 5 files changed, 172 insertions(+), 122 deletions(-)

diff --git a/src/common/rendering/gles/gles_buffers.cpp b/src/common/rendering/gles/gles_buffers.cpp
index cf7b8ae97..7f56f737f 100644
--- a/src/common/rendering/gles/gles_buffers.cpp
+++ b/src/common/rendering/gles/gles_buffers.cpp
@@ -234,8 +234,7 @@ void GLBuffer::Resize(size_t newsize)
 
 void GLBuffer::GPUDropSync()
 {
-#if !(USE_GLES2)  // Only applicable when running on desktop for now
-	if (gles.useMappedBuffers && glFenceSync && glClientWaitSync)
+	if (gles.glesMode > GLES_MODE_GLES && gles.useMappedBuffers && glFenceSync && glDeleteSync)
 	{
 		if (mGLSync != NULL)
 		{
@@ -244,13 +243,11 @@ void GLBuffer::GPUDropSync()
 
 		mGLSync = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
 	}
-#endif
 }
 
 void GLBuffer::GPUWaitSync()
 {
-#if !(USE_GLES2)  // Only applicable when running on desktop for now
-	if (gles.useMappedBuffers && glFenceSync && glClientWaitSync)
+	if (gles.glesMode > GLES_MODE_GLES && gles.useMappedBuffers && glDeleteSync && glClientWaitSync)
 	{
 		GLenum status = glClientWaitSync(mGLSync, GL_SYNC_FLUSH_COMMANDS_BIT, 1000 * 1000 * 50); // Wait for a max of 50ms...
 
@@ -263,7 +260,6 @@ void GLBuffer::GPUWaitSync()
 
 		mGLSync = NULL;
 	}
-#endif
 }
 
 
@@ -318,7 +314,7 @@ void GLVertexBuffer::Bind(int *offsets)
 				glVertexAttribPointer(i, attrinf.size, attrinf.format, attrinf.normalize, (GLsizei)mStride, (void*)(intptr_t)ofs);
 			else
 			{
-				if (gles.gles3Features)
+				if (gles.glesMode >= GLES_MODE_OGL3)
 					glVertexAttribIPointer(i, attrinf.size, attrinf.format, (GLsizei)mStride, (void*)(intptr_t)ofs);
 			}
 		}
diff --git a/src/common/rendering/gles/gles_hwtexture.cpp b/src/common/rendering/gles/gles_hwtexture.cpp
index 43425ce7d..3f07c65d6 100644
--- a/src/common/rendering/gles/gles_hwtexture.cpp
+++ b/src/common/rendering/gles/gles_hwtexture.cpp
@@ -130,44 +130,47 @@ unsigned int FHardwareTexture::CreateTexture(unsigned char * buffer, int w, int
 
 	int sourcetype;
 
-
-#if USE_GLES2
-	if (glTextureBytes == 1)
+	if (gles.glesMode == GLES_MODE_GLES)
 	{
-		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-		sourcetype = GL_ALPHA;
-		texformat = GL_ALPHA;
-	}
-	else
-	{
-		sourcetype = GL_BGRA;
-		texformat = GL_BGRA;
-	}
-#else
-	if (glTextureBytes == 1)
-	{
-		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-		sourcetype = GL_RED;
-		texformat = GL_RED;
+		if (glTextureBytes == 1)
+		{
+			glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+			sourcetype = GL_ALPHA;
+			texformat = GL_ALPHA;
+		}
+		else
+		{
+			sourcetype = GL_BGRA; // These two must be the same
+			texformat = GL_BGRA;
+		}
 	}
 	else
 	{
-		sourcetype = GL_BGRA;
-		texformat = GL_RGBA;
+		if (glTextureBytes == 1) //Use Red channel instread becuase Alpha does not work in OpenGL, swizzle later
+		{
+			glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+			sourcetype = GL_RED;
+			texformat = GL_RED;
+		}
+		else
+		{
+			sourcetype = GL_BGRA;
+			texformat = GL_RGBA;
+		}
 	}
-#endif
 
 	glTexImage2D(GL_TEXTURE_2D, 0, texformat, rw, rh, 0, sourcetype, GL_UNSIGNED_BYTE, buffer);
 
