- fixed: Camera textures must always be drawn with texture mode opaque, because the contents of their alpha channels are undefined.

src/gl/compatibility/gl_20.cpp

@@ -209,9 +209,10 @@ static bool currentModelMatrixState;
 
 void FRenderState::ApplyFixedFunction()
 {
-	if (mTextureMode != ffTextureMode)
+	int thistm = mTextureMode == TM_MODULATE && mTempTM == TM_OPAQUE ? TM_OPAQUE : mTextureMode;
+	if (thistm != ffTextureMode)
 	{
-		ffTextureMode = mTextureMode;
+		ffTextureMode = thistm;
 		if (ffTextureMode == TM_CLAMPY) ffTextureMode = TM_MODULATE;	// this cannot be replicated. Too bad if it creates visual artifacts
 		gl_SetTextureMode(ffTextureMode);
 	}

src/gl/renderer/gl_2ddrawer.cpp

@@ -405,7 +405,6 @@ void F2DDrawer::Draw()
 
 			gl_SetRenderStyle(dt->mRenderStyle, !dt->mMasked, false);
 			gl_RenderState.SetMaterial(dt->mTexture, CLAMP_XY_NOMIP, dt->mTranslation, -1, dt->mAlphaTexture);
-			if (dt->mTexture->tex->bHasCanvas) gl_RenderState.SetTextureMode(TM_OPAQUE);
 
 			glEnable(GL_SCISSOR_TEST);
 			glScissor(dt->mScissor[0], dt->mScissor[1], dt->mScissor[2], dt->mScissor[3]);

src/gl/renderer/gl_renderstate.cpp

@@ -164,7 +164,7 @@ bool FRenderState::ApplyShader()
 	activeShader->muFogEnabled.Set(fogset);
 	activeShader->muPalLightLevels.Set(static_cast<int>(gl_bandedswlight) | (static_cast<int>(gl_fogmode) << 8));
 	activeShader->muGlobVis.Set(GLRenderer->mGlobVis / 32.0f);
-	activeShader->muTextureMode.Set(mTextureMode);
+	activeShader->muTextureMode.Set(mTextureMode == TM_MODULATE && mTempTM == TM_OPAQUE ? TM_OPAQUE : mTextureMode);
 	activeShader->muCameraPos.Set(mCameraPos.vec);
 	activeShader->muLightParms.Set(mLightParms);
 	activeShader->muFogColor.Set(mFogColor);

src/gl/renderer/gl_renderstate.h

@@ -112,6 +112,7 @@ class FRenderState
 
 	int mEffectState;
 	int mColormapState;
+	int mTempTM = TM_MODULATE;
 
 	float stAlphaThreshold;
 	int stSrcBlend, stDstBlend;
@@ -150,6 +151,14 @@ public:
 		{
 			if (mat->tex->UseBasePalette() || gl.legacyMode) translation = TRANSLATION(TRANSLATION_Standard, 8);
 		}
+		if (mat->tex->bHasCanvas)
+		{
+			mTempTM = TM_OPAQUE;
+		}
+		else
+		{
+			mTempTM = TM_MODULATE;
+		}
 		mEffectState = overrideshader >= 0? overrideshader : mat->mShaderIndex;
 		mShaderTimer = mat->tex->gl_info.shaderspeed;
 		mat->Bind(clampmode, translation);