Make rend2 build and work on linux

codemp/rd-rend2/tr_bsp.cpp

@@ -30,6 +30,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "tr_cache.h"
 #include <vector>
 
+#include <cmath>
+
 /*
 
 Loads and prepares a map file for scene rendering.
@@ -3575,7 +3577,7 @@ static std::vector<sprite_t> R_CreateSurfaceSpritesVertexData(
 		const vec2_t p01 = {p1[0] - p0[0], p1[1] - p0[1]};
 		const vec2_t p02 = {p2[0] - p0[0], p2[1] - p0[1]};
 
-		const float zarea = std::fabsf(p02[0]*p01[1] - p02[1]*p01[0]);
+		const float zarea = std::fabs(p02[0]*p01[1] - p02[1]*p01[0]);
 		if ( zarea <= 1.0 )
 		{
 			// Triangle's area is too small to consider.
@@ -3610,7 +3612,7 @@ static std::vector<sprite_t> R_CreateSurfaceSpritesVertexData(
 				// => y*y = 1.0 - x*x
 				// => y = -/+sqrt(1.0 - x*x)
 				float nx = flrand(-1.0f, 1.0f);
-				float ny = std::sqrtf(1.0f - nx*nx);
+				float ny = std::sqrt(1.0f - nx*nx);
 				ny *= irand(0, 1) ? -1 : 1;
 
 				VectorSet(sprite.normal, nx, ny, 0.0f);

codemp/rd-rend2/tr_extensions.cpp

@@ -256,7 +256,8 @@ static qboolean GetGLFunction ( GLFuncType& glFunction, const char *glFunctionSt
 	return qtrue;
 }
 
-static void __stdcall GLimp_OnError(GLenum source, GLenum type, GLuint id, GLenum severity,
+
+static void QCALL GLimp_OnError(GLenum source, GLenum type, GLuint id, GLenum severity,
 									GLsizei length, const GLchar *message, const void *userParam)
 {
 	const char *severityText = "";

codemp/rd-rend2/tr_ghoul2.cpp

@@ -3954,8 +3954,8 @@ qboolean R_LoadMDXM(model_t *mod, void *buffer, const char *mod_name, qboolean &
 		CModelCache->StoreShaderRequest(mod_name, &surfInfo->shader[0], &surfInfo->shaderIndex);		
 
 		// find the next surface
-		surfInfo = (mdxmSurfHierarchy_t *)( (byte *)surfInfo + offsetof (mdxmSurfHierarchy_t, childIndexes[surfInfo->numChildren]) );
-  	}
+		surfInfo = (mdxmSurfHierarchy_t *)((byte *)surfInfo + offsetof(mdxmSurfHierarchy_t, childIndexes) + sizeof(int) * surfInfo->numChildren);
+	}
 
 	// swap all the LOD's	(we need to do the middle part of this even for intel, because of shader reg and err-check)
 	lod = (mdxmLOD_t *) ( (byte *)mdxm + mdxm->ofsLODs );

codemp/rd-rend2/tr_glsl.cpp

@@ -371,7 +371,7 @@ static size_t GLSL_GetShaderHeader(
 	// OK we added a lot of stuff but if we do something bad in the GLSL
 	// shaders then we want the proper line so we have to reset the line
 	// counting
-	Q_strcat(dest, size, va("#line %d\n", firstLineNumber - 1));
+	Q_strcat(dest, size, va("\n#line %d\n", firstLineNumber - 1));
 
 	return strlen(dest);
 }

codemp/rd-rend2/tr_glsl_parse.cpp

@@ -41,7 +41,8 @@ Block *FindBlock( const char *name, Block *blocks, size_t numBlocks )
 	return nullptr;
 }
 
-#if defined(__clang__)
+// [M] strncpy_s is not present on linux and VS only function
+#if !defined(_WIN32)
 void strncpy_s( char *dest, size_t destSize, const char *src, size_t srcSize )
 {
 	// This isn't really a safe version, but I know the inputs to expect.
@@ -52,6 +53,7 @@ void strncpy_s( char *dest, size_t destSize, const char *src, size_t srcSize )
 }
 #endif
 
+
 }
 
 GPUProgramDesc ParseProgramSource( Allocator& allocator, const char *text )

codemp/rd-rend2/tr_weather.cpp

@@ -22,6 +22,8 @@ along with this program; if not, see <http://www.gnu.org/licenses/>.
 #include "tr_local.h"
 #include <utility>
 #include <vector>
+#include <cmath>
+
 
 struct weatherSystem_t
 {