-#if !(USE_GLES2)
-	// The shader is using the alpha channel instead of red, this work on GLES but not on GL
-	// So the texture uses GL_RED and this swizzels the red channel into the alpha channel
-	if (glTextureBytes == 1)
+	if (gles.glesMode != GLES_MODE_GLES)
 	{
-		GLint swizzleMask[] = { GL_ZERO, GL_ZERO, GL_ZERO, GL_RED };
-		glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
+		// The shader is using the alpha channel instead of red, this work on GLES but not on GL
+		// So the texture uses GL_RED and this swizzels the red channel into the alpha channel
+		if (glTextureBytes == 1)
+		{
+			GLint swizzleMask[] = { GL_ZERO, GL_ZERO, GL_ZERO, GL_RED };
+			glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
+		}
 	}
-#endif
 
 	if (deletebuffer && buffer) free(buffer);
 
diff --git a/src/common/rendering/gles/gles_renderstate.cpp b/src/common/rendering/gles/gles_renderstate.cpp
index 87cf2681e..5995fd3b6 100644
--- a/src/common/rendering/gles/gles_renderstate.cpp
+++ b/src/common/rendering/gles/gles_renderstate.cpp
@@ -346,7 +346,7 @@ bool FGLRenderState::ApplyShader()
 		activeShader->cur->muLightRange.Set(range);
 	}
 
-	if (gles.gles3Features)
+	if (gles.glesMode >= GLES_MODE_OGL3)
 	{
 		// Upload bone data
 		// NOTE, this is pretty inefficient, it will be reloading the same data over and over in a single frame
diff --git a/src/common/rendering/gles/gles_system.cpp b/src/common/rendering/gles/gles_system.cpp
index 22ba8cad6..bb7d61687 100644
--- a/src/common/rendering/gles/gles_system.cpp
+++ b/src/common/rendering/gles/gles_system.cpp
@@ -12,50 +12,16 @@ EXTERN_CVAR(Bool, gl_customshader);
 void setGlVersion(double glv);
 
 
-#if USE_GLES2
+#if USE_GLAD_LOADER
 
 PFNGLMAPBUFFERRANGEEXTPROC glMapBufferRange = NULL;
 PFNGLUNMAPBUFFEROESPROC glUnmapBuffer = NULL;
 PFNGLVERTEXATTRIBIPOINTERPROC glVertexAttribIPointer = NULL;
+PFNGLFENCESYNCPROC glFenceSync = NULL;
+PFNGLCLIENTWAITSYNCPROC glClientWaitSync = NULL;
+PFNGLDELETESYNCPROC glDeleteSync = NULL;
 
-#ifdef __ANDROID__
-#include <dlfcn.h>
-
-static void* LoadGLES2Proc(const char* name)
-{
-	static void *glesLib = NULL;
-
-	if(!glesLib)
-	{
-		int flags = RTLD_LOCAL | RTLD_NOW;
-
-		glesLib = dlopen("libGLESv2_CM.so", flags);
-		if(!glesLib)
-		{
-			glesLib = dlopen("libGLESv2.so", flags);
-		}
-		if(!glesLib)
-		{
-			glesLib = dlopen("libGLESv2.so.2", flags);
-		}
-	}
-
-	void * ret = NULL;
-	ret =  dlsym(glesLib, name);
-
-	if(!ret)
-	{
-		//LOGI("Failed to load: %s", name);
-	}
-	else
-	{
-		//LOGI("Loaded %s func OK", name);
-	}
-
-	return ret;
-}
-
-#elif defined _WIN32
+#if defined _WIN32
 
