Add resolution uniform for sprite and mesh shaders (#2031)

The landscape shader already has such a uniform.

src/graphics/C4DrawGL.cpp

@@ -203,6 +203,7 @@ bool CStdGL::PrepareSpriteShader(C4Shader& shader, const char* name, int ssc, C4
 	uniformNames[C4SSU_NormalMatrix] = "normalMatrix";
 	uniformNames[C4SSU_ClrMod] = "clrMod";
 	uniformNames[C4SSU_Gamma] = "gamma";
+	uniformNames[C4SSU_Resolution] = "resolution";
 	uniformNames[C4SSU_BaseTex] = "baseTex";
 	uniformNames[C4SSU_OverlayTex] = "overlayTex";
 	uniformNames[C4SSU_OverlayClr] = "overlayClr";
@@ -609,6 +610,10 @@ void CStdGL::PerformMultiBlt(C4Surface* sfcTarget, DrawOperation op, const C4Blt
 	assert(sfcTarget->IsRenderTarget());
 	if(!PrepareRendering(sfcTarget)) return;
 
+	// Set resolution. The other uniforms are set in SetupMultiBlt, but the
+	// surface size is still unknown there.
+	shader_call->SetUniform2f(C4SSU_Resolution, sfcTarget->Wdt, sfcTarget->Hgt);
+
 	// Select a buffer
 	const unsigned int vbo_index = CurrentVBO;
 	CurrentVBO = (CurrentVBO + 1) % N_GENERIC_VBOS;

src/graphics/C4DrawGL.h

@@ -55,6 +55,7 @@ enum C4SS_Uniforms
 
 	C4SSU_ClrMod, // always
 	C4SSU_Gamma, // always
+	C4SSU_Resolution, // always
 
 	C4SSU_BaseTex, // C4SSC_BASE
 	C4SSU_OverlayTex, // C4SSC_OVERLAY

src/graphics/C4DrawMeshGL.cpp

@@ -513,6 +513,7 @@ namespace
 		};
 		call.SetUniform4fv(C4SSU_ClrMod, 1, fMod);
 		call.SetUniform3fv(C4SSU_Gamma, 1, pDraw->gammaOut);
+		call.SetUniform2f(C4SSU_Resolution, outRect.Wdt, outRect.Hgt);
 
 		// Player color
 		const float fPlrClr[3] = {

src/lib/StdMeshMaterial.cpp

@@ -852,6 +852,7 @@ bool StdMeshMaterialProgram::CompileShader(StdMeshMaterialLoader& loader, C4Shad
 	uniformNames[C4SSU_NormalMatrix] = "normalMatrix";
 	uniformNames[C4SSU_ClrMod] = "clrMod";
 	uniformNames[C4SSU_Gamma] = "gamma";
+	uniformNames[C4SSU_Resolution] = "resolution";
 	uniformNames[C4SSU_BaseTex] = "baseTex"; // unused
 	uniformNames[C4SSU_OverlayTex] = "overlayTex"; // unused
 	uniformNames[C4SSU_OverlayClr] = "oc_PlayerColor";