From 895c7f1a06de2d89347909d62da41be9d62f0d09 Mon Sep 17 00:00:00 2001
From: jussi
Date: Wed, 12 Apr 2023 00:05:57 +0300
Subject: glBlitFramebuffer.

---
 src/gl.c       | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/lua_core.c | 17 +++++++++------
 2 files changed, 76 insertions(+), 6 deletions(-)
 create mode 100644 src/gl.c

(limited to 'src')

diff --git a/src/gl.c b/src/gl.c
new file mode 100644
index 0000000..18947d5
--- /dev/null
+++ b/src/gl.c
@@ -0,0 +1,65 @@
+#include "main.h"
+#include "state.h"
+#include "lua_core.h"
+#include "textures.h"
+#include "lgl.h"
+
+/*
+## OpenGL - Framebuffer management
+*/
+
+/*
+> success = RL.glBlitFramebuffer( RenderTexture srcTex, RenderTexture dstTex, Rectangle srcRect, Rectangle dstRect, int mask, int filter )
+
+Copy a block of pixels from one framebuffer object to another.
+Use -1 RenderTexture for window framebuffer.
+
+- Failure return false
+- Success return true
+*/
+int lglBlitFramebuffer( lua_State *L ) {
+	if ( !lua_isnumber( L, 1) || !lua_isnumber( L, 2 ) || !lua_istable( L, 3 )
+	|| !lua_istable( L, 4 )	|| !lua_isnumber( L, 5 ) || !lua_isnumber( L, 6 ) ) {
+		TraceLog( LOG_WARNING, "%s", "Bad call of function. RL.glBlitFramebuffer( RenderTexture srcTex, RenderTexture dstTex, Rectangle srcRect, Rectangle dstRect, int mask, int filter )" );
+		lua_pushboolean( L, false );
+		return 1;
+	}
+	int srcTexId = lua_tointeger( L, 1 );
+	int dstTexId = lua_tointeger( L, 2 );
+	Rectangle srcRect = uluaGetRectangleIndex( L, 3 );
+	Rectangle dstRect = uluaGetRectangleIndex( L, 4 );
+	int mask = lua_tointeger( L, 5 );
+	int filter = lua_tointeger( L, 6 );
+
+	if ( ( !validRenderTexture( srcTexId ) && srcTexId != -1 ) && ( !validRenderTexture( dstTexId ) && dstTexId != -1 ) ) {
+		lua_pushboolean( L, false );
+		return 1;
+	}
+
+	if ( srcTexId == -1 ) {
+		glBindFramebuffer( GL_READ_FRAMEBUFFER, 0 );
+	}
+	else {
+		glBindFramebuffer( GL_READ_FRAMEBUFFER, state->renderTextures[ srcTexId ]->id );
+	}
+
+	if ( dstTexId == -1 ) {
+		glBindFramebuffer( GL_DRAW_FRAMEBUFFER, 0 );
+	}
+	else {
+		glBindFramebuffer( GL_DRAW_FRAMEBUFFER, state->renderTextures[ dstTexId ]->id );
+	}
+
+	glBlitFramebuffer(
+		srcRect.x, srcRect.y, srcRect.width, srcRect.height,
+		dstRect.x, dstRect.y, dstRect.width, dstRect.height,
+		mask,
+		filter
+		// GL_COLOR_BUFFER_BIT, 									// mask
+		// GL_NEAREST												// filter
+	);
+
+	lua_pushboolean( L, true );
+
+	return 1;
+}
\ No newline at end of file
diff --git a/src/lua_core.c b/src/lua_core.c
index dae916e..3c839c6 100644
--- a/src/lua_core.c
+++ b/src/lua_core.c
@@ -11,6 +11,7 @@
 #include "rgui.h"
 #include "lights.h"
 #include "lrlgl.h"
+#include "lgl.h"
 #include "reasings.h"
 