 #include <windows.h>
 
@@ -80,9 +46,38 @@ static void* LoadGLES2Proc(const char* name)
 	}
 }
 
+#else
+
+#include <dlfcn.h>
+
+static void* LoadGLES2Proc(const char* name)
+{
+	static void* glesLib = NULL;
+
+	if (!glesLib)
+	{
+		int flags = RTLD_LOCAL | RTLD_NOW;
+
+		glesLib = dlopen("libGLESv2_CM.so", flags);
+		if (!glesLib)
+		{
+			glesLib = dlopen("libGLESv2.so", flags);
+		}
+		if (!glesLib)
+		{
+			glesLib = dlopen("libGLESv2.so.2", flags);
+		}
+	}
+
+	void* ret = NULL;
+	ret = dlsym(glesLib, name);
+
+	return ret;
+}
+
 #endif
 
-#endif // USE_GLES2
+#endif // USE_GLAD_LOADER
 
 static TArray<FString>  m_Extensions;
 
@@ -126,7 +121,7 @@ namespace OpenGLESRenderer
 	void InitGLES()
 	{
 
-#if USE_GLES2
+#if USE_GLAD_LOADER
 
 		if (!gladLoadGLES2Loader(&LoadGLES2Proc))
 		{
@@ -136,6 +131,10 @@ namespace OpenGLESRenderer
 		glMapBufferRange = (PFNGLMAPBUFFERRANGEEXTPROC)LoadGLES2Proc("glMapBufferRange");
 		glUnmapBuffer = (PFNGLUNMAPBUFFEROESPROC)LoadGLES2Proc("glUnmapBuffer");
 		glVertexAttribIPointer = (PFNGLVERTEXATTRIBIPOINTERPROC)LoadGLES2Proc("glVertexAttribIPointer");
+
+		glFenceSync = (PFNGLFENCESYNCPROC)LoadGLES2Proc("glFenceSync");
+		glClientWaitSync = (PFNGLCLIENTWAITSYNCPROC)LoadGLES2Proc("glClientWaitSync");
+		glDeleteSync = (PFNGLDELETESYNCPROC)LoadGLES2Proc("glDeleteSync");
 #else
 		static bool first = true;
 
@@ -161,48 +160,78 @@ namespace OpenGLESRenderer
 		{
 			Printf(" %s\n", m_Extensions[i].GetChars());
 		}
+		const char* glVersionStr = (const char*)glGetString(GL_VERSION);
+		double glVersion = strtod(glVersionStr, NULL);
 
+		Printf("GL Version parsed = %f\n", glVersion);
 
 		gles.flags = RFL_NO_CLIP_PLANES;
 
 		gles.useMappedBuffers = gles_use_mapped_buffer;
 		gles.forceGLSLv100 = gles_force_glsl_v100;
 		gles.maxlights = gles_max_lights_per_surface;
+		gles.numlightvectors = (gles.maxlights * LIGHT_VEC4_NUM);
 
 		gles.modelstring = (char*)glGetString(GL_RENDERER);
 		gles.vendorstring = (char*)glGetString(GL_VENDOR);
 
-		gl_customshader = false;
+
+		gl_customshader = false; // Disable user shaders for GLES renderer
 
 		GLint maxTextureSize[1];
 		glGetIntegerv(GL_MAX_TEXTURE_SIZE, maxTextureSize);
-
 		gles.max_texturesize = maxTextureSize[0];
 
 		Printf("GL_MAX_TEXTURE_SIZE: %d\n", gles.max_texturesize);
 
-#if USE_GLES2
-		gles.gles3Features = false; // Enales IQM bones
-		gles.shaderVersionString = "100";
 
-		gles.depthStencilAvailable = CheckExtension("GL_OES_packed_depth_stencil");
-		gles.npotAvailable = CheckExtension("GL_OES_texture_npot");
-		gles.depthClampAvailable = CheckExtension("GL_EXT_depth_clamp");
-		gles.anistropicFilterAvailable = CheckExtension("GL_EXT_texture_filter_anisotropic");
-#else
-		gles.gles3Features = true;
-		gles.shaderVersionString = "330";
-		gles.depthStencilAvailable = true;
-		gles.npotAvailable = true;
-		gles.useMappedBuffers = true;
-		gles.depthClampAvailable = true;
-		gles.anistropicFilterAvailable = true;
-#endif
+		// Check if running on a GLES device, version string will start with 'OpenGL ES'
+		if (!strncmp(glVersionStr, "OpenGL ES", strlen("OpenGL ES")))
+		{
+			gles.glesMode = GLES_MODE_GLES;
+		}
+		else // Else runnning on Desktop, check OpenGL version is 3 or above
+		{
+			if (glVersion > 3.29)
+				gles.glesMode = GLES_MODE_OGL3; // 3.3 or above
+			else
+				gles.glesMode = GLES_MODE_OGL2; // Below 3.3
+		}
 
