From a01c88707d7bc27c3ffa3a6d977e98a1f9c1f197 Mon Sep 17 00:00:00 2001
From: myT <>
Date: Fri, 29 Mar 2024 04:05:35 +0100
Subject: [PATCH] parsing the q3map_sun[Ext] shader directives

---
 code/renderer/tr_bsp.cpp    |  1 +
 code/renderer/tr_local.h    |  7 +++++++
 code/renderer/tr_shader.cpp | 35 +++++++++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+)

diff --git a/code/renderer/tr_bsp.cpp b/code/renderer/tr_bsp.cpp
index d773783..b6f5d4d 100644
--- a/code/renderer/tr_bsp.cpp
+++ b/code/renderer/tr_bsp.cpp
@@ -1499,6 +1499,7 @@ static void R_LoadFogs( const lump_t* l, const lump_t* brushesLump, const lump_t
 
 		// get information from the shader for fog parameters
 		shader_t* shader = R_FindShader( fogs->shader, LIGHTMAP_NONE, FINDSHADER_MIPRAWIMAGE_BIT );
+		shader->isFog = qtrue;
 
 		out->parms = shader->fogParms;
 
diff --git a/code/renderer/tr_local.h b/code/renderer/tr_local.h
index 5e7d0cf..0812410 100644
--- a/code/renderer/tr_local.h
+++ b/code/renderer/tr_local.h
@@ -415,6 +415,12 @@ struct shader_t {
 	float dfInvDist;
 	float dfBias;
 
+	// Radiant sun information from the sky shader
+	qbool isSunDataValid;
+	vec3_t sunColor;
+	float sunAzimuth;
+	float sunInclination;
+
 	qbool greyscaleCTF;
 
 	// extra info for /shaderinfo
@@ -429,6 +435,7 @@ struct shader_t {
 	qbool isAlphaTestedOpaque;		// no alpha blending, first stage is alpha tested
 	qbool isDynamic;				// at least one vertex attribute must be generated on the fly
 	qbool hasLightmapStage;
+	qbool isFog;
 
 	pipeline_t pipelines[MAX_SHADER_STAGES];
 	int numPipelines;
diff --git a/code/renderer/tr_shader.cpp b/code/renderer/tr_shader.cpp
index b2b0e51..62dab03 100644
--- a/code/renderer/tr_shader.cpp
+++ b/code/renderer/tr_shader.cpp
@@ -1314,6 +1314,37 @@ static void ParseSurfaceParm( const char** text )
 }
 
 
+static qbool ParseFloat( float* out, const char** text, const char* commandName, int argIndex )
+{
+	const char* const token = COM_ParseExt( text, qfalse );
+	if ( token[0] == '\0' || sscanf( token, "%f", out ) != 1 ) {
+		ParserWarning( "invalid/missing %s argument #%d", commandName, argIndex );
+		return qfalse;
+	}
+
+	return qtrue;
+}
+
+
+// q3map_sun R G B intensity azimuth elevation
+// q3map_sunExt R G B intensity azimuth elevation shadow_degrees samples
+
+static void ParseSun( const char** text )
+{
+	float v[6];
+	for ( int i = 0; i < ARRAY_LEN( v ); i++ ) {
+		if ( !ParseFloat( &v[i], text, "q3map_sun", i + 1 ) ) {
+			return;
+		}
+	}
+
+	shader.isSunDataValid = qtrue;
+	VectorSet( shader.sunColor, v[0], v[1], v[2] );
+	shader.sunAzimuth = v[4];
+	shader.sunInclination = 90.0f - v[5];
+}
+
+
 // q3map_cnq3_depthFade <scale> <bias>
 
 static void ParseDepthFade( const char** text )
@@ -1407,6 +1438,10 @@ static qbool ParseShader( const char** text )
 			ParseDepthFade( text );
 			continue;
 		}
+		else if ( !Q_stricmp( token, "q3map_sun" ) || !Q_stricmp( token, "q3map_sunExt" ) ) {
+			ParseSun( text );
+			SkipRestOfLine( text );
+		}
 		// skip stuff that only the q3map needs
 		else if ( !Q_stricmpn( token, "q3map", 5 ) ) {
 			SkipRestOfLine( text );