 static void assignGlobalInt( int value, const char *name ) {
@@ -491,6 +492,12 @@ void defineGlobals() {
 	/* LightType */
 	assignGlobalInt( LIGHT_DIRECTIONAL, "LIGHT_DIRECTIONAL" );
 	assignGlobalInt( LIGHT_POINT, "LIGHT_POINT" );
+	/* OpenGL */
+	assignGlobalInt( GL_COLOR_BUFFER_BIT, "GL_COLOR_BUFFER_BIT" );
+	assignGlobalInt( GL_DEPTH_BUFFER_BIT, "GL_DEPTH_BUFFER_BIT" );
+	assignGlobalInt( GL_STENCIL_BUFFER_BIT, "GL_STENCIL_BUFFER_BIT" );
+	assignGlobalInt( GL_NEAREST, "GL_NEAREST" );
+	assignGlobalInt( GL_LINEAR, "GL_LINEAR" );
 /*DOC_END*/
 
 	lua_pop( L, -1 );
@@ -999,10 +1006,8 @@ void luaRegister() {
 		/* Texture Drawing. */
 	assingGlobalFunction( "DrawTexture", ltexturesDrawTexture );
 	assingGlobalFunction( "DrawTextureRec", ltexturesDrawTextureRec );
-	// assingGlobalFunction( "DrawTextureTiled", ltexturesDrawTextureTiled );
 	assingGlobalFunction( "DrawTexturePro", ltexturesDrawTexturePro );
 	assingGlobalFunction( "DrawTextureNPatch", ltexturesDrawTextureNPatch );
-	// assingGlobalFunction( "DrawTexturePoly", ltexturesDrawTexturePoly );
 	assingGlobalFunction( "BeginTextureMode", ltexturesBeginTextureMode );
 	assingGlobalFunction( "EndTextureMode", ltexturesEndTextureMode );
 	assingGlobalFunction( "SetTextureSource", ltexturesSetTextureSource );
@@ -1038,7 +1043,6 @@ void luaRegister() {
 	assingGlobalFunction( "DrawTriangle3D", lmodelsDrawTriangle3D );
 	assingGlobalFunction( "DrawCube", lmodelsDrawCube );
 	assingGlobalFunction( "DrawCubeWires", lmodelsDrawCubeWires );
-	// assingGlobalFunction( "DrawCubeTexture", lmodelsDrawCubeTexture );
 	assingGlobalFunction( "DrawSphere", lmodelsDrawSphere );
 	assingGlobalFunction( "DrawSphereEx", lmodelsDrawSphereEx );
 	assingGlobalFunction( "DrawSphereWires", lmodelsDrawSphereWires );
@@ -1138,9 +1142,6 @@ void luaRegister() {
 	assingGlobalFunction( "StopSound", laudioStopSound );
 	assingGlobalFunction( "PauseSound", laudioPauseSound );
 	assingGlobalFunction( "ResumeSound", laudioResumeSound );
-	// assingGlobalFunction( "PlaySoundMulti", laudioPlaySoundMulti );
-	// assingGlobalFunction( "StopSoundMulti", laudioStopSoundMulti );
-	// assingGlobalFunction( "GetSoundsPlaying", laudioGetSoundsPlaying );
 	assingGlobalFunction( "IsSoundPlaying", laudioIsSoundPlaying );
 	assingGlobalFunction( "SetSoundVolume", laudioSetSoundVolume );
 	assingGlobalFunction( "SetSoundPitch", laudioSetSoundPitch );
@@ -1347,6 +1348,10 @@ void luaRegister() {
 	assingGlobalFunction( "rlglSetLineWidth", lrlglSetLineWidth );
 	assingGlobalFunction( "rlglGetLineWidth", lrlglGetLineWidth );
 
+	/* OpenGL */
+		/* Framebuffer management. */
+	assingGlobalFunction( "glBlitFramebuffer", lglBlitFramebuffer );
+
 	/* Easings */
 		/* Linear Easing functions. */
 	assingGlobalFunction( "EaseLinear", leasingsEaseLinear );
-- 
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