-		gles.numlightvectors = (gles.maxlights * LIGHT_VEC4_NUM);
 
-		const char* glversion = (const char*)glGetString(GL_VERSION);
-		setGlVersion( strtod(glversion, NULL));
+		if (gles.glesMode == GLES_MODE_GLES)
+		{
+			Printf("GLES choosing mode: GLES_MODE_GLES\n");
 
+			gles.shaderVersionString = "100";
+			gles.depthStencilAvailable = CheckExtension("GL_OES_packed_depth_stencil");
+			gles.npotAvailable = CheckExtension("GL_OES_texture_npot");
+			gles.depthClampAvailable = CheckExtension("GL_EXT_depth_clamp");
+			gles.anistropicFilterAvailable = CheckExtension("GL_EXT_texture_filter_anisotropic");
+		}
+		else if (gles.glesMode == GLES_MODE_OGL2)
+		{
+			Printf("GLES choosing mode: GLES_MODE_OGL2\n");
+
+			gles.shaderVersionString = "100";
+			gles.depthStencilAvailable = true;
+			gles.npotAvailable = true;
+			gles.useMappedBuffers = true;
+			gles.depthClampAvailable = true;
+			gles.anistropicFilterAvailable = true;
+		}
+		else if (gles.glesMode == GLES_MODE_OGL3)
+		{
+			Printf("GLES choosing mode: GLES_MODE_OGL3\n");
+
+			gles.shaderVersionString = "330";
+			gles.depthStencilAvailable = true;
+			gles.npotAvailable = true;
+			gles.useMappedBuffers = true;
+			gles.depthClampAvailable = true;
+			gles.anistropicFilterAvailable = true;
+		}
+		
+		setGlVersion(glVersion);
 	}
 }
diff --git a/src/common/rendering/gles/gles_system.h b/src/common/rendering/gles/gles_system.h
index 481c132d0..0edec6282 100644
--- a/src/common/rendering/gles/gles_system.h
+++ b/src/common/rendering/gles/gles_system.h
@@ -23,32 +23,47 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
-#define USE_GLES2 0 // For Desktop PC leave as 0, it will use the exisiting OpenGL context creationg code but run with the GLES2 renderer
-                    // Set to 1 for when comipling for a real GLES device
+#define USE_GLAD_LOADER 0 // Set to 1 to use the GLAD loader, otherwise use noramal GZDoom loader for PC
 
-#if (USE_GLES2)
+#if (USE_GLAD_LOADER)
 	#include "glad/glad.h"
 
-// Below are used extensions for GLES
-typedef void* (APIENTRYP PFNGLMAPBUFFERRANGEEXTPROC)(GLenum target, GLintptr offset, GLsizeiptr length, GLbitfield access);
-GLAPI PFNGLMAPBUFFERRANGEEXTPROC glMapBufferRange;
-
-typedef GLboolean(APIENTRYP PFNGLUNMAPBUFFEROESPROC)(GLenum target);
-GLAPI PFNGLUNMAPBUFFEROESPROC glUnmapBuffer;
-
-typedef void (APIENTRYP PFNGLVERTEXATTRIBIPOINTERPROC) (GLuint index, GLint size, GLenum type, GLsizei stride, const void* pointer);
-GLAPI PFNGLVERTEXATTRIBIPOINTERPROC glVertexAttribIPointer;
-
-#define GL_DEPTH24_STENCIL8               0x88F0
-#define GL_MAP_PERSISTENT_BIT             0x0040
-#define GL_MAP_READ_BIT                   0x0001
-#define GL_MAP_WRITE_BIT                  0x0002
-#define GL_MAP_UNSYNCHRONIZED_BIT         0x0020
-#define GL_MAP_INVALIDATE_BUFFER_BIT      0x0008
-#define GL_BGRA                           0x80E1
-#define GL_DEPTH_CLAMP                    0x864F
-#define GL_TEXTURE_MAX_ANISOTROPY_EXT     0x84FE
-#define GL_INT_2_10_10_10_REV             0x8D9F
+	// Below are used extensions for GLES
+	typedef void* (APIENTRYP PFNGLMAPBUFFERRANGEEXTPROC)(GLenum target, GLintptr offset, GLsizeiptr length, GLbitfield access);
+	GLAPI PFNGLMAPBUFFERRANGEEXTPROC glMapBufferRange;
+
+	typedef GLboolean(APIENTRYP PFNGLUNMAPBUFFEROESPROC)(GLenum target);
+	GLAPI PFNGLUNMAPBUFFEROESPROC glUnmapBuffer;
+
+	typedef void (APIENTRYP PFNGLVERTEXATTRIBIPOINTERPROC) (GLuint index, GLint size, GLenum type, GLsizei stride, const void* pointer);
+	GLAPI PFNGLVERTEXATTRIBIPOINTERPROC glVertexAttribIPointer;
+
+	typedef GLsync(APIENTRYP PFNGLFENCESYNCPROC)(GLenum condition, GLbitfield flags);
+	GLAPI PFNGLFENCESYNCPROC glFenceSync;
+	
+	typedef GLenum(APIENTRYP PFNGLCLIENTWAITSYNCPROC)(GLsync sync, GLbitfield flags, GLuint64 timeout);
+	GLAPI PFNGLCLIENTWAITSYNCPROC glClientWaitSync;
+
+	typedef void (APIENTRYP PFNGLDELETESYNCPROC)(GLsync sync);
+	GLAPI PFNGLDELETESYNCPROC glDeleteSync;
+
+	#define GL_DEPTH24_STENCIL8               0x88F0
+	#define GL_MAP_PERSISTENT_BIT             0x0040
+	#define GL_MAP_READ_BIT                   0x0001
+	#define GL_MAP_WRITE_BIT                  0x0002
+	#define GL_MAP_UNSYNCHRONIZED_BIT         0x0020
+	#define GL_MAP_INVALIDATE_BUFFER_BIT      0x0008
+	#define GL_BGRA                           0x80E1
+	#define GL_DEPTH_CLAMP                    0x864F
+	#define GL_TEXTURE_MAX_ANISOTROPY_EXT     0x84FE
+	#define GL_INT_2_10_10_10_REV             0x8D9F
+	#define GL_RED                            0x1903
+	#define GL_TEXTURE_SWIZZLE_RGBA           0x8E46
+	#define GL_SYNC_GPU_COMMANDS_COMPLETE     0x9117
+	#define GL_SYNC_FLUSH_COMMANDS_BIT        0x00000001
+	#define GL_ALREADY_SIGNALED               0x911A
+	#define GL_CONDITION_SATISFIED            0x911C
+
 #else
 	#include "gl_load/gl_load.h"
 #endif
@@ -66,6 +81,13 @@ GLAPI PFNGLVERTEXATTRIBIPOINTERPROC glVertexAttribIPointer;
 
 namespace OpenGLESRenderer
 {
+	enum 
+	{
+		GLES_MODE_GLES = 0,
+		GLES_MODE_OGL2 = 1,
+		GLES_MODE_OGL3 = 2,
+	};
+
 	struct RenderContextGLES
 	{
 		unsigned int flags;
@@ -77,7 +99,7 @@ namespace OpenGLESRenderer
 		bool forceGLSLv100;
 		bool depthClampAvailable;
 		bool anistropicFilterAvailable;
-		bool gles3Features;
+		int glesMode;
 		const char* shaderVersionString;
 		int max_texturesize;
 		char* vendorstring;
-- 
2.39.3